N-Acetyl L-Cysteine (NAC or N-acetylcysteine) is the N-acetyl derivative of the naturally occurring amino acid L-cysteine. And works primarily by helping restore the body’s natural antioxidant glutathione (γ-glutamylcysteinylglycine; GSH).
As the most abundant antioxidant in your body, GSH is responsible for maintaining oxidative balance in each of your cells.
Taking glutathione as a nootropic supplement does not adequately restore GSH levels in your brain because it can’t cross the blood-brain barrier. This vastly underrated nootropic, NAC easily penetrates the blood-brain barrier and raises glutathione levels in your brain.[i]
NAC has been used to treat acetaminophen poisoning for decades.[ii] Every year there are 56,000 ER visits from Tylenol overdose, resulting in at least 100 deaths. [iii] NAC provides the glutathione your liver needs to fight off the metabolite NAPQI in Tylenol that does severe liver damage.
As a nootropic, NAC helps prevent glutamate toxicity, boosts dopamine, and reduces inflammation, oxidative and free radical damage.
Where to buy: one of the only vendors still selling NAC and I highly recommend them: Life Extension – NAC
N-Acetyl L-Cysteine helps:
- Neuroprotection. NAC as a precursor of glutathione, is a potent antioxidant, anti-inflammatory and free radical scavenger.[iv] Your brain is especially vulnerable to inflammation, free radical and oxidative damage. Affecting cognition, long-term potentiation, memory and mood.
- Neurotransmitters. NAC modulates glutamate levels and dopamine release in the brain. Excess glutamate in your brain is toxic to brain cells affecting neuron health, cognition, memory and mood. And NAC protects dopamine receptors. Influencing dopamine levels and function in your brain. Even protecting dopaminergic nerve terminals from chronic methamphetamine use.[v]
- Anxiety and depression. NAC reduces irritability, anxiety and depression. NAC increases your body’s antioxidant capacity, and balances excitatory and inhibitory neurotransmitters in your brain. Resulting in less anxiety and depression.
Table of Contents
Overview
N-Acetyl L-Cysteine (NAC) is the N-acetyl form of the naturally occurring amino acid L-Cysteine.
L-Cysteine is naturally produced in your body using the amino acid methionine. You can also get L-Cysteine from eating ricotta and cottage cheese, yogurt, pork, chicken, turkey, duck, wheat germ, granola and oat flakes.
But acute stress, illness, or a poor diet can deplete L-Cysteine levels in your body and brain. The quickest and most efficient way to boost levels of L-Cysteine is to supplement with N-Acetyl L-Cysteine (NAC).
NAC regulates the amount of glutamate in your brain. Glutamate is a neurotransmitter that is responsible for sending signals between neurons in the brain. This plays an important role in learning and forming memories.
But too much glutamate can be toxic to brain cells. NAC regulates the amount of glutamate and keeps it at safe, healthy levels.
NAC influences the amount of dopamine available in your brain. It works to keep dopamine receptors healthy and able to transmit and receive dopamine. These neurotransmitters are crucial for cognitive energy and drive, motor control, feelings of pleasure, and focus.
NAC is a precursor to the powerful anti-oxidant glutathione (GSH). GSH is a potent anti-inflammatory, anti-oxidant and free radical scavenger.
Your brain is especially vulnerable to inflammation, free radical and oxidative damage. If left unchecked, inflammation, oxidation and free radicals can negatively affect cognition, long-term potentiation, memory and mood.
As a nootropic, NAC can boost glutathione and dopamine levels in your brain. NAC is also used by medical professionals to treat serious cognitive disorders like schizophrenia, bipolar disorder, severe depression and anxiety.
How does N-Acetyl L-Cysteine work in the Brain?
N-Acetyl L-Cysteine boosts brain health and function in several ways. But two in particular stand out.
- N-Acetyl L-Cysteine reduces oxidative stress. Oxidative stress results in free radical damage in brain cells. Leading to neurodegeneration and ultimately Alzheimer’s, Parkinson’s and other age-related neuronal disorders. Proteins and DNA are injured, inflammation, tissue damage and cellular apoptosis (cell death) are the result.
And neurohackers are not immune to oxidative stress no matter what your age. Keep this in mind the next time you reach for a Diet Coke. Consumption of the artificial sweetener aspartame induces cortical inflammation and oxidative stress.
Researchers did a study with 30 adult male Wistar rats randomly divided into 3 groups. The control group received distilled water. The second group was given aspartame. And the third group was given aspartame and NAC. Oral administration was done in the morning daily for 90 days.
The study found that NAC affected Brain-Derived Neurotrophic Factor (BDNF) levels, blocked the COX-2 and PGE2 inflammatory enzymes, and reduced the expression of interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) inflammatory cytokines in the rat cerebral cortex. They also found that NAC replenished glutathione levels.
The researchers concluded that NAC prevented neurotoxicity and improved neurological function, suppressed brain inflammation, and oxidative stress response.[vi]
- N-Acetyl L-Cysteine relieves depression. Major depressive disorder is one of the most common psychiatric disorders. It’s a burden on the individual, family and the community. And the pharmaceutical companies are making literally billions on selling various anti-depressants. Not treating the cause, producing a host of side effects, and in most cases just ‘dumbing down’ the symptoms.
But the pipeline for new anti-depressant drug discovery is at a near stand-still for treating problems like schizophrenia, bipolar disorder, depression and common forms of autism.
The good news is that neuroscience continues to work on the problem. And have shown that many of these disorders share inflammation and oxidative stress as part of their disease physiology.
Neuroscientists also discovered that associated pathways causing these diseases include a reduction in proteins that stimulate neuron growth (neurotrophins), increased apoptosis (cell death), and reduced energy generation in mitochondria.
It turns out that NAC seems to have multiple effects on all these pathways. NAC reduces the core symptoms of schizophrenia, reduces depression, and reduces cravings for a number of addictions including cocaine, cannabis and tobacco.[vii]
How things go bad
As we get older or suffer from chronic illness, our brain and body chemistry and energy metabolism changes.
↑ Oxidative stress in brain cells increase
↓ Free radicals damage neurons
↓ Dopamine receptors stop working
↑ Glutamate toxicity causes cell damage and apoptosis
↓ Brain-Derived Neurotrophic Factor (BDNF) declines
↓ Mitochondria energy declines
All of these changes are often attributed to chronic illness, lifestyle choices, and aging.
Unchecked, they could lead to neurodegenerative diseases like Parkinson’s, Alzheimer’s, major depression, schizophrenia, OCD, addictions, autism, and a drop in quality of life.
N-Acetyl L-Cysteine benefits
N-Acetyl L-Cysteine (NAC) is a slightly modified version of the sulfur-containing amino acid L-Cysteine. When taken as a supplement, NAC replenishes intracellular levels of the natural antioxidant glutathione (GSH). Restoring your cells’ ability to fight damage from reactive oxygen species (ROS).
Conventional medicine has used NAC for decades as an inhaled mucous thinner to treat symptoms of cystic fibrosis. NAC is given intravenously (IV) or orally as a treatment for acute acetaminophen poisoning. NAC quickly restores glutathione levels, averting permanent disability or death.
The nootropics community has recently discovered NAC as a way to suppress inflammation in the brain. NAC prevents oxidative stress on brain cells, eliminates free radicals, restores Brain-Derived Neurotrophic Factor (BDNF), rejuvenates dopamine receptors, and improves overall cognitive function.
NAC can help boost cognition, Long-Term Potentiation for long-term memory formation, short-term and working memory, improve your mood and quell anxiety.
How does N-Acetyl L-Cysteine feel?
Neurohackers report that supplementing with NAC could be the best nootropic they’ve ever used for their brain and overall health. Comments include:
- Thinking is clearer (less brain fog)
- Memory improves
- Concentration and attention improves
- Less anxiety
- Less depression
- Less irritable
- Mood improves (like a ‘clean high’)
- Symptoms caused by ADHD meds disappear
- Obsessive Compulsive behavior decreases
- Sleep quality improves
- Energy levels increase
- Weight maintenance is easier
- Less flu and colds
- Skin looks better
- Feel younger
- Hangovers are less severe
N-Acetyl L-Cysteine Clinical Research
N-Acetyl L-Cysteine increases dopamine
Treatments for Parkinson’s Disease are limited to replacing dopamine in the brain. As well as some medications designed to slow down the disease.
In 2016, researchers at Thomas Jefferson University showed that oxidative stress in the brain could play a critical role in the progression of Parkinson’s. And this stress lowers levels of glutathione, a compound produced in the brain to counteract oxidative stress.
Studies show that N-Acetyl L-Cysteine (NAC) helps reduce oxidative damage to neurons by helping restore the levels of the antioxidant glutathione.
In this study, Parkinson’s patients were placed into two groups. The first group received 50 mg/kg NAC intravenously (IV) once per week. And 600 mg of NAC as a supplement twice a day on non-IV days.
The second (control) group received only their standard Parkinson’s treatment. Patients were evaluated at the beginning of the study and again 3 months later.
The evaluation consisted of the Unified Parkinson’s Disease Rating Scale (UPDRS), and a SPECT brain scan which measures the amount of dopamine transporter in the brain.
Compared to controls, the patients receiving NAC had significant improvements in their scores. One of the study authors said, “We have not previously seen an intervention for Parkinson’s disease have this kind of effect on the brain”. This study demonstrated for the first time the direct effect of NAC on the brain’s dopamine system. NAC has the unique ability to enable dopamine neurons to recover their function.[viii]
N-Acetyl L-Cysteine repairs Traumatic Brain Injury
Traumatic brain injury (TBI) is a major public health issue affecting 1.7 million Americans each year.[ix] TBI can be caused by sports injuries, work accidents, car and motorcycle accidents, falls, and your wife hitting you over the head with a frying pan.
Many survivors end up with long-term or even permanent neurocognitive dysfunction. Affecting cognition, motor function (movement) and personality. These disabilities are estimated to cost $9.2 billion in lifetime medical costs and $51.2 billion in productivity losses.[x]
A major cause of TBI comes from blast exposure on the battlefield. Symptoms are similar to other causes of TBI; dizziness, hearing loss, headache, memory loss, sleep issues, and neurocognitive dysfunction.
In a brain subjected to TBI there is glutamate toxicity, free-radical injury to brain cells, electrolyte imbalances, mitochondrial dysfunction, inflammation, apoptosis (cell death) and stroke.[xi][xii]
This double blind, placebo-controlled study was conducted with 81 active duty service members at a forward deployed field hospital in Iraq. All service members in this study were exposed to significant ordinance blast and met the criteria for TBI.
Service members were randomly assigned to receive either a placebo or N-Acetyl L-Cysteine (NAC) for 7 days. The resolution after 7 days of all the TBI symptoms listed above was the main outcome measure of this study.
The researchers concluded that NAC was a safe pharmaceutical countermeasure of blast-induced TBI. And that further work on long term outcomes and the potential use of NAC in civilian TBI is warranted.[xiii]
N-Acetyl L-Cysteine helps alleviate depression
Both depression and bipolar disorder are complicated by glutathione depletion. The researchers in this double-blind, multicenter, placebo-controlled study worked with 75 subjects with bipolar disorder.
Subjects received 1 gram of NAC twice daily for 24 weeks. NAC treatment caused a significant improvement with depression with those using NAC.
The researchers concluded, “NAC appears a safe and effective augmentation strategy for depressive symptoms”. In this case with people suffering from bipolar disorder.[xiv]
N-Acetyl L-Cysteine Recommended Dosage
N-Acetyl L-Cysteine (NAC) suggested dosage for cognitive benefit is 500 mg 3-times per day.
Clinical studies have found that doses up to 2,000 mg per day are safe and effective.
And one German study showed the safety of 2,800 mg per day for 3 months in patients with cystic fibrosis.[xv]
NAC has also proven effective against seasonal influenza and flu-like illnesses. One large study of older adults in Italy took 600 mg of NAC twice daily for 6 months. Only 25% of those adults who used NAC experienced flu-like episodes compared to 79% in the placebo group.[xvi]
N-Acetyl L-Cysteine Side Effects
N-Acetyl L-Cysteine (NAC) is the N-acetyl form of the naturally occurring amino acid L-Cysteine. NAC is considered non-toxic and very safe.
NAC is a slightly modified version of the sulfur-containing amino acid L-Cysteine. So NAC in powder form can have an unpleasant smell.
Very rarely can NAC cause nausea, vomiting, diarrhea or constipation. Even more rare are rashes, fever, headache, drowsiness, low blood pressure and liver problems.
Side effects can be a result of very high doses of NAC. And if you have a genetic condition called Cystinuria do not use NAC. This rare condition causes stones to form in the kidneys, ureter and bladder from cysteine. NAC is the N-Acetyl form of Cysteine.
One study has also found that long-term use of high-dose NAC can deplete your body’s stores of zinc. So if you are using NAC everyday you should also supplement with zinc and low dose copper.
Where to buy N-Acetyl L-Cysteine
N-Acetyl L-Cysteine (NAC) is available in powder, tablet and capsule form. NAC capsules and tablets were usually 500 mg.
Where to buy: I highly recommend: Life Extension – NAC
NAC is in short supply because on July 23, 2020, the FDA sent a warning letter to Purple Biosciences LLC about its NAC product. And asserted that NAC was illegally sold as a dietary supplement because it was approved as a drug September 14, 1963. Several other letters were sent to supplement manufacturers. Since then NAC was difficult to find on Amazon or many of the other sites that used to sell NAC.
Several lawsuits were filed against the FDA. And NAC has since become easier to find in the supplements sections of online stores.
Nootropics Expert Recommendation
N-Acetyl L-Cysteine (NAC) 500 mg, 3-times per day
I highly recommend using N-Acetyl L-Cysteine (NAC) as a nootropic supplement.
Your body does synthesize some L-Cysteine from methionine. And you can get L-Cysteine from foods such as dairy, poultry, pork, and some grains and nuts.
But most of us don’t get enough N-Acetyl L-Cysteine from our diet. So supplementation will help. And N-Acetyl L-Cysteine is a highly bioavailable form of L-Cysteine. So you should feel its effects faster.
NAC is helpful for most neurohackers to improve mood, memory, cognition, and concentration. And NAC helps alleviate brain fog, anxiety, and irritability.
NAC is especially helpful to those dealing with Obsessive Compulsive Disorder. And stacked with ADHD meds, NAC helps alleviate some of the negative side effects associated with stimulants.
If you can still find it, you can safely use up to 1,800 mg of NAC per day. The usual dose for cognitive improvement is 500 mg dosed 3 times throughout your day.
I recommend N-Acetyl L-Cysteine (NAC) from : Life Extension – NAC
[i] Neuwelt E.A., Pagel M.A., Hasler B.P., Deloughery T.G., Muldoon L.L. “Therapeutic efficacy of aortic administration of N-acetylcysteine as a chemoprotectant against bone marrow toxicity after intracarotid administration of alkylators, with or without glutathione depletion in a rat model.” Cancer Research. 2001 Nov 1;61(21):7868-74 (source)
[ii] Scalley R.D., Conner C.S. “Acetaminophen poisoning: a case report of the use of acetylcysteine.” American Journal of Hospital Pharmacy. 1978 Aug;35(8):964-7. (source)
[iii] Neergaard L. “Most Popular painkiller is lead cause of acute liver failure” National AIDS Treatment Advocacy Project natap.org Dec. 25, 2005 retrieved June 17, 2016 (source)
[iv] Eakin K., et. Al. “Efficacy of N-Acetyl Cysteine in Traumatic Brain Injury” PLoS One. 2014; 9(4): e90617. (source)
[v] Hashimoto K., Tsukada H., Nishiyama S., Fukumoto D., Kakiuchi T., Shimizu E., Iyo M. “Effects of N-acetyl-L-cysteine on the reduction of brain dopamine transporters in monkey treated with methamphetamine.” Annals of the New York Academy of Sciences. 2004 Oct;1025:231-5. (source)
[vi] Saleh A.A.S. “Anti-neuroinflammatory and antioxidant effects of N-acetyl cysteine in long-term consumption of artificial sweetener aspartame in the rat cerebral cortex” The Journal of Basic & Applied Zoology Volume 72, October 2015, Pages 73–80 (source)
[vii] European College of Neuropsychopharmacology (ECNP). “Amino acid offers potential therapeutic alternative in psychiatric disorders.” Science Newsline Medicine sciencenewsline.com October 7, 2013 Retrieved June 18, 2016 (source)
[viii] Monti D.A., Zabrecky G., Kremens D., Lian T.W., Wintering N.A., Cai J., Wei X., Bazzan A.J., Zhong L., Bowen B., Intenzo C.M., Iacovitti L., Newberg A.B. “N-Acetyl Cysteine May Support Dopamine Neurons in Parkinson’s Disease: Preliminary Clinical and Cell Line Data.” PLOS ONE, 2016; 11 (6): e0157602 (source)
[ix] Faul M, Xu L, Wald MM, Coronado VG (2010) “Traumatic Brain Injury in the United States: Emergency Department Visits, Hospitalizations and Deaths 2002–2006”. Atlanta (GA): Centers for Disease Control and Prevention, National Center for Injury Prevention and Control. (source)
[x] Rutland-Brown W., Langlois J.A., Thomas K.E., Xi Y.L. “Incidence of traumatic brain injury in the United States, 2003.” Journal of Head Trauma Rehabilitation. 2006 Nov- Dec;21(6):544-8. (source)
[xi] Yi J.H., Hazell A.S. “Excitotoxic mechanisms and the role of astrocytic glutamate transporters in traumatic brain injury.”Neurochemistry International. 2006 Apr;48(5):394-403 (source)
[xii] Farkas O., Povlishock J.T. “Cellular and subcellular change evoked by diffuse traumatic brain injury: a complex web of change extending far beyond focal damage.” Progress in Brain Research. 2007;161:43-59. (source)
[xiii] Hoffer M.E., Balaban C., Slade M.D., Tsao J.W., Hoffer B. “Amelioration of acute sequelae of blast induced mild traumatic brain injury by N-acetyl cysteine: a double-blind, placebo controlled study.”PLoS One. 2013;8(1):e54163. (source)
[xiv] Berk M., Copolov D.L., Dean O., Lu K., Jeavons S, Schapkaitz I., Anderson-Hunt M., Bush A.I. “N-acetyl cysteine for depressive symptoms in bipolar disorder–a double-blind randomized placebo-controlled trial.” Biological Psychiatry. 2008 Sep 15;64(6):468-75 (source)
[xv] Dauletbaev N., Fischer P., Aulbach B., Gross J., Kusche W., Thyroff-Friesinger U., Wagner T.O., Bargon J. “A phase II study on safety and efficacy of high-dose N-acetylcysteine in patients with cystic fibrosis.” European Journal of Medical Research. 2009 Aug 12;14(8):352-8. (source)
[xvi] De Flora S., Grassi C., Carati L. “Attenuation of influenza-like symptomatology and improvement of cell-mediated immunity with long-term N-acetyl cysteine treatment”. The European Respiratory Journal. 1997 Jul;10(7):1535-41. (source)
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Hi David
I have been taking NAC for a few years now and I was doing well.
It has helped me with attention, concentration, memory, and in general executive functions. My life has got a way better while on it. Unfortunately I have heard that it is banned from the FDA. Is that true? How can we get now? I do not feel that i can function without it 🙁
Marya, scroll back up to the last section of my review above called “Where to buy N-Acetyl L-Cysteine“. There is a link there where you can buy NAC and the last couple of paragraphs explains what is going on with the FDA.
Hi David! I used NAC for 10 days , first few days my anxiety & stress was gone but now when I take nac , it gives me headache , I don’t know why it happen. Can you please recommend any alternative which I can take instead of NAC . Thanks
Malik, the only alternative to NAC is glutathione: https://nootropicsexpert.com/glutathione/
Hi, sorry about my english. I heard that NAC with Taurine can help with sleep problems. I am taking L-tryptophan with magnesium and Theanine before bed. Is it ok if I add Taurine and NAC?
Thank you.
Tatiana, your English is fine. Yes, it is OK to use either or both of those supplements. But try them one at a time and see how and if it works for you.
Hi David! Does Nac lowers testosterone & increase estrogen? Is that true . Thanks
NAC does not lower testosterone or increase estrogen. But long-term use can deplete zinc stores in your body which could have an effect on testosterone. If you plan on using NAC long-term you should supplement with zinc and 1.5 mg of copper.
Hi David ! Can I combine NAC with aniracetam & ashwagandha . thanks
Malik, yes you can combine them. Just make sure you also use Alpha GPC or CDP-Choline if you are using Aniracetam to get the most benefit.
hi david
for my adult OCD, can i take :
1- N-Acetyl Cysteine 1000mg, two times per day
2- L-Theanine 200 mg, one time per day
3- glycine 1000mg per day
and what best time to take each one ?
Salem,
1. NAC 500 mg 3-times per day
2. L-Theanine 100 mg 3-times per day
3. L-Glycine 1000 mg before bed
And by 3-times per day I mean morning, noon and late afternoon.
hi david
i only found 600 mg of NAC, not the 500 mg
can i take 600mg three times a days?
thats 1800mg daily
Salem, my dosage recommendation for NAC used to be 600 mg 3-times per day until I could not find 600 mg capsules here in the USA since the FDA is trying to ban it from the supplement market. So yes, 600 mg is even better than 500 mg per dose.
Why is the FDA trying to ban NAC?
Ron, scroll up to the section “Where to buy N-Acetyl L-Cysteine” and see the last two paragraphs of that section.
Is it safe to take NAC with Eliquis (blood thinner) ?
Yes
Hi David – going through all your brilliant reviews. It would seem inositol (3 times a day) and NAC (3 times a day) are good for OCD coupled in with ltrytophan ( once at night -seretonin production) and L-Tyrosine (twice a day dopamine production). Is taking four amino acids every day – many several times -too much?
Tom, use any many amino acids as you need to get the job done. At times they may compete for transporters but enough will get through to get the job done as long as you follow dosage recommendations.
I wonder how NAC would work with ADHD stimulants?
NAC considered one of the best supplements for ADHD, though there are rumors that NAC lowers/cancels Ritalin. As NAC tries to balance/detox the brain.
David, you had experience with both, how do you take (took) these two medications?
And how long one should take NAC before seeing benefits?
Should I stop taking NAC after the Covid vaccination or keep taking it?
Andrew, I’ve been using NAC for years every single day. Long before COVID showed up. And I’ll personally continue to use it because it is one of the most powerful ways to naturally boost your immune system. I manage to stay healthy when others around me are dealing with the flu or a cold.
First I would like to say that you’re a treasure of information of the most importance.
Can i use NAC with ssri/benzo/antipsychotics?
Doctor gave me antipsychotics for my ocd, to lower dopamine, they say Lowering dopamine helps with ocd. But NAC increases dopamine i read here. And does it actually lower glutamate when i take 500mg three times a day?
Ty much
Shaun, NAC does not “increase dopamine” but it supports dopamine receptors. It’ll even revive dysfunctional dopamine receptors. But it will not increase dopamine.
And NAC modulates glutamate preventing glutamate toxicity. It does not “lower glutamate levels”.
I’ve read a study about Nac, that it works but only for a short while, after 16 weeks only 20% of participants were responders.
https://pubmed.ncbi.nlm.nih.gov/26374743/
Do you personally think that it works for a longer duration, or do you know a lot of reports from people that it only works temporarily?
* for OCD
Shaun, first their dosage was too high in this study. Maximum effective dosage is 1,800 mg per day in 3 divided doses. Second, this was done with a very small group and the authors of the study mentioned this as well. Too small a group to come to a definite conclusion.
And third, NAC’s primary mechanism of action is increasing glutathione and support for dopamine receptors which is what most people use it for. And not to prevent glutamate toxicity. If it works for that I would count it as a bonus.
Hi David,
thats not completly true.
On reddit all people use NAC to reduce glutamate. NAC – Cysteine +glycine + glutamate is a cofactor to glutathione. Nac forces production of glutathione by using glutamate as cofactor aswell. As result glutamate physicaly decreases and this effect remains after quitting NAC.
Its the best supplement so far to reduce Glutamate.
There are really a lot of studys outside which confirm that.
Paolo, looks like somebody on Reddit got their facts a little mixed up. Glutathione is synthesized like this. The enzyme glutamate-cysteine ligase (GCL) is used to form a dipeptide which is then converted to Glutathione by the enzyme Glutathione synthetase. https://pubmed.ncbi.nlm.nih.gov/21815068/
And supplementing with NAC has been shown to normalize or modulate glutamate. Which means it some instances NAC will increase glutamate and others it will reduce glutamate all while trying to maintain glutamate homeostasis. https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC3340445/
If it modulates, would NAC decrease glutamate in people with high glutamate, and increase glutamate in people with low glutamate?
According to this study, yes: https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC3340445/
Hey David,
i most likely have issues with high glutamate, low gaba, high noradrenaline, high cortisol.
Maybe aswell issues with low testosterone and high estrogen. Not sure about dopamine and serotonin.
NAC does great for me, could you advise me any supplement which could synergize well with nac and solves my remaining problems ?
Thanks.
Paolo, the glutamine/glutamate/GABA cycle is a critical for protein synthesis, a precursor for muscle growth, regulation of the acid-base balance in your kidneys, provides oxidative fuel for your intestine and immune system cells, provides nitrogen transport between organs, acts as precursors to neurotransmitter synthesis, nucleotide and nucleic acid synthesis for glutathione production, and glucose metabolism.
For high glutamate and low GABA I suggest getting the balance back to this cycle by supplementing with L-Glutamine and GABA (PharmaGABA).
Excess noradrenaline is more difficult because it is made from dopamine. You don’t really want to lower dopamine levels but you can bring it back into balance by supplementing with L-Tryptophan for serotonin. Not sure if that will solve that problem but worth trying.
Cortisol can be lowered by using L-Theanine, Ashwagandha or Phosphatidylserine (PS).
Low-T and high estrogen needs to be addressed with a urologist who also does hormone replacement therapy. And that means a script for testosterone of some kind and 1 mg of Arimidex per week to lower estrogen.
Thanks David for your suggestions.
[edited for length]
Does that mean NAC helps with glutamate homeostasis ? Thats even better then simply phyiscally reducing it. Thanks.
Maybe NAC works through 2 ways on glutamate.
Im extremly interested in supplements which helps with homeostasis.
Im still looking for the master substance which can bring homeostasis to all neurotransmitter =), one time i will find it.
Paolo, that is exactly what I meant. Cysteine, NAC and Glutathione have a complicated relationship with your body and brain depending on where things are taking place. But in this instance and your concern about glutamate it’s just another great reason to continue using NAC as a nootropic supplement.
But there is no such thing as a “master substance” that keeps ALL neurotransmitters into balance. For example, excess dopamine will depress serotonin and vice versa. And Phosphatidylserine (PS) supports the storage, release, and activity of most major neurotransmitters and their receptors including dopamine and acetylcholine.
The machinery and microbiology in your skull is arguably the most complex thing in the universe. So finding one magic solution to keep everything in balance is not possible.
Hi David,
thanks again your knowledge is great.
If i try to find and create a stack, substances which promote homeostasis for each main neurotransmitter ?
Like
Glutamate: NAC (according you regulate glutamate)
Dopamine: Bacopa (is said to regulate dopamine)
Serotonin: …
Acetylcholine: …
Gaba: …
Noradrenaline: …
Do you think i could restore Homeostasis for those neurotransmitter ?
Or does the amount of combined substances break homeostasis ability ?
Because the problem with supplements overall is, if i take a supplement to physically increase/decrease a neurotransmitter its almost impossible to hit exactly perfect spot (“normal value”) and especially keep it. if you increase/decrease one to much you got issues aswell and at some point homestasis will bring more chaos to it.
While other supplements which simply push neurotransmitter for their working time do just worse homeostasis long term.
Its interesting what you say about phosphatidylserine, does that mean phosphatidylserine could help with low working neurotransmitter as result?
Paolo, last question first. It appears that Phosphatidylserine works with whatever neurotransmitters are available. It will not increase physical amounts of each in your brain. The only thing that will do that are its precursor along with whatever cofactors it uses during its synthesis.
There is no magic solution to keeping things in balance. But do this long enough and you learn to listen to your own body. You’ll know when something like dopamine or serotonin is out of whack.
Each of us is unique to a certain amount and the dosage of L-Tyrosine for example that I use will likely not work for you. It will more than likely be lower for you compared to what I need to use to feel ‘normal’.
Hey Dave, do you find the NAC dampens the effects of stimulants? I find that when I take them in conjunction, the NAC seems to make the effects milder. I find it best to take the NAC around 4-5 pm, which helps with the comedown. It feels like it heals my brain in a sense. In the am, I take modafinil, CDP Choline, pycnogenol, L-tyrosine. Around noon, I take another dose of CDP Choline and L-tyrosine. Around 4-5pm I take one or two doses of NAC with 5-10mg of lithium rotate, and L-Theonine, which seem to soothe things out and prevent a crash. Then at bedtime, I take Magnesium glycinate, L-Theonine, and L-Tryptophan. As I have read from your site, serotonin and dopamine must be in balance, which is why I supplement with the Tyrptophan at night, plus I want the sleep effects. I forgot to mention that around noon or so, when I have my first meal, I take fish oil, a multivitamin, vitamin D3 with K, Vitamin C, and a probiotic. If you think I’m missing anything from my stack, I’m all ears. Thanks again for all of the work you do.
Noah, NAC shouldn’t dampen the effects of stimulants. If fact, it supports the use of stimulants because it because it supports dopamine receptors.
And the adult human brain needs 1,000 mg DHA per day. Is your fish oil providing that amount of DHA?
David & Noah,
I’ve also noticed that NAC dumpens the effects of Ritalin which makes it difficult to take consistently.
Alex, my experience with NAC is completely the opposite of what you mentioned. Ritalin works better while using NAC because NAC has the unique ability to enable dopamine neurons to recover their function. Which is particularly important when using stimulants like Ritalin.
BTW, NAC helps support your immune function including you brain because it is a precursor to the synthesis of glutathione which is your master antioxidant. And antioxidants help eliminate free radicals preventing oxidative stress on brain cells. It does not “detox” anything.
Are you aware the fda has banned NAC David?
Jonathan, did you read this entire review? Including the last section called “Where to buy N-Acetyl L-Cysteine”?
Hi,
I am taking L-Glutamine to try to heal leaky gut symptoms. The only major side effect my thoughts have been a little more difficult to control. I also read that it can cause hypomania/mania although I have never been diagnosed. My question is: Will taking NAC help offset these effects that I have observed so I can continue taking the L-Glutamine? I see the remark about it helping with excess glutamate but I don’t exactly know thats the same/similar.
Thanks!
Kelly
Kelly, NAC may help but you have other options for healing a leaky gut. I’ve found that if you have a leaky gut you also likely have a leaky brain. And the repair of both is the same. See this article for options healing a leaky brain/gut: https://nootropicsexpert.com/how-to-heal-a-leaky-blood-brain-barrier/
One thing that did not make it on the list that has been proven to work is Quercetin (https://nootropicsexpert.com/quercetin/) which also helps heal a leaky gut.
Nac is one of the few supplements that help cervesa sickness. Tons of studies now on it. Its no irony certain govt groups finds time to attack this as soon as they see it works. It also helps ddimer and small vessel clotting after taking the company cervesa answer. Sorry Im vague but anyone following frontline people get exactly what Im saying. You can not use emergency use drugs when there are treatable options so remove and supress. Lets see nac used for decades and decades but in the middle of a pandemic this is what they decide to attack. Watch the bill in congress that wants to make it to where you can never buy a supplement again! Im not joking or being dramatic. 1984! The recapta on this is ridiculous
See now the FDA is I guess looking to remove NAC as a OTC Supplement?
Rob, did you read the entire review? I mention that in the “where to buy” section above.
https://www.nature.com/articles/s41467-021-24634-3
Hey Dave, I stumbled across this article on nature, claiming that NAC use can decrease longevity, which truly goes against everything I’ve read and learned about NAC. I really do believe this supplement is a God-send, and is very healthy for you, and is one of the best detox supplements out there, that actually work. NAC is a bonafide super supplement/drug in my opinion and has many studies to back that up. It is so powerful, it is used in hospitals for Tylenol overdose, so that has to count for something. I was wondering If you could check out the article and relay your thoughts?
Best,
Noah
Noah, I agree with your comment about using NAC as a nootropic supplement. My only comment on that study is it was done with worms. And it’s only one study out of hundreds of studies proving the benefits of using NAC as a supplement.
We are not the only ones who think NAC a great supplement. It is so good that one of the big pharmaceutical companies forced the FDA to take NAC off the market because they asserted that NAC was illegally sold as a dietary supplement and was approved as a drug September 14, 1963. There are some big players in the supplement world fighting this so stay tuned.
As always, you’re a voice of reason and a beacon of light. I’ll continue using NAC. Like you said, that’s one study out of hundreds, and we are not worms. By the way, it’s ironic Amazon stopped selling NAC, but you can still buy NAC at WholeFoods. You’re the man Dave!
Hey David,
I had to order n-acetyl-cysteine (NAC) from double woods because it seems to be sold out everywhere and not on amazon anymore and the cheap version had all these other ingredients, but its 1000mg, normally I take 600mg each night with brocomax – sulforaphane
I take it once per day 3hours before bed, Should I empty half the capsule or what or will 1000mg be safe as it only once per day with a glass of water, im worried it might cause kidney stones at that high dosage, or should I take it once every second night instead?
Thanks
Jesse, Double Wood Supplements NAC is 500 mg per capsule. Two capsules = 1,000 mg.
Would it be fine to take this twice per day, I read it can cause kidney stones if too much is taking, I take it with a large glass of water always tho
I was thinking of taking it in the morning as I’ve only been taking it before bed
600mg only. Should I increase? it helps my OCD somewhat. Also, can the body build up a tolerance to this if I do take it twice per day?
I also notice that you used to take to but no longer, may I ask why
it’s not on your what I take list? but I see you have somewhere on your youtube NAC video
Thanks
Jesse, if you have a genetic condition called Cystinuria do not use NAC because that can cause kidney stones. But if you do not have Cystinuria you do not need to worry about kidney stones.
And if that is the case a safe and normal dose for NAC is 600 mg 3-times per day. I continue to use NAC 3-times per day. If it’s no longer on my What I take list I’ll need to add it back. Thanks for the heads-up.
Thanks, I have been taking for a month no issues yet, Also I am finding it hard to find NAC now due to what the FDA is doing not sure how much longer it will be around for? I found this one
NOW Foods NAC 1000 mg Tablets
but noticed it has Microcrystalline Cellulose, Hydroxypropyl Cellulose, Stearic Acid (vegetable source), Vegetarian Coating and Silicon Dioxide.
I made sure it didn’t have Magnesium stearate in it, as that seems to be the worst
I read that you need to avoid these other things added however seem impossible sometimes, do you still have some of these other added things in your stack that seem impossible to avoid?
will it really cause long-term issues or just something that is better to avoid with having in your supplements??
Jesse, that NOW Foods NAC is only available in local stores that carry their product. You can still get it from here however: https://bit.ly/3yLPhik. Which does NOT contain any “other ingredients”.
There are certain supplements where you can do your best and still not avoid magnesium stearate and/or silicon dioxide. But if you need the supplement and keep it to a minimum hopefully your body will be able to cope with the toxins.
BTW, the problem with silicon dioxide is the presence of nanoparticles which researchers are still trying to figure out how much harm they can cause: https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2018.5088
Hi David,
I took NAC for two weeks and it was amazing for my anxiety. After that, however, it just stopped having any effect. I tried a different brand and same issue.
Could my Bipolar meds possibly be counteracting it?
I take a mood stabilizer (Lamictal 200mg twice/day), a antipsychotic (Seroquil 300mg) and an antidepressant (Zoloft 25mg).
Pan, it is almost certain that the drugs you are taking are having an effect. I humbly suggest that you learn exactly what each of those drugs do in your brain and the side effects associated with them. Wikipedia is a good source for easy to understand info about prescription drugs. For example, here is the one for Lamictal: https://en.wikipedia.org/wiki/Lamotrigine
I have been taking powdered NAC for a month. It worked well and i stopped lazing in bed for 2 hours after waking. I felt way more energetic and motivated.
Now im experiencing becoming tired and want to go sleep. I started taking about less than a 1/8 of a teaspoon. Then i increased it to about 3/4 of a teaspoon. I could meassure exactly with my gram scale for milligrams. But i got close.
Anyway, i think I will stay off for a few days where im not so sleepy. Then try the under an 1/8 tea like i started with.
Its helping my inflammation which i started for arthristic knees. And i can sure walk much better. But this sleepiness may be countering my good habits. Do you have any experience with the sleepy part?
Thanks
Its approx 400mg 1/8 tea
and 750 3/4 of teaspoon
Not exact because ive only a gram scale right now.
Pilan, scroll up and see the “Side Effects” section of this article for NAC. Sleepiness or drowsiness is very rare and usually from using high doses of NAC
Recommended dosage for NAC is 500 mg 3-times per day. That is a maximum of 1,500 mg of NAC per day. But you may need to use less.
The other thing is NAC enables dopamine receptors which means it will make your brain’s use of dopamine more efficient. The only downside to this is what happens if you don’t have enough dopamine to attach to those newly activated receptors? I’m not sure but it may be feelings of sleepiness.
You can safely increase dopamine in your brain with 500 mg L-Tyrosine 2 or 3-times per day.