L-tyrosine dosage child


David Tomen
David Tomen
15 minute read
Tyrosine enhances working memory, executive function, creative flow states, stress reduction, better mood, anti-anxiety and lessens symptoms of ADHD  

Key Takeaways

  1. Tyrosine boosts working memory, executive function, and creativity.
  2. It aids in stress reduction, mood improvement, and anxiety alleviation.
  3. Tyrosine lessens symptoms of ADHD.
  4. L-Tyrosine is a crucial precursor for catecholamine neurotransmitters​​.

L-Tyrosine is the master precursor required to form all catecholamine neurotransmitters.

Your brain uses the enzyme tyrosine hydroxylase to convert L-Tyrosine into L-DOPA. Decarboxylation of L-DOPA results in synthesis of the neurotransmitter dopamine.[i]

Once converted into dopamine, the enzyme dopamine-beta-hydroxylase converts L-DOPA into norepinephrine (noradrenaline).

And Phenylethanolamine n-methyltransferase converts norepinephrine into epinephrine (adrenaline).

This triad of neurotransmitters are collectively known as “catecholamines”.

Tyrosine can be a highly effective nootropic for boosting cognitive function. And is particularly helpful in maintaining cognitive performance when you’re under practically any kind of stress. Including music played above 90 dB’s.

L-Tyrosine works in synergy with stimulants like methylphenidate (i.e. Ritalin).[ii] Drugs like Ritalin work by blocking the reuptake of the neurotransmitters dopamine, and norepinephrine. And if there’s not enough dopamine available to do the job, Ritalin doesn’t work very well. L-Tyrosine potentiates increases in extracellular dopamine.

L-Tyrosine also stimulates the production of thyroid hormones T3 (triiodothyronine) and T4 (thyroxine) which are crucial in maintaining both overall physical and cognitive health.

L-Tyrosine can boost libido, memoryfocusconcentration, mood, offers anti-depressant effects, and improves executive function in those with ADHD.

Tyrosine helps:

  • Cognitive Stress. L-Tyrosine produces the catecholamine-triad of neurotransmitters dopaminenorepinephrine, and epinephrine. Sleep deprivation and extreme stressors like heat and cold can deplete catecholamine levels. L-Tyrosine restores them to preserve optimal cognition.[iii]
  • Neurotransmitters. L-Tyrosine is a required precursor for dopamine, norepinephrine, and epinephrine. As your dopamine levels increase, you’re better able to concentrate, organize your thoughts, and stay productive.
  • Attention Deficit Disorder (ADHD). L-Tyrosine can be an effective treatment for ADHD symptoms. It works in synergy with pharmaceutical drugs like Ritalin and Adderall by boosting extracellular levels of dopamine. Helping these drugs be more effective. And mitigating side effects like crashes when the drug wears off.


Your brain converts L-Tyrosine to L-DOPA which then produces the neurotransmitter dopamine. The unused dopamine is then further converted into the neurotransmitters norepinephrine (noradrenaline) and epinephrine (adrenaline). This triad of neurotransmitters are collectively referred to as “catecholamines”.

l-tyrosine reviews“Tyrosine” is derived from the Greek word tyros, meaning cheese.  It was first discovered by German chemist Justus von Liebig in 1846 in the protein casein from cheese.

Tyrosine is considered a non-essential amino acid because it can be synthesized in your body from phenylalanine. Which is found in many high-protein foods such as poultry, fish, dairy, nuts, soy products, lima beans, avocados and bananas.

L-Tyrosine amino acid supplementation enhances working memory and executive function in the prefrontal cortex. It helps with creative flow states, is fuel for inspirationcognitive flexibility, and the kind of “convergent thinking” you do in multiple choice exams.

L-Tyrosine assists in the production of thyroid hormones T3 (triiodothyronine) and T4 (thyroxine) which are crucial in maintaining both overall physical and cognitive health.

L-Tyrosine vs N-Acetyl L-Tyrosine (NALT): What’s the Difference?

N-Acetyl L-Tyrosine (NALT) is the amino acid L-Tyrosine with an acetyl group added. When you take NALT as a supplement, it breaks down in your kidneys back into L-Tyrosine. So in theory, the two supplements offer the same benefits.

There is some debate in the nootropics community on which is more effective. NALT or plain L-Tyrosine. NALT is a more soluble form of L-Tyrosine so it should be more bioavailable to your body.

However, some studies report that in some cases, a sizeable percentage of supplemental NALT is excreted in urine before it’s converted into L-Tyrosine.[iv]

On a personal note, I haven’t had any issues using NALT as a source of L-Tyrosine. It gives me a dopamine and adrenal boost you’d expect from supplementing with a dopamine precursor.

But when I haven’t any NALT around I successfully switch to L-Tyrosine although at a slightly higher dose.

When dealing with ADHD/ADD, L-Tyrosine is particularly effective when stacked with ALCAR (Acetyl-L-Carnitine). ALCAR easily crosses the blood-brain barrier for boosting acetylcholine levels. And seems to positively influence serotonin levels. And Tyrosine provides my brain with the dopamine it needs to mitigate symptoms of ADHD/ADD.

I find that L-Tyrosine stacked with 20 mg of Ritalin twice a day works particularly well. Clearly, this brain doesn’t have the capacity to produce enough dopamine on its own. And needs the boost that comes from supplementing with Tyrosine.

So like all nootropics, YMMV. Always take into account how each nootropic works synergistically with others in your stack. And how they work with any meds you need to take.

This is as much art as it is science. And experimentation is key for optimal cognition.

L-tyrosine dosage

How does L-Tyrosine work in the Brain?

L-Tyrosine boosts brain health and function in several ways. But two in particular stand out.

  1. L-Tyrosine improves memory and cognition under acute stress. Acute stress is defined as short-term stressors that can affect cognition. Examples are extreme heat or cold. Things like cold showers, extreme sports, car accidents, relationship problems, intense movies, business deals gone awry, exams and war zones.

In one study done at the University of Bedfordshire in the UK, the effect of L-Tyrosine on cognitive performance was measured before an exercise task.

Researchers recruited 8 soccer players. And had them complete a 90-minute soccer simulation performance test in an environmental chamber set at 77 degrees Fahrenheit.

The soccer players were given either L-Tyrosine before exercise or a placebo. Cognitive performance was measured before the exercise task. Then again at “half-time”, following half time, and following the entire simulation.

The cognitive performance task assessed dual-task and vigilance. The outcome revealed that cognitive vigilance and reaction time among soccer players significantly improved following administration of L-Tyrosine.

Results showed that in warm-weather conditions, L-Tyrosine could enhance cognitive function and prevent cognitive impairment during exposure to exercise-heat stress.[v]

  1. L-Tyrosine boosts neurotransmitters. L-Tyrosine taken as a supplement converts into the neurotransmitter dopamine. Dopamine helps control movement in your body, is fundamental to memory, attention and problem solving.

The unused dopamine can then convert into the neurotransmitters norepinephrine (noradrenaline) and epinephrine (adrenaline).

Norepinephrine is important for attentiveness, emotions, sleeping, dreaming and learning.

Epinephrine drives your ‘flight-or-flight’ response. It’s what prompts your reaction to dangerous circumstances, emergency situations, or in stressful situations or environments.

In one study done in the Netherlands, researchers determined if L-Tyrosine would boost cognitive resources associated with cognitive control. They performed tests designed to measure “working memory” using the N-Back Test.

Study participants were assigned to engage in a “1-back” condition of easy difficulty and then a 2-back condition of tougher difficulty. Those that used L-Tyrosine demonstrated superior performance in the 2-back test, but not the 1-back test.

The study authors suggested that L-Tyrosine provides greater cognitive enhancement when cognitive demand increases. The bottom-line; supplementation of L-Tyrosine may help you increase your IQ score due to maximizing catecholamine reserves.[vi]

How things go bad

As we get older, our brain and body chemistry and energy metabolism changes.

L-tyrosine side effects↓ Dopaminergic neurons are damaged or die

↓ Neurotransmitter levels decline

↓ Thyroid hormones decline

↑ Stress levels increase

↓ Working memory and mood decline

All of these changes are often attributed to aging. But could be a result of dietary and lifestyle choices.

Unchecked, they could lead to neurodegenerative diseases like Parkinson’s, a drop-in quality of life and depression.

L-Tyrosine benefits

L-Tyrosine can boost levels of the neurotransmitters dopamine, norepinephrine, and epinephrine. And contributes to the production of thyroid hormones T4 and T3.

Tyrosine can help boost cognition especially in stressful situations. It helps improve decision making, ‘flow state’ and creativity, cognitive flexibility, and working memory.

L-Tyrosine converts into L-DOPA to produce dopamine. L-DOPA is also used to make melanin in your body. This conversion process helps in the removal of neurotoxic quinones. And chelates heavy metals like mercury and lead which can accumulate in and damage neurons.

The dopamine that is not used by your brain is available to produce norepinephrine (noradrenaline) which is important for attentiveness, emotions, sleeping, dreaming, and learning.

L-Tyrosine can be an effective nootropic when stacked with ADHD/ADD meds like Ritalin or Adderall. It helps supply extracellular dopamine needed to improve the effectiveness of stimulants used to boost the uptake of dopamine in your brain.

How does L-Tyrosine as a nootropic feel?

Keep in mind that L-Tyrosine is a precursor to catecholamines. So if you’re not ‘low’ on dopamine, norepinephrine or epinephrine – you may not ‘feel’ anything.

L-tyrosine adhdMany neurohackers report a lift in mood, better focus, concentration, increased energy, and an overall sense of well-being. L-Tyrosine can help readjust your motivation levels. It can help lower anxiety levels, especially social anxiety.

Supplementing with L-Tyrosine can help bring your blood pressure down if its elevated from a stressful situation or environment. Take it before the stressful event if you can.

L-Tyrosine helps buffer the effects of stimulants like caffeine or amphetamines. It helps potentiate and prolong the effects of Ritalin or Adderall, and reduces the crash.

If you’re into athletics or do manual work, you’ll find that supplementing with L-Tyrosine before a workout or construction job will leave you feeling great afterwards. It helps mitigate many of the effects of acute stress caused by short-term stressors.

And L-Tyrosine helps your body to produce melanin, so you may find it easier to get a tan while at the beach.

l-tyrosine benefits

L-Tyrosine Research

L-Tyrosine to treat ADHD

Several studies have investigated using L-Tyrosine for the treatment of attention deficit hyperactivity disorder (ADHD). One informal study published in the 1980’s determined that L-Tyrosine resulted in short-term relief from ADHD symptoms. But subjects eventually reached tolerance and a diminished effect.

This is important for neurohackers to keep in mind. It seems that L-Tyrosine on its own can benefit some more than others. Regardless if you’re treating ADHD, or are perfectly cognitively healthy.

I’ve seen more than one report of nootropic users experiencing tolerance after just a week of supplementing with L-Tyrosine. But most peer-reviewed, published studies show positive results.

One study published in Neuropsychiatric Disease and Treatment in 2011 looked at using amino acid precursors for the treatment of deficit hyperactivity disorder (ADHD). Including L-Tyrosine for dopamine, and 5-HTP for serotonin.

The study used 85 young people aged 4 – 18 years old, all with a clinical diagnosis of ADHD. They were treated for an initial period of 8 – 10 weeks.

Urinary samples to determine serotonin and dopamine levels were collected within the first 4 weeks. If they didn’t reach adequate levels, subjects were moved to higher dosing levels 2 and then 3 until they got relief from symptoms.

Researchers found that the dopamine and serotonin precursors yielded similar results to Strattera and Ritalin. And “the amino acid protocol may be equal in efficacy to potent, pharmaceutical ADHD medications”.[vii]

L-Tyrosine reduces blood pressure under stress

This study is particularly interesting for its nootropic application. It’s commonly understood that blood pressure rises when we’re under stress. The source of stress doesn’t really matter. Stress up = blood pressure up.

A study in Amsterdam showed that L-Tyrosine administration decreased blood pressure about 15 minutes after ingestion. This study involved assessing task performance following acute stress.

Acute stress is usually short-term and can be caused by driving, fighting, athletics, martial arts training, war, combat training, CrossFit, cold showers, loud music, intense movies, loud noises, business deals, relationships, school, exams and more.

The point is, this study is applicable to every one of us. The study found that L-Tyrosine reduced diastolic blood pressure within 15 minutes of taking the supplement. And blood pressure normalized within 1 hour.

This study tells us that L-Tyrosine may promote a decrease in blood pressure caused by stress. And could be used to mitigate the effects of stressful situations if taken prior to the stressful event.[viii]

L-Tyrosine promotes cognitive flexibility

Cognitive flexibility applies to those who can adjust their thinking quickly to adapt to novel situations and stimuli. A high degree of cognitive flexibility is associated with increased fluid intelligence, superior reading and comprehension, and a healthier brain.

Recent research (2015) supports the idea that L-Tyrosine promotes cognitive flexibility. In this trial, researchers recruited 22 adults. And setup a double-blind, placebo-controlled study.

All subjects were assigned a task switching procedure to measure their flexibility. The results showed that receiving L-Tyrosine supplementation increased cognitive flexibility compared to the placebo group.

The researchers determined that “L-Tyrosine can facilitate cognitive flexibility by repleting cognitive resources”.[ix]

The team observed that increased cognitive flexibility was likely due to a boost in dopamine concentrations. They noted that L-Tyrosine enhanced usage of various cognitive resources. And one way to increase your cognitive flexibility would be to start supplementing with L-Tyrosine.

It stands to reason that people who are close-minded, set it their ways, are resistant to change and can’t cope with unexpected stimuli or situations have “cognitive rigidity”. And it’s likely due to suboptimal dopamine levels.

l tyrosine dosage child

L-Tyrosine Dosage

L-Tyrosine suggested dosage for cognitive benefit is 500 mg – 2 grams per day.

You may find your body responds to smaller doses. Or even more if you’re stacking it with stimulants like ADHD meds. Listen to your body and see how you react.

If you find you do not experience the full benefit from L-Tyrosine,  then try using it an hour before or two hours after a meal. Because L-Tyrosine taken as a supplement may compete with other amino acids in food for transport into your system.

I personally stack L-Tyrosine with my Ritalin dose twice per day. And a final dose of L-Tyrosine late afternoon to prevent a stimulant crash.

NOTE: long-term use of L-Tyrosine can suppress serotonin. Symptoms include depression, fatigue or severe anxiety feeling much like a panic attack. You can easily counter this by supporting serotonin with a 250 – 500 mg L-Tryptophan about 60 mins. before bed.

L-Tyrosine Side Effects

L-Tyrosine is considered non-toxic and very safe. Most neurohackers and healthy human adults don’t have any negative side effects from using amino acid tyrosine as a nootropic supplement.

At higher doses there are reports of stomach issues and migraines. Migraine problems usually happen to those who already suffer from migraines. This may be an indication that your neurotransmitter levels are already optimal, and you don’t need to supplement with L-Tyrosine.

L-Tyrosine can increase your thyroid hormones. So if you’re hyperthyroid you should use caution when supplementing with L-Tyrosine because it may change the way your thyroid meds work.

And if you’re taking MAO inhibitors (MAOI’s) like selegiline, Azilect, Marplan or Nardil you should not use L-Tyrosine.

Monoamine oxidase inhibitors (MAOIs) work in your brain by blocking the enzyme monoamine oxidase. This enzyme normally blocks excess dopamine. But when you block the enzyme, more dopamine is released.

So using L-Tyrosine in combination with MAOI’s could raise dopamine levels too high. Resulting in a rapid rise in blood pressure (hypertensive crisis). Causing severe headache, nausea and sweating, severe anxiety, rapid heartbeat, chest pain, vision changes, shortness of breath and confusion.

A severe increase in blood pressure from this combo can lead to hemorrhagic stroke or a heart attack.

Where to buy L-Tyrosine

L-Tyrosine is available to buy in powder, capsule and tablet form. Capsules and tablets are usually 300 – 500 mg.

Some pre-made nootropic stacks and workout stacks also include L-Tyrosine as part of their formula.

N-Acetyl L-Tyrosine (NALT) is an alternative to plain L-Tyrosine. NALT has an acetyl group added to L-Tyrosine in an attempt to make it more bioavailable.

For example, Mind Lab Pro® 4.0 contains 11 brain enhancing nootropic compounds including N-Acetyl L-Tyrosine.

I recommend Mind Lab Pro because it addresses all aspects of anxiety resistance, memory and cognitive enhancement, stabilizes mood, brain repair, and maintenance.

This premium nootropic stack is designed to affect neurotransmitters, cognitive energy, brain waves, neuroprotection, and regeneration. See my Mind Lab Pro review for a detailed report.

Ensure you read labels carefully and stick with manufacturers who follow Good Manufacturing Practices (GMP). And are GMP-Certified. And do your best to avoid toxic “other ingredients” which are usually listed at the bottom of “Supplement Facts” labels.

Nootropics Expert Recommendation

Nootropics Expert Tested and ApprovedL-Tyrosine 500 mg – 2 grams per day

I recommend using L-Tyrosine as a nootropic supplement.

Your body does synthesize some L-Tyrosine from phenylalanine which comes from high-protein foods like chicken, fish, almonds, avocados and bananas.

But most of us don’t get enough L-Tyrosine from our diet. So supplementation will help.

L-Tyrosine is helpful for most neurohackers to combat stress and sleep deprivation. It’ll boost dopamine, norepinephrine and epinephrine levels.

It’s particularly helpful if you take L-Tyrosine prior to a stressful situation, workout or physically demanding job.

L-Tyrosine is especially helpful to those dealing with ADHD/ADD. It’s a great compliment to stack with stimulant meds like Ritalin or Adderall. L-Tyrosine will provide the dopamine your brain needs. It will help smooth out and prolong the effects of stimulant meds. And help prevent the associated crash when they wear off.

A good stack for ADHD is using your usual med dose with L-Tyrosine 500 mg, Alpha GPC 300 mg, and ALCAR 500 mg. Which is should particularly effective if you are dealing with any phenylalanine abnormalities.

You can buy individual L-Tyrosine supplements. Or you could try my favorite pre-formulated nootropic stack Mind Lab Pro® 4.0 which includes N-Acetyl L-Tyrosine (NALT).

Mind Lab Pro contains a synergistic blend of 11 brain enhancing nootropics covering all aspects of cognition and brain health. See my full Mind Lab Pro review for more.

You can safely use up to 2,000 mg per day when stacking with ADHD meds. But in smaller divided doses throughout your day.

As an Amazon Associate I earn from qualifying purchases. This post may also contain other affiliate links and I will be compensated if you make a purchase after clicking on my links.

[i] Slominski A., Zmijewski M., Pawelek J. “L-tyrosine and L-DOPA as hormone-like regulators of melanocytes functions” Pigment Cell Melanoma Research. 2012 Jan; 25(1): 14–27. (source)

[ii] Woods S.K., Meyer J.S. “Exogenous tyrosine potentiates the methylphenidate-induced increase in extracellular dopamine in the nucleus accumbens: a microdialysis study.” Brain Research. 1991 Sep 27;560(1-2):97-105. (source)

[iii] Hase A., Jung S.E., aan het Rot M. “Behavioral and cognitive effects of tyrosine intake in healthy human adults.” Pharmacology, Biochemistry and Behavior. 2015 Jun;133:1-6. (source)

[iv] Magnusson I., Ekman L., Wångdahl M., Wahren J. “N-acetyl-L-tyrosine and N-acetyl-L-cysteine as tyrosine and cysteine precursors during intravenous infusion in humans.” Metabolism. 1989 Oct;38(10):957-61. (source)

[v] Coull N.A., Watkins S.L., Aldous J.W., Warren L.K., Chrismas B.C., Dascombe B., Mauger A.R., Abt G., Taylor L. “Effect of tyrosine ingestion on cognitive and physical performance utilising an intermittent soccer performance test (iSPT) in a warm environment.” European Journal of Applied Physiology. 2015 Feb;115(2):373-86. (source)

[vi] Colzato L.S., Jongkees B.J., Sellaro R., Hommel B. “Working memory reloaded: tyrosine repletes updating in the N-back task.” Frontiers in Behavioral Neuroscience. 2013 Dec 16;7:200. (source)

[vii] Hinz M., Stein A., Neff R., Weinberg R., Uncini T. “Treatment of attention deficit hyperactivity disorder with monoamine amino acid precursors and organic cation transporter assay interpretation” Neuropsychiatric Disease and Treatment. 2011; 7: 31–38. (source)

[viii] Deijen J.B., Orlebeke J.F. “Effect of tyrosine on cognitive function and blood pressure under stress.” Brain Research Bulletin. 1994;33(3):319-23. (source)

[ix] Steenbergen L., Sellaro R., Hommel B., Colzato L.S. “Tyrosine promotes cognitive flexibility: evidence from proactive vs. reactive control during task switching performance.” Neuropsychologia. 2015 Mar;69:50-5 (source)

Subscribe to the Nootropics Expert newsletter

Keep up to date with the latest developments in the nootropics space.

Head First 2nd Editon

The Award Winning Guide to Healing & Optimizing Your Brain with Nootropic Supplements.

Head First 2nd Edition

NEW! Eliminate Brain Fog, Low Energy, Moodiness, Difficulty Sleeping, Memory Loss or Anxiety. Available on Amazon, Barnes & Noble, Apple Books, Walmart and more...

Where to Buy Nootropics

Wondering where to buy the best nootropic supplements? Well, you’re in the right place. Because here you will find the nootropic supplements that I personally use and recommend. Each supplement has a link to the company store and product that I use. I also include a link to my full review for each supplement here […]

The Definitive Guide to Nootropics

Nootropics can help increase your memory, boost learning ability, improve your mood and assist overall brain function. If you’re new to nootropics, or wonder about the difference between a nootropic and a smart drug, then this page is for you. Here you’ll find the definition of a nootropic, how to pronounce the word “nootropic”, the […]

The Most Comprehensive Nootropics List

This is our big list of the most popular Nootropics in use today. Here you’ll learn what each nootropic is, what it does and suggested dosages. What is this List of Nootropics About? Nootropic supplements are cognitive enhancers aiming to improve brain function. Whether you are looking to treat mild cognitive impairment, improve mental focus, or biohack […]

Free Secrets of the Brain 3rd Edition

Get “Secrets of the Optimized Brain,” 92 nootropics to help you plan your Nootropic Stack when you sign up for my newsletter:

Join The Discussion - 371 comments

Rosie Hayes
May 14, 2021

Hi I’m wondering whether you could advise me?

I have suffered with depression my whole life, and bouts of anxiety too (which to me were like constant explosions in my chest. Antidepressants have never helped me, they took too much away from me, just numb, which was depressing in itself. I’m finally off the beta blockers for the anxiety and don’t seem to be suffering with that any more/at the moment.

I have been taking 200mg (active ingredient) 5-HTP and 500mg T-yrosine every morning for about 6 months and feel so much better. I hope these levels are ok.

Thing is, my 19 y/o daughter has finally been diagnosed with Aspergers and ADHD (been trying to get a diagnosis for Aspergers for 17 years, the ADHD we hadn’t even thought about) a few weeks ago, and its made me realise I have ADHD too. I have my assessment in a couple of weeks. It will explain my inability to deal with stress, my emotions, to focus, to complete tasks, memory, issues with rejection, inability to begin tasks, basically all the ways which have made me feel like my life has been one big uphill struggle since always. 5-HTP and L-Tyrosine have helped with the emotional balance, but the rest is still very much an issue.

If I am diagnosed, will Concerta interact with the L-Tyrosine and 5-HTP? Is it safe?

I’d really appreciate your feedback on this.

Thank you

    David Tomen
    May 14, 2021

    Rosie, L-Tyrosine should support the use of Concerta. See my ADD article for how to use nootropics with stimulants successfully: https://nootropicsexpert.com/best-nootropics-for-adhd-add/

    5-HTP is another story. Please be careful with it because it is very easy to overdo it. And serotonin and dopamine go out of balance and nasty things happen. Better to use L-Tryptophan in my opinion because it is safer to use and easier to dose.

May 3, 2021

Hi David,
I have used SSRI (Luvox) successfully in the past for chemical imbalance / anxiety / insomnia yet somehow I have had no luck with 5HTP or Tryptophan. 50mg 5HTP or 500mg L-Tryptophan makes me ill / spacey / nauseous and worsens my anxiety and sleep issues. The only thing that helps me sleep through till around 4.30am is 400mg L-Theanine at night (could be a cortisol issue?). 200mg L-Theanine is not enough. I still have a bit of nausea, eye/headaches and concentration issues during the day and am contemplating trying L-Tyrosine. Given L-Theanine enables dopamine production will this be too much? Is it safe to mix L-Tyrosine and L-Theanine? Thank you

    David Tomen
    May 4, 2021

    Rob, Luvox also affects norepinephrine so you could try L-Tyrosine during the day and see if it helps.

    L-Theanine does NOT product dopamine. But helps your brain release more of what is already there. L-Tyrosine is a precursor and along with Vitamins B6, B19 & B12 does produces more dopamine.

    You can combine L-Tyrosine with L-Theanine and evidence of that is Performance Lab Stim which uses both. https://www.performancelab.com/products/stim

      May 5, 2021

      Hi David,

      Thank you so much for your response. Luvox is an SSRI and I wasn’t aware that it affects norepinephrine as well as serotonin. If that is the case it makes sense as I have had improvements in attention with Tyrosine before. Can you please confirm. Thank you.

        David Tomen
        May 5, 2021

        Rob, I got my information about Fluoxetine (Luvox) from here: https://en.wikipedia.org/wiki/Fluvoxamine. The author referenced a book called “Goodman & Gilman’s The Pharmacological Basis of Therapeutics”.

        May 5, 2021


        May 5, 2021

        One last query.
        What dosage do you recommend for l-tyrosine?
        I have read 500mg AM, MM and MA (not after 2pm as it is stimulating as a starting does. Is that too much?
        Also I read one of your previous blog posts regarding the need to take 5HTP/Tryptophan with L-Tyrosine (not necessarily same time) so as to not deplete serotonin or dopamine. I recall the ratio was 10:1 Tyrosine:5HTP. 1000mg Tyro to 100mg 5HTP.
        My question is will L-Theanine achieve the same result as 5HTP in terms of ensuring serotonin is not depleted? Or is it optimal to take 5HTP at night with l-Tyrosine during the day?
        Thanks again.

        David Tomen
        May 6, 2021

        Rob, depending on your system the recommended dosage of L-Tyrosine is 500 mg 2 or 3-times per day (morning, noon and mid/late afternoon). Generally, you don’t want to take L-Tyrosine after 4 PM as it may interfere with sleep.

        The last dose is most useful if you are using stimulants as the last dose prevents a stimulant crash. If you don’t use stimulants the 3rd dose if optional. Keep in mind that a dose of L-Tyrosine at 8 am is gone by noon.

        Dopamine and serotonin must be in balance. Most can get sufficient serotonin by using 500 mg L-Tryptophan before bed. 1000 mg is usually too much and may backfire on you.

        I recommend avoiding 5-HTP and using L-Tryptophan instead because it is safer and easier to dose.

April 8, 2021

David, your content is very exciting to me. I’ve been maxed out on my ADHD meds for I would guess close to 4 years. I feel I am in a constant personal search to find something to help me feel like me again. I’ve recently become aware of executive function disorder and I cry every time I read about it because it literally IS and has been the biggest obstacle and most debilitating aspect of my entire life. My anxiety is through the roof and I feel like this pathetic person because I can’t do simple tasks like organize my bathroom cabinets or buy new clothes because the thought of it is all so overwhelming.

I have an autistic/ADHD 14 year old and also an autistic/adhd 4 year old that needs me and I am desperate to help me so that I can help and assist her.

In addition to all of that, I have little to no libido and my marriage is affected because of it.

What would you suggest for me? I have been back and forth on max doses of Adderall XR, Vyvanse, and Adderall IR. I take Ambien at night for sleep but lately, that’s not very effective either.

Also, is L Tyrosine safe for children and at what doses? I would love to use natural products like these rather than Rx meds for my children for as long as possible. Thank you so much for your time.

    David Tomen
    April 9, 2021

    LeeAnn, this is how you support using ADHD meds: https://nootropicsexpert.com/best-nootropics-for-adhd-add/

    The basic nootropic stack described in that article includes; L-Tyrosine, Alpha GPC, ALCAR, DHA, and possibly Phosphatidylserine (PS) along with a high quality B-Complex or Mind Lab Pro.

    Dosages for children are above my ‘payscale’ so I would check with a pediatrician. But you may be able to find dosages for some of these on a government site like PubMed.

      April 9, 2021

      Thank you so much for your reply. When you say, “or Mind Lab Pro,” are you saying that Mind Lab Pro could be used “instead” of the stack you listed? Or was the Mind Lab Pro only in place of the high quality B-complex? Would the Mind Lab Pro in addition to L-Tyrosine be efficient?

      I would prefer to take as few pills as possible but am also willing to try whatever it takes.

      Also, can you recommend a magnesium product and high quality B-Complex that will help in my situation?

        David Tomen
        April 16, 2021

        LeeAnn, sorry for the late response. Been a crazy week. I said “Mind Lab Pro or a high quality B-Complex” because you need Vitamins B6, B9 and B12 to work with L-Tyrosine to make dopamine. L-Tyrosine can’t do it alone. Mind Lab Pro contains those B-Vitamins as part of its formula for that reason.

        But Mind Lab Pro provides many other benefits besides boosting dopamine. So it is up to you.

        If you decide on a B-Complex this is the one I recommend: https://amzn.to/2Q0FDXH

        Magnesium: https://amzn.to/3giT6ou

April 3, 2021

Is it okay to take L-Tyrosine (500mg) with Taurine (500mg) daily?
I am vegan and suffering with symptoms similar to hypothyroidism

    David Tomen
    April 3, 2021

    Neil, you can use L-Tyrosine with Taurine without a problem. I do it a couple times a day.

February 28, 2021

For someone who takes Adderall every day, this destroys dopamine is l-tyrosine the best way to bring that back? Fix it and replenish it?

February 5, 2021

Hello David,
I got early hyperpigmentation under the eyes and a palpitation , my thyroid tests are ok, maybe this is due to the syndrome of tired adrenal glands and what are your suggesting about supplementing it
Thank you

    David Tomen
    February 7, 2021

    Anatoly, it could be an iron deficiency. You may want to get these tests done to check if it is: Iron, Ferritin, Transferrin and Iron-binding Capacity (TIBC, UIBC)

      February 9, 2021

      Hello Dawid , already check it , it was iron deficiency, so I treated it, but now my test perfectly , what else it could be?

        David Tomen
        February 10, 2021

        Anatoly, this is something you’ll need to investigate on your own. Because there is no easy answer. Please read the second paragraph in this clinical study which details the various causes of dark circles under the eyes: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6927230/.

        I suggest carefully considering each of the causes offered in that study. And look at your life and lifestyle to see if there is anything that you recognize in that list. This may take time and it’ll be frustrating. But stay with it until you have your answer and know if there is anything you can to remedy it. Only you can do this.

        Anatoly Shestakov
        February 11, 2021

        Hello David thanx you

February 1, 2021

Hello David David, I would like to know please if 250 Mg of tryptophan per day is sufficient when consuming only 500 Mg of Tyrosine per day to keep the levels of Seratonin and dopamine in balance ?, higher doses of Tryptofan have affected my sleep in a bad way that’s why I consume just that amount

    David Tomen
    February 2, 2021

    Flavio, it depends on your unique system. If 250 mg L-Tryptophan works for you then continue with that dose.

January 31, 2021

Hi David,

After years of treating depression with SSRI and SNRI (which mostly I can’t take because side effects were too big and my digestive system is too fragile) I suspect that I have ADD rather then depression (which kick offs sometimes on top of ADD). From my intuition and observation through the years I suspect that noradrenaline is the most crucial in my case but I’am not 100% sure it is so. I also noticed that messing with dopamine always very quickly makes me sick. Serotonin – not 100% sure. My question is what would be a best try for ADD (preferably to touch noradrenaline without messing with dopamine)? I need something for activation but also not to alter anxiety. Right now I’am kind of depressed with muscle problems which get to tense because of stress. So I have problems with longer walks as it drains my energy and I feel very heavy legs + low mood, concentration problems etc. This muscle (+low energy problem) seems to be always main problem it’s holding me down with most activities.

What I’ve noticed so far after taking different things :

Sertraline – typical SSRI – once helped me a lot few years ago but in a big dose, now I have big problem to get through first 2-3 weeks so it’s almost impossible to go through first few days. So I suspect that it did something in big dose, not only to serotonin but maybe noradrenaline or dopamine – not sure.

iMAO (moclobemide) – could only last two weeks on it on small dose – it had mild but good activating feel and I felt not so tired on it however after 2 weeks time I felt my joints and muscles are somehow getting blocked or overwhelmed and as often in my case with antidepressants after some time when it accumulates I feel my body says I can not take it and digest it. I think it might be because of altering dopamine (not sure). But as I said at first it was nice to feel some activation probably due to noradrenaline touch at first.

SNRI – duloxetine – was on it 3 months but too many digestion/intestine problems. It was activating but with terrible side effects and withdrawl syndrome was even worse.

NAC – long time ago, small dose triggered anxiety very quickly.

Rhodiola Rosea – good one, however I can not digest it, either stomach or my intestines protested (maybe dosage was too big).

L-theanine – for sure not for me – made me kind of dizzy/anxious/chaotic rush in my mind.

+few more antidepressants I couldn’t get on due to all side effects.

What I think of now is L-Tyrosine or Ginseng maybe. I’ve not tried any ADD medication so far as I need doc. to confirm this first.

Can L-Tyrosine mess with dopamine in bad way in my case?
Or if dopamine is relatively fine it will not alter it and will take care of noradrenaline only if it’s missing?

Thank you

    David Tomen
    February 4, 2021

    Maciej, apologies for replying to you so late. But I think you are already onto something and don’t realize it.

    Moclobemide (https://en.wikipedia.org/wiki/Moclobemide#Pharmacology) is a Monoamine Oxidase – A inhibitor (MAO-A). Which means it increases levels of norepinephrine (noradrenaline), dopamine, and especially serotonin.

    While these drugs don’t “accumulate” in your system they can begin to change the function of receptors, synapses, transporters, ion channels and even gene expression if used long enough.

    You can get these benefits naturally by using a ‘natural MAOI’. Rhodiola Rosea is one example. But there are several others as well. Do a search using the search function top right of the menu and search for “MAOI” and see what else turns up.

    Rhodiola Rosea or one of these others may work for you long term. But you need to get the right supplement (i.e. high quality) and the right size of dose.

    L-Tyrosine is a direct precursor to the synthesis of dopamine. Which then goes on to make norepinephrine and epinephrine.

    One thing you are ‘missing’ when it comes to muscle problems is acetylcholine. Muscle movement is governed in part by dopamine and the signal to move comes from acetylcholine. I suggest adding Alpha GPC or CDP-Choline to whatever you end up using to boost norepinephrine because you need the acetylcholine as well. Dopamine does not work in isolation. It needs the support of acetylcholine AND serotonin.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.