Vitamin B6 (P-5-P) dosage

Vitamin B6 (Pyridoxine)

David Tomen
David Tomen
15 minute read
Vitamin B6 is known to enhance alertness, cognition, energy, elevate mood, lower anxiety and normalize homocysteine levels

Vitamin B6 (Pyridoxine, Pyridoxal, Pyridoxamine) is one of 8 B-vitamins. B6 is water-soluble and found in every single cell in your body.

Vitamin B6 a required coenzyme for the synthesis of dopamine, epinephrine, GABA, melatonin, norepinephrine, and serotonin.[i]

As a nootropic, Vitamin B6 is crucial for the synthesis of these neurotransmitters. Even mild deficiency results in down-regulation of GABA and serotonin synthesis. Leading to poor sleep, behavior, cardiovascular function, and the loss of hypothalamus-pituitary control of hormone secretion.[ii]

Vitamin B6 was first isolated in the 1930’s. The “6” in Vitamin B6 refers to six common forms, namely pyridoxal, pyridoxine (pyridoxal), pyridoxamine, and their phosphorylated forms.

Pyridoxal phosphate (pyridoxal 5′-phosphate, P-5-P, PLP), the active form of Vitamin B6 is said to be the most versatile organic cofactor in biology. More than 140 distinct enzyme activities in your body and brain depend on PLP.[iii]

The biochemical reactions in your body by PLP-dependent enzymes include the making of hemoglobin, amino acid synthesis and fatty acid metabolism.

PLP also functions as a coenzyme that catalyzes the release of glucose from stored glycogen. Turning it into the type of energy your brain cells can use for fuel.

Vitamin B6 (Pyridoxine) helps:

  • Cerebral Circulation: Vitamin B6 is needed to regulate homocysteine. High homocysteine levels are linked to inflammation that can lead to blood vessel damage. And possible plaque buildup leading to heart attack or stroke.
  • Neurotransmitters: Vitamin B6 is a cofactor in the synthesis of neurotransmitters dopamine, epinephrine, GABA, norepinephrine, and serotonin. Affecting alertness, cognition, learning and memory and mood.
  • Mood: Vitamin B6 helps increase brain serotonin and dopamine levels. Decreasing anxiety, depression, fatigue and pain.


Vitamin B6 (Pyridoxine, Pyridoxal, Pyridoxamine) is one of 8 water-soluble B-vitamins that are absolutely vital to the highly optimized brain. And is essential to all forms of life.

Vitamin B6 (pyridoxal 5′-phosphate)

Vitamin B6 is found in every cell in your body and brain. Vitamin B6 is a necessary cofactor in the folate cycle. And contributes to the synthesis of neurotransmitters dopamine, GABA, melatonin, norepinephrine, and serotonin.

Vitamin B6 has a direct effect on your immune system, gene transcription and expression. And is involved in glucose regulation.

Vitamin B6 protects your blood-brain barrier by regulating homocysteine levels. Excess homocysteine can damage blood vessel linings and neurons, resulting in cognitive decline. B6 also helps form myelin, the fatty sheath that surrounds and protects neurons.

Pyridoxal phosphate (pyridoxal 5′-phosphate, P-5-P, PLP), the active form of Vitamin B6 helps control inflammation in your brain. Low levels of PLP are associated with severe inflammation in the brain.[iv] Leading to neurodegenerative diseases like Alzheimer’s and Parkinson’s. And contributes to heart disease, arthritis, inflammatory bowel disease and diabetes.

Foods rich in Vitamin B6 include bananas, beef, chickpeas, pistachios, pork, potatoes, and turkey.

Even mild Vitamin B6 deficiency can deplete neurotransmitters which leads to cognitive decline. Resulting in brain fog, anxiety, depression and overall poor mental performance.


How does Vitamin B6 (Pyridoxine) work in the Brain?

Vitamin B6 (Pyridoxine) boosts brain health and function in several ways. But two in particular stand out.

  1. Vitamin B6 is a cofactor in neurotransmitter synthesis. Vitamin B6 and its role in amino acid metabolism makes it a critical component for the synthesis of all major neurotransmitters including dopamine, GABA, melatonin, norepinephrine and serotonin.

The synthesis of these neurotransmitters is entirely dependent on B6 levels in your brain. Even mild deficiency results in less GABA and serotonin synthesis. Resulting in poor sleep patterns, irritability, anxiety, depression, panic attacks and stress.

Low dopamine and norepinephrine levels due to lack of Vitamin B6 leads to depression and loss of memory.

B-Vitamins play a crucial role in optimized cognition. And should be part of every nootropic stack. Unfortunately, there is very little talk in nootropic circles of these vitamins.

A review of vitamin intakes in Germany, the UK, the Netherlands and the USA was conducted to compare vitamin intake to national recommendations. And the study found intake was below recommendations of even the most critical of vitamins. Including B-Vitamins.

The authors of the study noted that this gap exists in vitamin intake and national recommendations for a significant portion of the population. Even though diverse foods were available.[v]

  1. Vitamin B6 helps reduce inflammation. B6 along with Vitamin B12 and folate help control homocysteine. High levels of homocysteine have been implicated in inflammation leading to damage of blood vessels. Causing heart and neurodegenerative disease.

But homocysteine is not the bad guy when it’s in balance. We need this amino acid for the synthesis of cysteine which is a precursor to the master antioxidant glutathione.

It’s when homocysteine gets out of control that causes problems in our brain and our cardiovascular system. One of the issues with aging is brain shrinkage. Gray matter shrinkage in key areas of the brain have been identified in Alzheimer’s Disease.

Professor David Smith at Oxford University in England conducted a study with 156 elderly patients (age 70+) who were suffering mild memory loss and higher than average levels of homocysteine. High levels of homocysteine are typically the result of deficiencies in Vitamins B6, B12 and folic acid.

For 2 years, the elderly patients received 20 mg of Vitamin B6, 0.5 mg of Vitamin B12 and 0.8 mg of folic acid (folate). The findings of this study were dramatic. Those who took only placebo experienced brain atrophy of 5.6% over those 2 years. Brain shrinkage in those who took the B-Vitamins had only 0.6% brain shrinkage.

This study showed a 7-fold difference in gray matter shrinkage in just 2 years. Vitamin B6 along with B12 and folic acid helped protect brain density. And specifically in the areas of the brain vulnerable to Alzheimer’s.[vi]

How things go bad

Vitamin B6 deficiency is a lot more common than you’d expect in our modern society. B6 from diet alone, especially for vegetarians and the aged is not adequate to supply what our body and brain needs.

Concentration, memory, learning, and recall decline

↑ Anxiety, confusion, irritability, and depression increase

↑ Homocysteine and inflammation increases

↓ Energy levels decline

Vitamin B6 is critical for nerve function. And a deficiency can result in psychiatric disorders, seizures, migraines, chronic pain and mood disorders like depression.

Vitamin B6 (Pyridoxine) benefits

Vitamin B6 is involved in the regulation of cognition function and mood. B6 is a cofactor in the neurotransmitters directly related to alertness, anxiety, attention, concentration, memory and mood.[vii]Vitamin B6 improves concentration and focus

When you add Phenylalanine to your stack to boost the neurotransmitters dopamine, epinephrine, norepinephrine and melatonin, it will not work without Vitamin B6. B6 is a critical cofactor in the synthesis of these neurotransmitters.

The same holds true for any nootropic you use with the intention of boosting any of the major neurotransmitters in your brain. Vitamin B6 is absolutely required if you want them to do their job.

You need Vitamin B6 to help control inflammation in your brain. B6 suppresses the inflammatory cytokines interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α).[viii]

Vitamin B6 is essential for controlling elevated homocysteine levels which can damage blood vessels crucial for optimal cerebral circulation.

A 2008 review of research in the previous 10 years covering a total of 77 studies and 34,000 subjects demonstrated the relationship between cognitive deficits and dementia and the status of folate, or vitamins B12, or B6 and homocysteine levels.[ix]

Vitamin B6 is a coenzyme involved in the synthesis of Heme, an iron-containing component of hemoglobin. Hemoglobin is found in red blood cells and is critical to their ability to transport oxygen throughout your body and brain.

Vitamin B6 concentrations in your brain are about 100-times higher than levels in your blood. B6 is critical to the highly optimized brain.

How does Vitamin B6 (Pyridoxine) feel?

Vitamin B6 improves moodVitamin B6 is water-soluble, and has been shown to improve energy and mood. Both men and women report a boost in libido when supplementing with B6.

Women report that Vitamin B6 helps control mood swings resulting from PMS.

Neurohackers report that Vitamin B6 helps sleep and creates vivid dreams. Many prefer it over melatonin for sleep.

Those suffering with carpal tunnel syndrome have consistently found relief in symptoms by using Vitamin B6. Many find B6 useful for tendonitis and other joint pain.

Some report that supplementing with Vitamin B6 helps prevent sunburn. And a few have found relief from tinnitus by using B6.

Those dealing with ADHD have found that using Vitamin B6 has helped reduce the reliance on ADHD meds. Likely because B6 is a cofactor in the synthesis of dopamine and norepinephrine.

Vitamin B6 boosts neurotransmitters

Vitamin B6 Clinical Research

Vitamin B6 (Pyridoxine) promotes vivid dreams

Read the reviews of those supplementing with Vitamin B6 and you’ll come across several reports of improved sleep and vivid dreams. And we have science to back this up.

12 college students participated in a double-blind, placebo-controlled trial to examine the various claims that Vitamin B6 increase dream vividness, and the ability to recall dreams.

The students were given 100 or 250 mg of Vitamin B6 or a placebo prior to bedtime for 5 consecutive days. Morning reports indicated a significant difference in ‘dream-salience scores’. This is a composite score measuring dream vividness, bizarreness, emotionality and color.

The study suggests that Vitamin B6 may act by increasing arousal during rapid eye movement (REM) sleep. The researchers hypothesized it had something to do with the conversion of tryptophan to serotonin.[x]

Vitamin B6 (Pyridoxine) may prevent Parkinson’s Disease

A study out of the Netherlands suggests that Vitamin B6 could cut the risk of Parkinson’s Disease in half.

Researchers in Rotterdam recruited 5,289 people over the age of 55 and assessed their dietary intake using food questionnaires. This study looked into reports that increased levels of the amino acid homocysteine might promote Parkinson’s Disease.

Numerous studies have reported that higher intakes of folate, Vitamin B12 and Vitamin B6 decrease blood homocysteine levels and could offer protection from Parkinson’s.

It has also been proposed that Vitamin B6 could provide antioxidant effects. And could reduce the risk factor for Parkinson’s by a mechanism that is not related to homocysteine.

After 9.7 years of follow-up, 72 new cases of Parkinson’s Disease had been diagnosed. The average Vitamin B6 intake was 1.63 mg per day, average B12 intake was 5.3 mcg per day, and average folate intake was 218.7 mcg per day.

No significant reductions in the risk of Parkinson’s were found for folate or Vitamin B12. But when the researchers limited their calculations to the 66% of participants who were smokers, they found that the protective effects of high Vitamin B6 intake appeared limited to this group.

The researchers noted that several studies indicate the protective effects of nicotine on brain cells, and reduced the risk of Parkinson’s. Which suggests that Vitamin B6 plus nicotine provides mutually reinforcing beneficial effects.

Since folate and Vitamin B12 showed no relationship to reduced Parkinson’s, the researchers concluded it was not homocysteine that was behind the newly diagnosed patients.

The study authors said that the apparent benefits of B6, “may point towards an alternative mechanism… because several lines of evidence suggest neuroprotective properties of Vitamin B6 through antioxidant capacities”.

Oxidative stress has been shown to be prominent in Parkinson’s Disease, and higher Vitamin B6 intake may reduce Parkinson’s risk through its antioxidant effects.[xi]

Vitamin B6 (Pyridoxine) to beat Panic Attacks

Reduced serotonin levels are known as one of the causes of panic attacks and hyperventilation attacks. Serotonin is synthesized from tryptophan. And for the synthesis of serotonin, you need Vitamin B6 and iron.

The clarify how this works, researchers at Atago Hospital in Japan checked the blood levels (vitamins B2, B6, and B12 and iron) of patients who came into the ER with a panic attack or hyperventilation attack.

The team measured parameters in 21 patients compared to 20 healthy volunteers. The study found that both Vitamin B6 and iron levels were significantly lower in the panic and hyperventilation attack people than in the healthy volunteers.

There was no significant difference in Vitamin B2 or B12. The study concluded that low blood concentrations of Vitamin B6 and iron are involved in panic and hyperventilation attacks.[xii]

Vitamin B6 recommended dosage

Recommended dosage of pyridoxal 5′-phosphate (P-5-P) form of Vitamin B6 is up to 100 mg per day. P-5-P is the only ‘active’ form of B6 available and preferred for nootropic usage. (see “Side Effects” for toxicity with Vitamin B6).Vitamin B6 (P-5-P) dosage

The enzyme L-dopa decarboxylase depends on P-5-P to convert L-DOPA into dopamine. And is involved in the final stages of serotonin synthesis.[xiii]

An analysis of data collected in the USA in 2003-2004 indicated that Vitamin B6 intake from food averaged about 1.9 mg per day.[xiv] The problem is some forms of Vitamin B6 from plants (pyridoxine glucoside) are not very bioavailable.

In most cases, and certainly that of neurohackers using nootropics to boost neurotransmitters or improve mood, Vitamin B6 from diet alone is not enough.

The study mentioned above shows that even those supplementing with 2 mg per day of Vitamin B6 or less had blood levels of B6 much too low.

Vitamin B6 is water-soluble and you excrete it in urine, so supplementation daily is critical.

Women taking birth control pills, or who are menstruating are usually low in Vitamin B6. Those following a strict vegetarian diet are also typically deficient in B6.

Drugs like L-DOPA, anti-tuberculosis medications, metal chelators, methylxanthines to treat respiratory conditions, and long-term use of NSAIDs, anti-convulsants, and phenobarbital all inhibit Vitamin B6 metabolism. If you are using any of these drugs you are likely low in B6.

You can safely dose up to 100 mg per day of Vitamin B6 with no toxic effects.

Vitamin BSide Effects

Vitamin B6 (Pyridoxine) is non-toxic at recommended doses. So is considered well-tolerated and safe.

Side effects are rare but very high single doses can include stomach upset, nausea or diarrhea.

Pyridoxine neuropathy is a form of nerve damage caused by high doses of Vitamin B6 when taken for extended periods. Symptoms are loss of coordination, extreme skin sensitivity, bone pain, muscle weakness, and numbness.

Pyridoxine neuropathy has been reported in doses of Vitamin B6 of 200 mg to 5 grams per day for extended periods. When dosing was stopped, symptoms usually disappeared.[xv] [xvi]

This nerve damage has been identified as the destruction of axons and neurons which is reversible at lower levels of toxicity. And irreversible at higher levels of Vitamin B6 toxicity.[xvii] [xviii]

Type of  Vitamin B6 to buy

Vitamin B6 from food and supplements comes in the form of Pyridoxine, Pyridoxal, and Pyridoxamine.

These forms of B6 are considered ‘inactive’, but are converted in your liver and intestines into the active form of Vitamin B6 called pyridoxal 5′-phosphate (P-5-P).

For nootropic use, look for a P-5-P supplement or a B-Complex formula that uses P-5-P.

Most multivitamins also include some form of Vitamin B6 in their formula. But many of these multis don’t contain enough for optimum health. And many have an inactive version of this nutrient.

The Performance Lab® NutriGenesis Multi offers a nature-identical form of Vitamin B6 and is now my favorite daily multivitamin/mineral supplement.

I prefer the Performance Lab® multi because it’s more potent, it’s biologically active and I’ve found to be a far more effective multi compared to every other multivitamin supplement I’ve ever used.

Performance Lab® uses their own priority NutriGenesis® vitamins and minerals which are grown on probiotic, plant and yeast cultures in a state-of-the-art lab.

Nootropics Expert Recommendation

Vitamin B6 as pyridoxal 5′-phosphate (P-5-P) up to 100 mg per day

Nootropics Expert Tested and ApprovedI recommend using Vitamin B6 as a nootropic supplement.

Your body does not make Vitamin B6 on its own. So to get its benefits you must get it from food, or take it as a supplement.

Vitamin B6 is especially helpful for those suffering from low energy levels, anxiety, depression, and chronic pain.

Experience shows Vitamin B6 helps stop and reverse the symptoms associated with high homocysteine levels. B6 in combination with folic acid and Vitamin B12 will lower high homocysteine implicated in heart disease and Alzheimer’s.

Vitamin B6 is also particularly helpful to students and executives who want to boost cognition, learning, memory and mood. Because it raises dopamine, GABA, norepinephrine, epinephrine and serotonin levels in your brain.

Vitamin B6 can help those dealing with ADHD because it helps synthesize dopamine and serotonin in your brain. ADHD symptoms should decline and you may be able to cut back on your ADHD meds.

Vitamin B6 is a must have addition for any nootropic stack. If you are using any nootropics to raise dopamine, GABA or serotonin levels, you absolutely need extra Vitamin B6.

At the very minimum every neurohacker should be using a multivitamin every day that includes Vitamin B6. The best multi I’ve found and use every day is the Performance Lab® NutriGenesis Multi for men or women.

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] Clayton P.T. “B6-responsive disorders: a model of vitamin dependency.” Journal of Inherited Metabolic Disease. 2006 Apr-Jun;29(2-3):317-26. (source)

[ii] Kennedy D.O. “B Vitamins and the Brain: Mechanisms, Dose and Efficacy—A Review” Nutrients. 2016 Feb; 8(2): 68. (source)

[iii] Percudani R., Peracchi A. “A genomic overview of pyridoxal-phosphate-dependent enzymes” EMBP reports 2003 Sep; 4(9): 850–854. (source)

[iv] Sakakeeny L., Roubenoff R., Obin M., Fontes J.D., Benjamin E.J., Bujanover Y., Jacques P.F., Selhub J. “Plasma pyridoxal-5-phosphate is inversely associated with systemic markers of inflammation in a population of U.S. adults.” Journal of Nutrition. 2012 Jul;142(7):1280-5. (source)

[v] Troesch B., Hoeft B., McBurney M., Eggersdorfer M., Weber P. “Dietary surveys indicate vitamin intakes below recommendations are common in representative Western countries.” British Journal of Nutrition. 2012 Aug;108(4):692-8 (source)

[vi] Douaud G., Refsum H., de Jager C.A., Jacoby R., Nichols T.E., Smith S.M., Smith A.D. “Preventing Alzheimer’s disease-related gray matter atrophy by B-vitamin treatment” Proceedings of the National Academy of Sciences USA vol. 110 no. 23 (source)

[vii] Malouf R., Grimley Evans J. “The effect of vitamin B6 on cognition.” Cochrane Database System Revue. 2003;(4):CD004393. (source)

[viii] Huang S.C., Wei J.C.C., Wu D.J., Huang Y.C. “Vitamin B6 supplementation improves pro-inflammatory responses in patients with rheumatoid arthritis” European Journal of Clinical Nutrition (2010) 64, 1007–1013 (source)

[ix] Smith A.D. “The worldwide challenge of the dementias: a role for B vitamins and homocysteine?” Food Nutrition Bulletin. 2008 Jun;29(2 Suppl):S143-72. (source)

[x] Ebben M., Lequerica A., Spielman A. “Effects of pyridoxine on dreaming: a preliminary study.” Perceptual and Motor Skills. 2002 Feb;94(1):135-40. (source)

[xi] De Lau L.M.L., Koudstaal P.J., Witteman J.C.M., Hofman A., Breteler M.M.B. “Dietary folate, vitamin B12, and vitamin B6 and the risk of Parkinson disease” Neurology July 25, 2006 vol. 67 no. 2 315-318 (source)

[xii] Mikawa Y., Mizobuchi S., Egi M., Morita K. “Low serum concentrations of vitamin B6 and iron are related to panic attack and hyperventilation attack.” Acta Medica Okayama. 2013;67(2):99-104. (source)

[xiii] Allen G.F., Neergheen V., Oppenheim M., Fitzgerald J.C., Footitt E., Hyland K., Clayton P.T., Land J.M., Heales S.J. “Pyridoxal 5′-phosphate deficiency causes a loss of aromatic L-amino acid decarboxylase in patients and human neuroblastoma cells, implications for aromatic L-amino acid decarboxylase and vitamin B(6) deficiency states.” Journal of Neurochemistry. 2010 Jul;114(1):87-96 (source)

[xiv] Morris M.S., Picciano M.F., Jacques P.F., Selhub J. “Plasma pyridoxal 5′-phosphate in the US population: the National Health and Nutrition Examination Survey, 2003-2004.” American Journal of Clinical Nutrition. 2008 May;87(5):1446-54. (source)

[xv] Parry G.J., Bredesen D.E. “Sensory neuropathy with low-dose pyridoxine.” Neurology. 1985 Oct;35(10):1466-8. (source)

[xvi] Dalton K., Dalton M.J. “Characteristics of pyridoxine overdose neuropathy syndrome.” Acta Neurologica Scandinavia. 1987 Jul;76(1):8-11. (source)

[xvii] Xu Y., Sladky J.T., Brown M.J. “Dose-dependent expression of neuronopathy after experimental pyridoxine intoxication.” Neurology. 1989 Aug;39(8):1077-83. (source)

[xviii] Perry T.A., Weerasuriya A., Mouton P.R., Holloway H.W., Greig N.H. “Pyridoxine-induced toxicity in rats: a stereological quantification of the sensory neuropathy.” Experimental Neurology. 2004 Nov;190(1):133-44. (source)

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Join The Discussion - 103 comments

August 12, 2021

is there a methylcobalamin version of B6 for MTHFR, I dunno if I have that mutation but I prefer active forms of vitamins

What type of B6 do I need to take that cant to be toxic in high amounts, so
like if I take B6 at 100MG daily then have a meal later without thinking and it’s also high in B6 what’s the best type to Avoid Overdose

    David Tomen
    August 12, 2021

    Benjamin, the natural, bioactive from of Vitamin B6 is called pyridoxal 5′-phosphate or P-5-P or short.

December 18, 2020

Why do I keep getting tingling whenever I take b6 20mg p5p? I don’t want nerve damage

    David Tomen
    December 20, 2020

    Shawn, Pyridoxine neuropathy has been reported in doses of Vitamin B6 of 200 mg to 5 grams per day for extended periods. When dosing was stopped, symptoms usually disappeared. But this was with synthetic B6 and not P-5-P.

    Try another reputable brand of P-5-P just to make sure you’re getting the real thing. If the tingling persists and it bothers you cut back on your dosage. You’re not going to experience nerve damage with 20 mg of any form of B6. But it sounds like it’s messing with your peace-of-mind. So try another brand.

Rosie Mead
November 5, 2020

Hi David – it was suggested to me that 1000mgs of B6/pyridoxine could help with essential tremor. It did help but I felt completely wiped out and couldn’t tolerate it. I am now considering Pyridoxal 5 Phosphate and wonder can you take less of it because it is bioactive and readily absorbed. In other words how many mgs of Pyridoxal 5 phosphate would you need to take to equal 1000mgs of B6/pyridoxine?

    David Tomen
    November 7, 2020

    Rosie, first 1,000 mg of standard pyridoxine is toxic and should NOT be used. Because it can result in Pyridoxine neuropathy. Symptoms are loss of coordination, extreme skin sensitivity, bone pain, muscle weakness, and numbness.

    P-5-P on the other hand is the natural form of Vitamin B6 and you cannot overdose it. But there is no benefit to using a dose higher than 100 mg per day.

    But essential tremor has also been linked to deficiencies in Vitamin B1 (thiamine), Vitamin B9 (folate), Vitamin B12 (methylcobalamin), Vitamin D and possibly magnesium deficiency.

    A very good B-Complex supplement with the correct forms of B-Vitamins is made by Life Extension ( Try a good Vitamin D3 supplement as well. And a chelated magnesium supplement such as this one:

      November 7, 2020

      Dear David
      Thank you so much for coming back to me. Your advice is really helpful and I will look at those products.

      Best wishes

Amy Natzke
October 13, 2020

David, thanks for this good article.

I have responded very well to P5P.

Ben Lynch and others have suggested that r5p, the active form of B2, is key to metabolizing P5P well. Do you concur? And do you have any guidance as to what the dosage ratio should be?

I use p5p as part of Susan C Owens’ protocol for excreting oxalates. It does help in this regard, and I was not expecting the clear boost in mood. I started at 6.5 mg and felt a difference right away. After a month or so the mood began to sag and I upped to 9 mg. Same thing happened. Now I am 12 mg and it is time to go up again. It is frustrating to keep going up, but it does seem very reliable. I just have to go slowly with these things. Again, Thanks. Amy

May 22, 2020

Hello Sir,

Can high doses of vitamin B3 (niacin) cause low levels of vitamin B6 in the body?


    David Tomen
    May 24, 2020

    Akash, negative. But low levels of Vitamin B6 prevents Vitamin B3 from working to synthesize Tryptophan.

Danny O
February 11, 2020

I’ve been taking a supplement recently called IP-6 Inositol, thinking it’s one thing, but it’s actually B6 & B8? Would it be best to take these separate, so I can up the Inositol part of it as needed?

    David Tomen
    February 14, 2020

    Danny, not sure why the manufacturer would combine those two. Use them separately if you need to depending on the benefit you’re looking for. Most people supplement with Myo-inositol anyway for its specific benefits.

October 8, 2019

I’ve been taking 100mg Pyridoxine for 3 weeks For histamine intolerance and it has helped enormously! Pain and inflammation reduced (no need for pain killers), energy increased and mood improved. I’m a bit concerned about long term use and nerve damage. Is 100mg a safe dose to take for continued use? Would you reduce the dose or take breaks now and again? It really feels like my body needs it with the positive results i’ve had so far. Thanks for the great article 🙂

    David Tomen
    October 8, 2019

    Mel, 100 mg of pyridoxine is considered safe and can be used long-term.

    Pyridoxine neuropathy which is a form of nerve damage is caused by high doses of Vitamin B6 when taken for extended periods. Clinical studies and other reports show doses of Vitamin B6 of 200 mg to 5 grams per day for extended periods is the problem. When dosing was stopped, symptoms usually disappeared.

    The safest way is to use the pyridoxal 5′-phosphate (P-5-P) form of Vitamin B6. It is the natural form of this vitamin and less likely to cause damage at higher doses. Either way everything that I’ve seen shows 100 mg is safe long-term.

Bryan McNamara
August 29, 2019

When B6 Pyridoxal is converted by the liver is it 1:1 or is some potency lost? In other words, how much Pyridoxal should I take to get 50mg of th eactive form?

    David Tomen
    August 29, 2019

    Bryan, as far as I can tell there is no way to know how much synthetic B6 is converted in your gut if any. And why it makes more sense to use the bio-identical P-5-P.

      December 11, 2021

      pyridoxal 5′-phosphate (P-5-P) form of Vitamin B6 What is the names of products that have this in them..such as even a acv gummie?

      thank you.

        David Tomen
        December 11, 2021

        Nancy, you have lots of options but fewer if you are concerned about purity. For example, you can get P-5-P in Mind Lab Pro (, the Performance Lab NutriGenesis Multi for women (, or a B-Complex like this one: But I am not aware of a pure gummie version of this vitamin.

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