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Vitamin B6 (P-5-P)

Mood · PMS · neurotransmitter synthesis

Strong evidenceVegan345 studies on PubMedRead the research
Written to our editorial standards · reviewed against published research· Updated 30 May 2026
Last reviewed: May 30, 2026

Vitamin B6: Mood · PMS · neurotransmitter synthesis. The active P-5-P form bypasses conversion bottlenecks. Cofactor for serotonin, dopamine, and GABA, directly supports mood and PMS. Standard dose 50 mg active P-5-P, taken in the morning, about $13/month. Evidence rating: strong evidence.

Where to buy

Pure Encapsulations P5P 50 (Pyridoxal 5' Phosphate)
Recommended
Pure Encapsulations, Vitamin B6
50 mg active P-5-P · Morning · ~$13/month

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All product options

Pure Encapsulations P5P 50 (Pyridoxal 5' Phosphate)Bestseller
P5P 50 (Pyridoxal 5' Phosphate)
Pure Encapsulations
60 capsules · $18 · ★ 4.8
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NOW Foods P-5-P 50 mg (active B6)Bestseller
P-5-P 50 mg (active B6)
NOW Foods
90 veg caps · $12 · ★ 4.7
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Thorne Pyridoxal 5-PhosphateBest Value
Pyridoxal 5-Phosphate
Thorne
180 capsules · $18 · ★ 4.7
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Doctor's Best P5P Active B6Premium
P5P Active B6
Doctor's Best
60 veg caps · $11 · ★ 4.6
Buy on iHerb →
Solgar P-5-P Pyridoxal-5-PhosphatePremium
P-5-P Pyridoxal-5-Phosphate
Solgar
100 caps · $15 · ★ 4.6
Buy on iHerb →

What is Vitamin B6?

Vitamin B6 in its active pyridoxal-5-phosphate (P-5-P) form is a critical cofactor for over 140 enzymatic reactions in the body, including the synthesis of every major neurotransmitter, serotonin, dopamine, norepinephrine, GABA, and melatonin. Standard B6 (pyridoxine HCl) requires liver activation to become P-5-P, a process that can be impaired by certain medications, age, or genetic variations. Direct P-5-P supplementation bypasses this bottleneck. Clinical research supports B6 for PMS symptoms, premenstrual mood changes, morning sickness, and homocysteine reduction. Standard doses range from 10-100 mg of P-5-P per day. Long-term high-dose use (above 200 mg) should be avoided due to neuropathy risk.

The active P-5-P form bypasses conversion bottlenecks. Cofactor for serotonin, dopamine, and GABA, directly supports mood and PMS.

Natural food sources

Where possible, get Vitamin B6 from whole foods first. Common dietary sources include:

ChickpeasTuna & salmonPoultryBananasPotatoes

Best for your goal

Interactions

Related biomarkers

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Common questions

What is Vitamin B6?
Vitamin B6 in its active pyridoxal-5-phosphate (P-5-P) form is a critical cofactor for over 140 enzymatic reactions in the body, including the synthesis of every major neurotransmitter, serotonin, dopamine, norepinephrine, GABA, and melatonin. Standard B6 (pyridoxine HCl) requires liver activation to become P-5-P, a process that can be impaired by certain medications, age, or genetic variations. Direct P-5-P supplementation bypasses this bottleneck. Clinical research supports B6 for PMS symptoms, premenstrual mood changes, morning sickness, and homocysteine reduction. Standard doses range from 10-100 mg of P-5-P per day. Long-term high-dose use (above 200 mg) should be avoided due to neuropathy risk.
What is Vitamin B6 used for?
Mood · PMS · neurotransmitter synthesis. The active P-5-P form bypasses conversion bottlenecks. Cofactor for serotonin, dopamine, and GABA, directly supports mood and PMS.
What is the standard dose of Vitamin B6?
50 mg active P-5-P, typically taken in the morning. Approximate cost is $13 per month.
How strong is the evidence for Vitamin B6?
Strong evidence for its primary uses. See the full study list on the research page.

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