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Vitamin B6 (Pyridoxine/P-5-P)
Cofactor in 100+ enzyme reactions including serotonin, dopamine, and GABA synthesis — also lowers homocysteine levels.
What the evidence says
Vitamin B6 appears to help in 9 of 11 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1999–2026 with a typical study size of 478 participants.
Based on 41 studies · 14 meta-analyses · 13 RCTs · 210,832 total participants
Confidence
HighWhat the studies found
By outcome
See full supplement plans that include Vitamin B6.
Vitamin B6 has an evidence score of 9/10 — very strong evidence based on 39 indexed studies, including 13 meta-analyses. Cofactor in 100+ enzyme reactions including serotonin, dopamine, and GABA synthesis — also lowers homocysteine levels.
The commonly studied dose of Vitamin B6 is 25-100mg daily. Research points to an estimated optimal dose around 75mg, with a minimum effective dose near 25mg. Individual response varies — start low and adjust.
The best time to take Vitamin B6 is in the morning. Taking it with food is preferred. Vitamin B6 is a coenzyme for over 150 enzymatic reactions including neurotransmitter synthesis (serotonin, dopamine, GABA, norepinephrine), amino acid metabolism, and glycogen phosphorylase activity.
Vitamin D3
Probably helpsHormone-like vitamin that regulates 1,000+ genes — deficiency is widespread and linked to poor immunity, depression, and bone loss.
Myo-Inositol
Probably helpsFirst-line natural treatment for PCOS that improves insulin sensitivity and ovulation — also reduces anxiety, panic, and OCD symptoms.
Last reviewed May 2026 · evidence from 40 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Vitamin B6 is involved in more bodily functions than almost any other nutrient, participating in over 100 enzyme reactions. It's crucial for neurotransmitter synthesis (serotonin, dopamine, GABA), immune function, and homocysteine metabolism. P-5-P (pyridoxal-5-phosphate) is the active form that doesn't require liver conversion.
Required for serotonin, dopamine, GABA production
Helps convert homocysteine to cysteine
Supports lymphocyte production and function
How Vitamin B6 works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Tap node to isolate • Pinch to zoom • Tap edge for research
25-100mg daily
Loading: Not required; stay under 100mg/day long-term
Take with food
| Form | Type |
|---|---|
| 💊P-5-P (Pyridoxal-5-Phosphate) | Recommended |
| 💊Pyridoxine HCl (standard form) | Alternative |
P-5-P is the active form and doesn't require liver conversion. Standard pyridoxine is effective for most people.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: P-5-P (active form) may be better for those with liver issues or certain genetic variants.
Based on systematic review of nutritional interventions for PMS psychological symptoms. Evidence quality limited by study heterogeneity and need for more consistent protocols.
Improved mood and reduced anxiety
Reduced PMS symptoms including mood swings
Chronic high doses can cause nerve damage
Well-studied for PMS relief at 50-100mg/day
B6 can reduce levodopa effectiveness
Tip: Keep doses under 200mg/day; avoid long-term high doses
Vitamin B6 is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are peripheral neuropathy. Use caution if any of these apply to you: Known allergy or hypersensitivity to Vitamin B6 or related compounds; Pre-existing neuropathy (high doses can worsen nerve damage).
Omega-3
Probably helpsEssential fatty acids critical for brain health, mood regulation, and reducing inflammation throughout the body.