Vitamin B6
vitamins
Vitamin B6 (pyridoxine) is an essential water-soluble vitamin critical for amino acid metabolism, neurotransmitter synthesis, and immune function. It plays a vital role in energy production and haemoglobin formation, making it fundamental to neurological and cardiovascular health.
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Benefits
Dosage
Typical Dose
1.3–2.0 mg daily for adults
Upper Limit
100 mg daily (long-term safe limit)
Timing
With meals to enhance absorption; no specific time-dependent advantage
Forms & Bioavailability
Pyridoxine HCl
Standard form; readily absorbed but requires conversion to active pyridoxal-5-phosphate in the body
Pyridoxal-5-Phosphate (P5P)
Active form; superior bioavailability and directly utilised without hepatic conversion
Pyridoxamine
Natural form found in food; good absorption and antioxidant properties
Side Effects
Interactions
Research Summary
Research demonstrates that B6 supplementation effectively reduces homocysteine levels and supports cardiovascular health, with particular efficacy in treating premenstrual syndrome. Studies confirm its essential role in neurotransmitter synthesis and immune regulation, though high-dose supplementation beyond recommended levels carries risk of peripheral neuropathy. Evidence supports the superiority of P5P form for individuals with compromised hepatic function or genetic methylation issues.
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The Bottom Line on Vitamin B6
Vitamin B6 is well-researched with strong evidence supporting its primary benefits.It is most commonly used for supports neurotransmitter synthesis including serotonin and dopamine and enhances immune function and antibody production. As with any supplement, individual results vary. Start with the lower end of the dosage range and assess for 4-8 weeks before adjusting.
About Our Research
This profile is compiled from peer-reviewed research published on PubMed, the NIH Office of Dietary Supplements, and established nutritional science databases. Dosages reflect clinically-studied amounts from human trials where available. We update profiles as new research emerges. This is not medical advice — consult a healthcare professional before supplementing.
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Goal Guides for Vitamin B6
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