Vitamin B6 (Pyridoxine)
vitamin
ApprovedGeneral information about nutrients. No diagnosis, no medical advice. If you take medication, are pregnant or have a medical condition, talk to your doctor before taking supplements.
Overview
Water-soluble B vitamin involved in over 100 enzyme reactions, primarily in protein metabolism. Vitamin B6 contributes to normal functioning of the nervous system.
Interactions
Magnesium is required for the phosphorylation of pyridoxine to its active form PLP (pyridoxal-5-phosphate). Mg deficiency impairs B6 activation.
Research status
Vitamin B6 contributes to normal homocysteine metabolism.
Top 5 food sources
Expert opinions
NIH
The NIH UL of 100 mg/day for vitamin B6 reflects case reports of sensory peripheral neuropathy at sustained intakes of 200–500+ mg over months to years, first described by Schaumburg in the 1980s. The neuropathy is usually reversible on discontinuation but can persist in severe cases. The risk appears lower — but not zero — for the activated P-5-P form, and nonexistent at dietary levels. RDA is 1.3–1.7 mg, but needs rise with high-protein diets, oral contraceptives, and pregnancy. B6 status is best assessed by plasma PLP (pyridoxal-5-phosphate); serum B6 alone can mislead when supplementing pyridoxine HCl.
Recommended dose: 1.3–1.7 mg
Source: NIH
Dr. Strunz
Strunz prescribes B6 exclusively as the bioactive P-5-P (pyridoxal-5-phosphate) form, 25 to 50 mg daily, because roughly 30 % of the population has SNPs in PNPO or alkaline phosphatase that impair conversion from pyridoxine HCl. P-5-P is the direct cofactor for over 100 enzymes. Vitamin B6 contributes to normal homocysteine metabolism. He screens plasma PLP rather than serum B6, and keeps chronic doses at or below 50 mg to avoid the neuropathy window.
Recommended dose: 25–50 mg
Source: Dr. Strunz
Expert profiles summarise publicly available statements. The named people do not cooperate with Stackwell and have not authorised these summaries. Not medical advice.
Active P-5-P form preferred. Long-term doses above 100mg need monitoring.