Benefits of Vitamin B6 (Pyridoxine)

Evidence-Based Benefits

• Morning sickness — vitamin B6 (pyridoxine) at 10-25 mg three times daily is first-line treatment for pregnancy nausea; the combination of doxylamine + pyridoxine (Diclegis/Bonjesta) is FDA-approved and reduced nausea by 70% vs placebo in RCTs
• Neurotransmitter production — PLP is required for the synthesis of serotonin (from tryptophan), dopamine, GABA, and norepinephrine; deficiency is associated with depression, irritability, and confusion
• PMS relief — a 1999 BMJ systematic review of 9 RCTs (n=940) found B6 at 50-100 mg/day significantly reduced PMS symptoms including depression, irritability, and bloating compared to placebo
• Homocysteine metabolism — B6 (with B12 and folate) is required for the transsulfuration pathway that converts homocysteine to cysteine; supplementation reduces elevated homocysteine, a cardiovascular risk factor

What the Research Says

Vitamin B6 has strong evidence for morning sickness treatment, with the ACOG recommending pyridoxine (10-25 mg, 3 times daily) as first-line therapy. The FDA-approved combination of doxylamine/pyridoxine (Diclegis) is supported by multiple RCTs. Wyatt et al. (1999) published a BMJ systematic review of 9 RCTs demonstrating B6 at 50-100 mg/day significantly improved PMS symptoms. For neurology, Hvas et al. (2004) showed that B6 supplementation improved mood in subjects with marginal B6 deficiency. The neuropathy risk at chronic high doses (>200 mg/day) is well-documented and led to the 100 mg/day UL.

Related Conditions