Vitamin B6 Safety in Pregnancy

Critical Safety Thresholds

The European Food Safety Authority's upper tolerable limit is 100 mg/day for adults, and even this level has been associated with toxicity in susceptible individuals 1
Toxicity has been documented with prolonged intake of just 100 mg/day 1
The recommended daily intake for adults is only 1.3-1.7 mg/day, according to the European Food Safety Authority 1, 2
Even "low-dose" supplementation of 6-40 mg/day has caused toxicity in case reports, highlighting the need for caution 1

Chronic intake exceeding 100 mg/day causes sensory neuropathy, as reported by the European Food Safety Authority 2
Grade 3-4 neurological impairments require longer recovery periods than grade 1-2 symptoms, emphasizing the importance of prompt medical attention 1

The American College of Obstetricians and Gynecologists recommends starting with 10 mg orally every 8 hours for mild to moderate symptoms of nausea and vomiting in pregnancy 2
The maximum recommended dose is 25 mg three times daily (75 mg total daily), as suggested by the American College of Obstetricians and Gynecologists 2
Combination therapy with doxylamine and vitamin B6 may be considered if monotherapy is insufficient, according to the American College of Obstetricians and Gynecologists 2

The Centers for Disease Control and Prevention recommends pyridoxine supplementation at 25-50 mg/day for patients taking tuberculosis medications, increased to 100 mg/day only if peripheral neuropathy develops 1
The American Thoracic Society suggests pyridoxine supplementation (25 mg/day) during pregnancy for women taking isoniazid, highlighting the importance of careful dosing 3