Vitamin B6 Dosage Guide
Recommended daily intake by age and gender — based on NIH Dietary Reference Intakes.
Our assessment
Based on FDA data, vitamin B6 has a narrow safety window that requires careful monitoring. While the body rarely accumulates toxic levels from food sources, long-term supplementation at high doses carries a well-documented risk of severe nerve damage NIH ODS ↗. This is the most critical finding: taking high amounts of vitamin B6 from supplements for a year or longer can cause severe nerve damage, leading people to lose control of their bodily movements NIH ODS ↗. The symptoms usually stop when they stop taking the supplements NIH ODS ↗.
Safety profile
FDA data on adverse events for vitamin B6 is limited, but the established risks from high-dose, long-term use are serious. Other symptoms of too much vitamin B6 include painful, unsightly skin patches, extreme sensitivity to sunlight, nausea, and heartburn NIH ODS ↗. The daily upper limits for vitamin B6 include intakes from all sources, meaning supplements plus food must be accounted for to stay within safe ranges NIH ODS ↗.
How it works
Data not available for mechanism of action from provided data. The critical safety concern is that vitamin B6 supplements can interact or interfere with medicines that you take NIH ODS ↗. Specifically, vitamin B6 supplements might interact with cycloserine (Seromycin), an antibiotic used to treat tuberculosis, and worsen any seizures and nerve cell damage that the drug might cause NIH ODS ↗.
Our recommendation
Avoid taking high doses of vitamin B6 supplements for extended periods. Anyone using cycloserine for tuberculosis should be especially cautious, as the combination may worsen seizures and nerve cell damage NIH ODS ↗. If you experience loss of bodily control, painful skin patches, extreme sensitivity to sunlight, nausea, or heartburn, stop supplementation and consult a healthcare provider immediately NIH ODS ↗. Always stay within the daily upper limits, which include intake from all dietary sources NIH ODS ↗.
AI-assisted analysis. Data sourced from NIH ODS.
Understanding RDAs
Dietary Reference Intakes (DRIs) are a set of reference values used to plan and assess nutrient intakes of healthy people. They include:
- RDA (Recommended Dietary Allowance) — The average daily intake sufficient to meet the nutrient requirements of nearly all (97-98%) healthy individuals.
- AI (Adequate Intake) — Established when evidence is insufficient to develop an RDA. Based on observed nutrient intake by healthy people.
- UL (Tolerable Upper Intake Level) — The maximum daily intake unlikely to cause adverse health effects. Exceeding the UL increases the risk of toxicity.
Values vary by age, gender, and life stage (pregnancy, lactation).
Source: National Academies of Sciences, Engineering, and Medicine
Recommended Dietary Allowance
| Life Stage | Recommended Amount |
|---|---|
| Birth to 6 months | 0.1 mg |
| Infants 7–12 months | 0.3 mg |
| Children 1–3 years | 0.5 mg |
| Children 4–8 years | 0.6 mg |
| Children 9–13 years | 1.0 mg |
| Teens 14–18 years (boys) | 1.3 mg |
| Teens 14–18 years (girls) | 1.2 mg |
| Adults 19–50 years | 1.3 mg |
| Adults 51+ years (men) | 1.7 mg |
| Adults 51+ years (women) | 1.5 mg |
| Pregnant teens and women | 1.9 mg |
| Breastfeeding teens and women | 2.0 mg |
Source: National Academies of Sciences, Engineering, and Medicine