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Vitamin B7 (Biotin) Dosage Guide

Evidence:Moderate
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

General Dosage

30 mcg daily as Adequate Intake (AI); 2,500-5,000 mcg in supplements for hair/nail support

Maximum dose: No established upper limit; doses up to 200 mg/day used in biotinidase deficiency without adverse effects

Dosage Recommendations

General recommendation: 30 mcg daily as Adequate Intake (AI); 2,500-5,000 mcg in supplements for hair/nail support

Timing: Any time of day; consistent daily use recommended

Dosage by Condition

General health
30-100 mcg dailyStrong
Brittle nails
2,500 mcg daily for 6+ monthsPreliminary
Hair support
2,500-5,000 mcg daily (limited evidence)Preliminary
Pregnancy
30-35 mcg daily as part of prenatal vitaminModerate

Upper limit: No established upper limit; doses up to 200 mg/day used in biotinidase deficiency without adverse effects

Timing & Absorption

Any time of day; consistent daily use recommended

Can be taken with or without food.

Full Vitamin B7 (Biotin) Guide

References

  1. ReviewPatel DP, Swink SM, Castelo-Soccio L (2017). A review of the use of biotin for hair loss. Skin Appendage Disorders. DOI PubMed
  2. FDA Safety Communication (2017). The FDA warns that biotin may interfere with lab tests. U.S. Food and Drug Administration.
  3. ObservationalColombo VE, Gerber F, Bronhofer M, Floersheim GL (1990). Treatment of brittle fingernails and onychoschizia with biotin: scanning electron microscopy. Journal of the American Academy of Dermatology. DOI PubMed