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
Vitamin B7 (Biotin) Dosage Guide
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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
| Condition | Recommended Dose | Evidence |
|---|---|---|
| General health | 30-100 mcg daily | Strong |
| Brittle nails | 2,500 mcg daily for 6+ months | Preliminary |
| Hair support | 2,500-5,000 mcg daily (limited evidence) | Preliminary |
| Pregnancy | 30-35 mcg daily as part of prenatal vitamin | Moderate |
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.
References
- Patel DP, Swink SM, Castelo-Soccio L (2017). A review of the use of biotin for hair loss. Skin Appendage Disorders. DOI PubMed
- FDA Safety Communication (2017). The FDA warns that biotin may interfere with lab tests. U.S. Food and Drug Administration.
- Colombo 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