Impact
Highest effect
Typical dose:1000–5000 mcg
Biotin (Vitamin B7) is a cornerstone of hair health due to its role in the body's keratin infrastructure. While true deficiency is rare, supplementation can help improve hair quality, thickness, and strength, especially in individuals with suboptimal levels.
- Focuses on
- Most relevant for
- Individuals with suboptimal biotin levels or hair thinning linked to specific nutrient-depleting medications.
Potential benefits
- Reduced hair shedding.A clinical trial using plant-based biotin extracts observed a significant reduction in hair fall over a 90-day period.
- Increased growth rate.Research on specific botanical biotin formulations suggests an increase in the daily rate of hair growth in healthy participants.
- Support for medication-induced loss.Unconfirmed. Biotin may help restore hair loss in specific cases where medications, such as certain anti-seizure drugs, impair biotin activity.
Limitations
- Inconsistent clinical evidence.Systematic reviews indicate that evidence for biotin improving hair in healthy individuals without deficiency remains sparse and unsubstantiated.
- Formulation specific results.Positive outcomes for hair growth were found using specific plant-derived extracts, which may not apply to all common biotin supplements.
- Primary benefit is deficiency-correction.Most documented improvements occur when biotin levels are impaired; it is not established as a dependable growth stimulant for those with adequate status.
Things to consider
Certain anti-seizure medications like valproic acid may lower biotin levels, potentially contributing to hair loss that biotin supplementation might address.
Study evidence
4 studiesBiotin may help hair problems linked to impaired biotin availability, but benefits for people without deficiency remain uncertain. Recent research on botanical biotin preparations is encouraging, yet it does not establish that ordinary biotin supplements reliably improve hair growth or quality.
View goal
