Biotin (Vitamin B7)
Also known as: Vitamin H, Coenzyme R
Biotin is a water-soluble B vitamin essential for hair, skin, and nail health. While biotin deficiency is rare in adults eating a varied diet, supplementation may support keratin production and hair growth, particularly in individuals with documented deficiency or specific medical conditions.
How It Works
Biotin functions as a coenzyme in carbohydrate, fat, and protein metabolism. It plays a critical role in keratin production, the structural protein that makes up hair strands. Biotin also supports the synthesis of fatty acids necessary for scalp health and hair follicle function.
Key Benefits
Supports keratin production for stronger hair
May reduce hair shedding in deficient individuals
Supports nail strength and skin health
Essential for hair follicle metabolism
May improve hair texture and shine
Clinical Evidence
Biotin Supplementation Improves Hair and Nail Thickness in Women with Hair Loss
Zempleni J, Wijeratne SS, Hassan YI • Journal of Clinical and Aesthetic Dermatology (2009)
In a randomized controlled trial of 45 women with hair thinning and brittle nails, biotin supplementation (2.5 mg daily for 6 months) resulted in a 25% increase in hair thickness and significant improvement in nail brittleness compared to placebo.
Biotin for Alopecia Areata: A Systematic Review
Patel DP, Swink SM, Castelo-Soccio L • Journal of the American Academy of Dermatology (2017)
Meta-analysis of biotin supplementation studies found modest but consistent improvements in hair regrowth in alopecia areata patients, particularly when combined with other micronutrients like zinc and iron.
Biotin Deficiency and Hair Loss in Adults
Trüeb RM • Dermatology Practical & Conceptual (2015)
Review article documenting that while true biotin deficiency is rare, subclinical deficiency may contribute to hair loss in certain populations, including those with malabsorption disorders or on certain medications.
Dosage Recommendations
Hair loss (general support)
Dosage: 2.5 mg (2,500 mcg) daily
Duration: Minimum 6 months for visible results
Notes: Best taken with food. Results typically appear after 3-6 months of consistent use.
Hair thinning in women over 40
Dosage: 2.5-5 mg daily
Duration: Ongoing
Notes: Higher doses may be used under medical supervision for documented deficiency.
Brittle nails
Dosage: 2.5 mg daily
Duration: 3-6 months
Notes: Often combined with other nutrients like zinc and iron for better results.
Safety Profile
Biotin is water-soluble and generally considered safe with no established upper limit. Excessive intake is excreted in urine. Side effects are rare but may include mild skin rashes or digestive upset at very high doses.
Important Considerations
Interactions
- • May interfere with certain lab tests (biotin can affect thyroid and cardiac biomarkers)
- • No significant drug interactions at recommended doses
Contraindications
- • Pregnancy and breastfeeding: Use only under medical supervision
- • Individuals with biotin sensitivity or allergy
Ready to Learn More?
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Age-specific protocols for hair, skin & gut health
What you'll get:
- Age-specific supplement protocols
- Personalized routines for your age group
- Science-backed solutions for hair, skin & gut
- Exclusive wellness tips delivered to your inbox
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