Biotin for Hair Growth
Evidence-Based Natural Remedy Guide
Effectiveness
Type
supplement
Sources
2 cited
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How Biotin Helps with Hair Growth
Biotin (vitamin B7) is essential for keratin production — the structural protein that makes up hair, skin, and nails. Biotin deficiency leads to hair thinning and loss, and supplementation can restore growth in deficient individuals.
🔬 What the Research Says
A 2017 systematic review in Skin Appendage Disorders analyzed 18 cases of biotin supplementation for hair and nail conditions and found improvement in all cases where there was an underlying biotin deficiency. A 2015 double-blind study found women with thinning hair who took a biotin-containing supplement had significantly increased hair growth.
[1] A review of biotin for hair loss — Skin Appendage Disorders (2017)
[2] Oral supplement for thinning hair in women — Journal of Clinical and Aesthetic Dermatology (2015)
📋 How to Use
Take biotin supplement with a meal for better absorption. Can be combined with other hair-supporting nutrients like zinc and iron. Results take 3-6 months as hair grows slowly.
💊 Recommended Dosage
2,500-5,000mcg (2.5-5mg) daily. The adequate intake is only 30mcg/day, but therapeutic doses for hair are much higher. Biotin is water-soluble so excess is excreted.
⚠️ Side Effects & Cautions
Generally very safe even at high doses. May interfere with certain lab tests (thyroid, troponin, vitamin D) — inform your doctor before blood work. Rare: skin breakouts in some individuals.
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Other Natural Remedies for Hair Growth
📚 Sources
- A review of biotin for hair loss — Skin Appendage Disorders (2017)
- Oral supplement for thinning hair in women — Journal of Clinical and Aesthetic Dermatology (2015)
Last reviewed: February 2026 · Medical disclaimer applies
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