What Is Biotin (B7)? Hair, Nails, Skin and the Facts to Know Before You Supplement

Biotin (vitamin B7) is heavily advertised for “beautiful hair, strong nails”, so many people buy it · But how much does biotin really help hair and nails, who actually needs to supplement, and what should you watch out for? · This article separates the facts from the advertising

Biotin is a water-soluble B vitamin that acts as a coenzyme in the metabolism of carbohydrates, fats and proteins · It is needed to make keratin (the protein of hair and nails), which is where the advertising comes from · But the key point is that most people are not deficient in biotin

1 Does biotin really help hair and nails?

• If you are truly biotin-deficient — supplementing can help with hair loss/brittle nails
• If you are not deficient — the evidence that extra supplementation makes hair thicker is still weak
• Deficiency is uncommon — because biotin is found in many foods and gut bacteria also make some

2 Important precautions

⚠️ High-dose biotin can interfere with blood test results — especially thyroid and some hormone tests, which may give inaccurate results · If you need a blood test, tell your doctor you are taking biotin; you may need to stop before the test

3 Which foods provide biotin?

1. Egg yolk (cooked), liver · good sources
2. Nuts, seeds
3. Salmon, sweet potato
4. Raw egg white in large amounts blocks biotin absorption (avidin) — cooked eggs are better

References

1. NIH Office of Dietary Supplements — Biotin Fact Sheet.
2. Patel DP, et al. A Review of the Use of Biotin for Hair Loss. Skin Appendage Disord.
3. FDA Safety Communication — Biotin interference with lab tests.

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