Doctor's Best Biotin supports healthy hair, skin, and nails through biotin's essential role in keratin infrastructure — the structural protein matrix of hair, nails, and skin. Biotin (vitamin B7) is a water-soluble B vitamin that acts as a coenzyme in fatty acid synthesis and amino acid metabolism, both critical for the production of keratin. Available in two potencies: 5,000mcg (5mg) and 10,000mcg (10mg), allowing flexible dosing based on individual needs.*

• Biotin for healthy hair growth and thickness*
• Supports strong nails and reduction of brittleness*
• Supports healthy skin texture and appearance*
• Essential coenzyme for fatty acid and amino acid metabolism*
• Available in 5,000mcg and 10,000mcg potencies
• Non-GMO | Gluten Free | Vegan | 120 veggie capsules

Suggested Use: Take 1 capsule daily with a meal.

Frequently Asked Questions

Does biotin really help with hair loss and growth?

Biotin deficiency is associated with hair loss and brittle nails. For those deficient in biotin, supplementation can result in visible improvements in hair thickness, growth rate, and nail strength. However, if biotin levels are already sufficient, high-dose supplementation may have more modest effects. The benefits are most pronounced in those with underlying biotin insufficiency.*

What is the difference between 5,000mcg and 10,000mcg biotin?

Both potencies support hair, skin, and nail health. The 5,000mcg dose is suitable for general daily supplementation and maintenance. The 10,000mcg dose is a clinical-strength potency often recommended for individuals with brittle nails, hair thinning, or those seeking more intensive supplementation. Both are safe as biotin is water-soluble and excess is excreted through urine.*

Does high-dose biotin interfere with blood tests?

Yes — this is important. High-dose biotin (particularly 5,000mcg and above) can interfere with many immunoassay blood tests including thyroid function tests, troponin (heart attack marker), and hormone panels, causing falsely high or falsely low results. Stop taking biotin at least 2–3 days before any blood test and inform your doctor or laboratory that you have been taking biotin.*

Can I take Doctor's Best Biotin with other hair and nail supplements?

Yes. Biotin works well alongside collagen peptides, silica, zinc, and vitamin C for comprehensive hair and nail support. Check for biotin in any other supplements you are taking (particularly multivitamins and hair formulas) to avoid unintentionally high doses that could affect blood test results.*