What it is used for
- Treating and preventing biotin deficiency, which is uncommon
- Supporting people with rare inherited conditions affecting biotin use, under specialist care
- Commonly taken as a supplement for hair, skin and nail support, though evidence is limited
How it works
Biotin is a B vitamin that helps the body convert food into energy and supports healthy skin, hair and nails. True deficiency is rare, and supplementing corrects it; many people take it hoping to improve hair and nails, though the benefit in those without deficiency is uncertain.
How it is taken
Available as tablets, capsules, gummies and liquids, and is included in many multivitamins and hair-and-nail products. It can be taken with or without food. Take it exactly as the label or your pharmacist directs.
No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.
Common side effects
- Usually very well tolerated
- Mild stomach upset (uncommon)
Serious effects — get help
- No serious effects are typical at usual amounts
- Signs of an allergic reaction (rare)
If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.
Interactions to watch
- High-dose biotin can interfere with certain laboratory blood tests, including thyroid and heart tests, giving false results
- Some seizure medicines may lower biotin levels
Who should take care
- Tell your clinician and lab staff if you take biotin, as it can affect blood test results; you may be asked to stop it before testing
- Be cautious of very high-dose products marketed for hair and nails, as benefits are unproven
- Discuss use in pregnancy and breastfeeding with your clinician
- Choose reputable products and avoid stacking multiple supplements containing biotin