Biotin Benefits
- Supports skin conditioning as part of a formula's broader profile
- Corrects deficiency related skin, hair, and nail symptoms when a true deficiency is present
- Plays a supporting role in the body's broader metabolic processes
- Generally well tolerated across skin types
Biotin Description
Biotin, also called vitamin B7, functions in the body as a cofactor for enzymes involved in metabolizing fats, carbohydrates, and proteins, several of which play a role in maintaining healthy skin, hair, and nails.
Its popular reputation for improving hair and nail strength comes almost entirely from research on people with an actual biotin deficiency, a relatively rare condition, since clinical documentation of biotin deficiency has found it can produce a distinct, scaly, red rash along with hair thinning, meaning topical or oral biotin genuinely helps correct these specific symptoms when a true deficiency exists.
A dermatology literature review examining the broader evidence for biotin supplementation found little support for benefit in people who are not deficient, concluding that its role in most skincare formulas is better understood as a general conditioning ingredient than a proven standalone treatment.
Biotin References
Rethinking Biotin Therapy for Hair, Nail, and Skin Disorders, Journal of the American Academy of Dermatology, 2018
Skin Manifestations of Biotin Deficiency, 1991
Written by Elle Layne
Ingredient Ratings
Our team reviews ingredient research and uses up-to-date evidence to rate ingredients based on the categories below.
Best
Ingredients with the most rigorous and convincing evidence. These are the standouts backed by consistent findings across independent, peer reviewed clinical research.. When we call an ingredient Best, it has earned that distinction through genuine, reproducible proof that it improves skin.
Good
Reliable, well tolerated ingredients that do their job without complaint. They may not carry the headline benefits of a Best rated active, but they hydrate, stabilize a formula, or support the ingredients around them in ways that make a real difference in how a product performs and feels.
Average
Ingredients that are perfectly safe and serve a clear function, typically as an emollient, thickener, or filler, but do not offer any meaningful skin benefit beyond that basic job. Not a red flag, just not a reason to choose one product over another.
Bad/Worst
Ingredients with documented potential to irritate skin, disrupt the barrier, or trigger sensitization in some users, often synthetic fragrance, drying forms of alcohol, or certain essential oils. Not automatically a dealbreaker for every skin type, but worth knowing about before you commit to a product.