What it is
Biotin is a water-soluble member of the B-vitamin group, also known as vitamin B7. In cosmetics it is included at low levels as a skin-conditioning ingredient and as part of vitamin-themed formulas. It is a well-defined, stable molecule used as a minor functional additive rather than a primary active.
Safety & warnings
Biotin is a vitamin with a long record of safe dietary and topical use and is generally well tolerated on skin with no notable allergen or comedogenicity concerns at cosmetic levels.
Origin & sourcing
Can be produced by synthesis or fermentation; the cosmetic-grade material is a defined, purified compound.
Questions everyone asks
What is biotin in skincare?
It is vitamin B7, a water-soluble B-vitamin used at low levels as a skin-conditioning additive in cosmetics.
Does topical biotin affect hair or nails?
In a sunscreen it functions as a skin-conditioning additive; topical effects on hair or nails are not established cosmetic claims.