What it is & what it does
Keratin is a structural protein used in nail and hair formulas mainly for surface conditioning and film formation.
WHAT IT IS: Keratin is a structural protein naturally present in hair and nails, with cosmetic ingredients often supplying a processed or hydrolyzed form.
WHAT IT DOES / EVIDENCE: Topical keratin can form a conditioning film and may temporarily improve the feel and appearance of brittle hair or nails. The exact molecular size and processing matter. Applying keratin to skin or nails does not demonstrate that living nail growth or damaged proteins have been permanently rebuilt.
IN THE FINISHED FORMULA: The defensible benefit is cosmetic conditioning and surface appearance rather than biological regrowth. The actual function depends on raw-material identity and product design.
WHAT IT DOES / EVIDENCE: Topical keratin can form a conditioning film and may temporarily improve the feel and appearance of brittle hair or nails. The exact molecular size and processing matter. Applying keratin to skin or nails does not demonstrate that living nail growth or damaged proteins have been permanently rebuilt.
IN THE FINISHED FORMULA: The defensible benefit is cosmetic conditioning and surface appearance rather than biological regrowth. The actual function depends on raw-material identity and product design.
