Keratin Peptides
Broken-down keratin protein fragments that coat and reinforce damaged hair shafts.
Back to all peptides
Spotted this on a label?
Keratin-derived peptides
That’s the INCI name—the official way it appears on the back of your serum or cream. Same ingredient, different marketing names.
Structure (cute edition)
This peptide is a short chain of about 4 amino acids—think of it as a tiny protein necklace on your label.
INCI: Keratin-derived peptides · ~4 amino acids in our simplified view
What brands say it does
Hydrolyzed keratin peptides are small enough to penetrate the cuticle and fill gaps in damaged hair. They improve feel and reduce breakage rather than growing new follicles. Common in bond-repair and smoothing lines.
Where you’ll find it
Bond builders, leave-in conditioners, heat protectants, and salon keratin treatments.
Other names you might see
Hydrolyzed keratin
Keratin amino acids
Keratin-derived peptides
Educational only—not medical advice. Hair loss has many causes; see a dermatologist or trichologist for persistent thinning.