Cosmetic peptide
Heptapeptide 21
Heptapeptide 21 is used or marketed in topical cosmetic formulations, with peptide-specific clinical evidence that is limited or formulation-dependent.
Evidence confidence
Human
Not yet assessed
Trust Engine review pending.
Animal
Not yet assessed
Trust Engine review pending.
Mechanistic
Not yet assessed
Trust Engine review pending — see editorial links below.
Editorial evidence links exist, but this category has not yet completed Trust Engine assessment.
Safety
Not yet assessed
Trust Engine review pending.
Claimed uses
- Insufficient
Mechanisms
- not-yet-documented
- Collagen synthesis
Safety notes
Topical irritation or sensitisation is possible. Ingredient-specific long-term safety data are limited.
Regulation
- Cosmetic ingredient or product component; not an approved medicine.
Last reviewed
12 July 2026