active
Collagen
Ubiquitous anti-ageing active in K-beauty PDRN serums. The topical collagen question — whether hydrolysed fragments stimulate endogenous collagen — remains scientifically contested.
Benefits
- Humectant function via water-binding peptides
- Film-forming on skin surface
- May stimulate endogenous collagen synthesis via receptor interaction at low MW
- Moisturising and skin-feel improvement
- Marine-sourced variants popular in K-beauty
Example uses
- Anti-ageing serums
- PDRN combination formulas
- Sheet masks
- Spray mist formulations
- Firming body lotions
Mechanism of action
Hydrolysed collagen peptides bind DDR1/DDR2 receptors and integrins at sufficient concentrations, triggering upstream collagen synthesis at very low MW. Surface-deposited higher-MW fragments function as humectants and temporary film-formers without endogenous collagen stimulation.
Clinical evidence · Moderate
Multiple in vitro and some controlled clinical studies for low-MW collagen peptides. Most clinical data is for oral collagen and is frequently misappropriated for topical claims.
Effective concentration range
0.1–5%
Formulation notes
MW dictates penetration depth — <3 kDa fragments may penetrate into viable epidermis. Standard hydrolysed collagen (10–100 kDa) functions at skin surface.
Watchouts
Intact collagen cannot penetrate the skin barrier. Marketing routinely overstates topical collagen's relationship to dermal collagen.
Controversies & overclaims
Topical vs. oral collagen evidence conflation is endemic in beauty marketing. Claims of direct dermal collagen replenishment are not supported for standard MW hydrolysed collagen.
Market positioning
Sold as dermal collagen replenishment. Overstates what topical application achieves. More defensible positioning: humectant and potential fibroblast signalling at low MW.
Comedogenicity
0 / 5
Sensitisation risk
Low
INCI & aliases
Hydrolyzed Collagen
hydrolyzed collagen · soluble collagen · marine collagen peptides
Clean beauty perception
Widely embraced in clean beauty and K-beauty. Consumer perception of efficacy significantly exceeds scientific evidence for topical application.
Related ingredients
Graph relationships
Timeline