A cosmetic signal peptide designed for creams and serums. One 12-week split-face trial found modest wrinkle improvement. It is a topical ingredient, not an injectable, even when sold as a lyophilized "research" vial.
How strong is the human evidence?
- Cell & animal
- Small human studies
- Some randomized trials
- Large randomized trials
What is Matrixyl?
Original Matrixyl is palmitoyl pentapeptide-4: the five-amino-acid procollagen fragment KTTKS with a fatty-acid (palmitoyl) tail added to help it interact with skin.
Matrixyl 3000 is a different blend (palmitoyl tripeptide-1 plus palmitoyl tetrapeptide-7).
Is Matrixyl legal in Canada?
Sold legally as a cosmetic ingredient in skin care. Health Canada classifies products by intended purpose and claims. It has no authorized use as an injectable drug.
What the research shows
- Robinson et al. (Int J Cosmet Sci 2005): 93 women, 12 weeks, double-blind split-face; a moisturizer with palmitoyl pentapeptide improved wrinkle and fine-line measures vs the same moisturizer without it. The study was run by the manufacturer of a consumer product and the effect was modest.
- The Cosmetic Ingredient Review panel's 2024 final report concluded palmitoyl pentapeptide-4 is safe in cosmetics at current use concentrations.
What it doesn't show
- No evidence for injection; cosmetic safety assessments cover very low concentrations in creams.
- No dose-ranging evidence that stronger concentrations work better.
Common questions
Is Matrixyl topical only?
Yes. It was designed and tested as a topical cosmetic ingredient. A lyophilized vial format doesn't make it injectable.
Matrixyl vs retinol?
Retinoids have more clinical evidence; Matrixyl's evidence base is smaller.
Can you use Matrixyl and retinol together?
Many products combine peptides and retinoids. If irritation is a concern, ask a pharmacist or dermatologist.
Sources
- Robinson LR et al. Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin. Int J Cosmet Sci 2005
- Cosmetic Ingredient Review — Final report on pentapeptides (2024)
- Health Canada — Classification of products at the cosmetic-drug interface
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