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Head-to-head evidence comparison — which supplement is right for you?
Retinol wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Matrixyl and Retinol have evidence — compare verdict strength side-by-side.
Topical cosmetic only. Matrixyl (palmitoyl pentapeptide-4 / pal-KTTKS, or the Matrixyl 3000 blend of palmitoyl tripeptide-1 + palmitoyl tetrapeptide-7) is used at very low concentrations in leave-on serums and creams — clinical benefit was shown at as little as 3 ppm pal-KTTKS, and consumer products commonly list 3-10% of the branded blend. Applied to the target area once or twice daily. There is no oral, injectable, or systemic dose — it is not ingested.
any
Leave-on topical cosmetic (serum or cream) containing palmitoyl pentapeptide-4 or the Matrixyl 3000 blend
Topical cosmetic only. OTC retinol is formulated roughly 0.1-1% in leave-on serums or creams and applied to clean, dry facial skin at night, starting 2-3 nights per week and building to nightly as tolerated. There is no oral, injectable, or systemic dose — this is not ingested. Higher concentrations work somewhat better but irritate more; pair with a moisturizer and a morning sunscreen. This library does not provide an ingestion protocol.
evening
Leave-on topical serum or cream (0.1-1% retinol)
Throughout
8-12 weeks
Cell studies
Throughout
Throughout
8-24 weeks
8-24 weeks
Throughout
Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin.
Int J Cosmet Sci (2005) · Rct
The strongest human evidence: a 12-week, double-blind, placebo-controlled, split-face, left-right randomized trial in 93 women aged 35-55 (Procter & Gamble)
Double-blind, Randomized Trial on the Effectiveness of Acetylhexapeptide-3 Cream and Palmitoyl Pentapeptide-4 Cream for Crow's Feet.
J Clin Aesthet Dermatol (2023) · Rct
Double-blind randomized trial in 21 Indonesian women applying palmitoyl pentapeptide-4 (PPP-4) cream, acetyl hexapeptide-3 cream, or placebo twice daily for 8 weeks
Dermal Stability and In Vitro Skin Permeation of Collagen Pentapeptides (KTTKS and palmitoyl-KTTKS).
Biomol Ther (Seoul) (2014) · In vitro
In-vitro stability and permeation study in hairless-mouse skin comparing KTTKS with its palmitoylated derivative pal-KTTKS (Matrixyl)
Improvement of naturally aged skin with vitamin A (retinol).
Arch Dermatol (2007) · Rct · n=36
Randomized, double-blind, vehicle-controlled left/right-arm study: 0.4% retinol lotion vs vehicle applied up to 3x/week for 24 weeks in 36 elderly subjects (mean age 87)
A stabilized 0.1% retinol facial moisturizer improves the appearance of photodamaged skin in an eight-week, double-blind, vehicle-controlled study.
J Drugs Dermatol (2009) · Rct · n=64
Eight-week, double-blind, split-face, randomized study: stabilized 0.1% retinol moisturizer (36 subjects) vs vehicle (28 subjects) in women with moderate facial photodamage
Comparative efficacy of topical interventions for facial photoaging: a network meta-analysis.
Sci Rep (2025) · Meta analysis
Systematic review and Bayesian network meta-analysis of 23 RCTs (3905 participants) of topical anti-photoaging agents
Retinol has a higher evidence score (5/10 vs 3/10) and wins in 2 of 3 categories.
For reduce wrinkles & fine lines, Retinol has a higher relevance score (75 vs 60).
No known interactions between Matrixyl and Retinol have been documented in our database. However, always consult a healthcare provider before combining supplements.