Palmitoyl Tripeptide-38 vs Tripeptide-10 Citrulline
Comprehensive side-by-side comparison of mechanisms, dosing, side effects, and research
Also: Matrixyl synthe'6, Matrixyl Synthe 6
Palmitoyl tripeptide-38 is the active in Sederma's Matrixyl synthe'6, a newer member of the Matrixyl family launched around 2011. It is a three-amino-acid fragment with a fatty acid tail, sold as a wrinkle 'filler from the inside' for forehead lines and crow's feet. It is a cosmetic ingredient, not a drug, and the honest picture is simple: the efficacy claims come almost entirely from the company that makes it.
Also: Decorinyl, Decorin-like tetrapeptide
Tripeptide-10 citrulline, sold as Decorinyl, is a small synthetic peptide (four residues, despite the name) designed by the Spanish ingredient maker Lipotec to mimic decorin, a protein that keeps collagen fibers neat and evenly sized. The pitch is better collagen, not more collagen. It is a cosmetic ingredient, not an FDA-approved drug, and almost all of the evidence comes from the company that makes it.
Key Comparison Insights
- Both peptides belong to the Skin & Hair category, suggesting similar primary applications.
Detailed Comparison
| Attribute | Palmitoyl Tripeptide-38 | Tripeptide-10 Citrulline |
|---|---|---|
| Category | Skin & Hair | Skin & Hair |
| FDA Status | Not FDA Approved | Not FDA Approved |
| Clinical Status | Pre I II III IV FDA | Pre I II III IV FDA |
| Mechanism of Action | The peptide is Pal-Lys-Met(O2)-Lys: lysine, an oxidized methionine (methionine sulfone) and lysine, with a palmitic acid chain attached so it can get into the outer skin more easily. The sequence is taken from connective tissue proteins (collagen VI and laminin), and the idea is the classic 'matrikine' story: small fragments of broken-down matrix proteins act as a signal telling skin cells to make more matrix. Sederma claims it boosts six components in lab tests, which is where the 'synthe'6' name comes from: collagen I, III and IV, fibronectin, hyaluronic acid and laminin-5. That is a plausible signaling mechanism, but it rests on cell culture work by the manufacturer. Whether enough peptide reaches the dermis in real skin to make a measurable difference has not been independently shown. | Decorin sits on collagen fibrils and controls how thick they grow and how tightly they pack. With age, decorin activity drops, and collagen fibers become uneven and disorganized, which is part of why older skin loses suppleness. Lipotec researchers took the two short sequences decorin uses to grab collagen, built a library of tetrapeptides around them, and screened them in a test-tube collagen assembly assay. The winner, tripeptide-10 citrulline, made fibrils thinner and more uniform in that assay. The idea is that a well-organized collagen network is more cohesive and supple. Whether a topical cream delivers enough peptide to the dermis to do this in real skin has not been independently shown. |
| Common Dosing | 2% of the commercial ingredient in a finished product Once or twice daily | Around 0.01% peptide in a finished product Once or twice daily |
| Administration | Topical (serums, creams) | Topical (serums, creams) |
| Typical Duration | About 2 months in the manufacturer's study before changes were measured; ongoing use to keep any effect | Studies ran 2 months (60 days); ongoing use for maintained effects |
| Best Time to Take | Morning and/or evening, on clean skin before moisturizer | Morning and/or evening skincare routine |
Possible Side Effects May vary by individual |
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| Research Summary | There is no independent, peer-reviewed clinical trial of palmitoyl tripeptide-38 on its own that we could find. The main human data is the manufacturer's: a placebo-controlled study in 25 women aged 42 to 70 with forehead lines and crow's feet, using 2% of the Matrixyl synthe'6 ingredient for two months, with reported reductions in wrinkle measures that ranged widely between people. Sederma's launch material in 2011 described visibly smoother forehead and crow's feet wrinkles after two months but gave no published sample sizes or numbers. Where the peptide shows up in published journals, it is usually as one ingredient in a multi-ingredient serum, which cannot isolate its effect. Broader reviews of cosmetic peptides make the same point about this whole category: results are often small, short and unpublished outside company brochures. A 2026 meta-analysis of randomized peptide trials found that topical peptides overall did not produce a significant wrinkle improvement in pooled data. Bottom line: a reasonable, well-tolerated ingredient with a plausible mechanism, but expect mild changes at best and treat the percentage claims as marketing until someone outside the company repeats them. | The founding paper is Puig, Garcia Anton and Mangues (Lipotec) in the Journal of Cosmetic Science, 2008, which describes the in vitro fibrillogenesis screen. Trade press reporting of the same company work described a 0.01 percent formula applied for two months that made collagen fibers more uniform in a handful of volunteers, and a placebo comparison (22 women on peptide, 21 on placebo) reporting a 54 percent rise in suppleness. Those numbers come from the manufacturer and are not easy to check against full published data. The one independent-looking human trial is Raikou and colleagues, Journal of Cosmetic Dermatology 2017: 24 volunteers split into four groups (combination with acetyl hexapeptide-3, each peptide alone, or neither) for 60 days, with some statistically significant differences in wrinkle microtopography and water loss. Six people per group is very small, and the authors themselves could not explain any synergy. Fair summary: a clever design with real in vitro logic, and thin human data. |
Frequently Asked Questions: Palmitoyl Tripeptide-38 vs Tripeptide-10 Citrulline
What is the difference between Palmitoyl Tripeptide-38 and Tripeptide-10 Citrulline?
Palmitoyl Tripeptide-38 is a skin & hair peptide that palmitoyl tripeptide-38 is the active in sederma's matrixyl synthe'6, a newer member of the matrixyl family launched around 2011. it is a three-amino-acid fragment with a fatty acid tail, sold as a wrinkle 'filler from the inside' for forehead lines and crow's feet. it is a cosmetic ingredient, not a drug, and the honest picture is simple: the efficacy claims come almost entirely from the company that makes it. Tripeptide-10 Citrulline is a skin & hair peptide that tripeptide-10 citrulline, sold as decorinyl, is a small synthetic peptide (four residues, despite the name) designed by the spanish ingredient maker lipotec to mimic decorin, a protein that keeps collagen fibers neat and evenly sized. the pitch is better collagen, not more collagen. it is a cosmetic ingredient, not an fda-approved drug, and almost all of the evidence comes from the company that makes it. The main differences lie in their mechanisms of action and clinical applications.
Which is better, Palmitoyl Tripeptide-38 or Tripeptide-10 Citrulline?
Neither is universally "better" - the choice depends on your specific goals. Palmitoyl Tripeptide-38 is typically used for skin & hair purposes, while Tripeptide-10 Citrulline is used for skin & hair. Always consult with a healthcare provider to determine which may be appropriate for your situation.
Can Palmitoyl Tripeptide-38 and Tripeptide-10 Citrulline be used together?
Some peptide protocols combine multiple compounds for synergistic effects. However, using Palmitoyl Tripeptide-38 and Tripeptide-10 Citrulline together should only be considered under medical supervision, as both compounds have their own side effect profiles and potential interactions. Research on their combined use may be limited.