IgG-fragment peptide · skin aging
A cosmetic ingredient made by attaching palmitic acid to glycine-glutamine-proline-arginine (GQPR), a four-amino-acid fragment of immunoglobulin G (IgG), a type of antibody. It appears in skin care aimed at wrinkles and reactive skin, often paired with palmitoyl tripeptide-1 in the blend known as Matrixyl 3000.
Interleukin-6 (IL-6) is an inflammatory messenger made by skin cells. A 2021 review, citing an industry study, describes palmitoyl tetrapeptide-7 as lowering IL-6 release, reducing inflammation after UVB exposure, and increasing production of laminins and collagen VII, proteins of the junction that anchors the epidermis to the dermis1. The same review found no studies confirming benefit in skin inflammation or sensitive skin, and noted that much of the supporting data sit in patents and supplier brochures1. On delivery, an imaging study in three volunteers detected the peptide throughout the stratum corneum after a serum was applied, located between cells rather than inside them2. Whether it reaches the deeper living layers in useful amounts is not established.
Published human data come from blends, so this peptide's own contribution is hard to isolate. In a 12-week study, 37 women applied an eye cream combining palmitoyl tetrapeptide-7, palmitoyl tripeptide-1, a yeast/rice ferment, and N-acetylneuraminic acid to one side of the face; the treated side improved in hydration, elasticity, and ultrasound-measured collagen density compared with the untreated side, and the combined actives raised collagen and elastin output in cultured fibroblasts. There was no placebo cream3.
An earlier industry imaging study reported better dermal matrix structure versus placebo with a blend of palmitoyl oligopeptide and palmitoyl tetrapeptide-74. A 2021 review found no studies showing benefit for sensitive skin, despite patents describing that use1.
Not approved as a drug by the FDA or any other regulator found; it is used as a cosmetic ingredient1. In the US, cosmetic ingredients do not need FDA approval before they go on the market5.
We found no published human data on adverse effects of this peptide on its own. In the 12-week eye-cream study of a blend containing it, dermatologists observed no reactions such as redness, papules, scabbing, or peeling in 37 women3. As with any topical cosmetic, the finished product can irritate skin or cause contact allergy.
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