Acetyl tetrapeptide-5
Also known as: Eyeseryl
Acetyl tetrapeptide-5, marketed as Eyeseryl, is a topical cosmetic ingredient for the appearance of under-eye puffiness. Its evidence is primarily manufacturer-associated rather than independently replicated clinical research.
Quick Facts
A cosmetic tetrapeptide for the eye area
Acetyl tetrapeptide-5 is a synthetic four-amino-acid signal peptide developed as Eyeseryl by Lipotec, now part of Lubrizol. It appears mainly in eye creams, gels and serums intended to improve the look of puffiness and bags. Unlike an inert surface film, its proposed purpose is interaction with skin biology.
Supporting references: Eyeseryl.
Sources: [1]
Proposed anti-puffiness actions
Manufacturer and laboratory work proposes two actions. An anti-edema effect may reduce fluid accumulation by limiting leakage from small blood vessels. An anti-glycation effect may reduce sugar-related stiffening of collagen, helping delicate under-eye skin retain elasticity and limiting the slackened appearance of bags. These are proposed mechanisms from company-associated and laboratory testing, not established independent clinical outcomes. Uncertain penetration through the skin barrier limits what can be inferred about tissue effects.
Supporting references: glycation.
Sources: [2]
Cosmetic status and the drug boundary
Cosmetics and most cosmetic ingredients are not subject to FDA premarket approval in the way medicines are. They still must be safe when used as directed and accurately labeled. Calling a de-puffing or anti-aging serum ingredient FDA-approved would therefore be misleading. Appearance claims are cosmetic claims; claims to alter bodily structure or function may bring a product under drug regulation.
Supporting references: does not approve cosmetics; cosmetic and a drug.
Products and available evidence
The ingredient is used almost entirely in topical eye care to reduce the appearance of swelling, bags and puffiness, sometimes alongside caffeine or hyaluronic acid and sometimes with firmness or smoothness claims. Lipotec panel studies reported visible improvement in volunteers using peptide-containing formulations. Independent peer-reviewed clinical trials have not reproduced those findings in the available research. The mechanism is plausible and company results encouraging, but the evidentiary base remains thin.
Tolerability around the eyes
Cosmetic peptide formulations are generally described as having low irritation potential, but delicate periocular skin can still develop redness, stinging or an allergic reaction. Patch testing can identify individual intolerance. A product meant for the surrounding skin should be kept out of the eyes themselves.
References and further reading
This reference draws on Superpower’s Peptide Library and the research linked below. Peptide Dossier’s editorial team adapted and integrated the material on .
- lubrizol.comA cosmetic tetrapeptide for the eye areaCited in: A cosmetic tetrapeptide for the eye area
- incidecoder.comProposed anti-puffiness actionsCited in: Proposed anti-puffiness actions
- fda.govCosmetic status and the drug boundaryCited in: Cosmetic status and the drug boundary
- fda.govCosmetic status and the drug boundaryCited in: Cosmetic status and the drug boundary
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Disclaimer: This article is for informational and educational purposes only. It is not intended as medical advice. The information presented is based on published research and should not be used as a substitute for professional medical guidance. Always consult a qualified healthcare provider before starting any peptide protocol. Some peptides discussed may not be approved for human use by the FDA or equivalent regulatory bodies.