Cosmetic peptide · eye-area products
Acetyl tetrapeptide-5 is a small synthetic peptide (acetyl-beta-alanyl-histidyl-seryl-histidine) used in eye creams and other skin-care products, sometimes under the trade name Eyeseryl. It is a cosmetic ingredient, not a medicine, and very little research on it has been published.
How acetyl tetrapeptide-5 might act in skin is not well established. Its trade names listed in PubChem, Eyeseryl and Depuffin, point to marketing for the eye area and puffiness1. In the only peer-reviewed study of it indexed in PubMed, researchers measured its activity against angiotensin-converting enzyme 1 (ACE-1), an enzyme of the blood-pressure-regulating renin-angiotensin system, and then studied it inside mixtures with other cosmetic peptides, so its own contribution is hard to separate2. Whether a peptide of this size, applied to the skin, reaches deeper layers in meaningful amounts has not been shown in published work.
Evidence is thin. A PubMed search for the name returns a single study. Wu and colleagues (2021) examined five cosmetic peptides, including acetyl tetrapeptide-5, first individually, then as six designed mixtures applied to cultured human skin fibroblasts stressed with hydrogen peroxide. One of the mixtures lowered markers of oxidative damage, raised collagen- and elastin-related measures, and increased antioxidant enzyme activity2. This was cell work, not a human study, and the published abstract does not isolate this peptide's own effect. No randomized human studies of acetyl tetrapeptide-5 for puffiness, dark circles or wrinkles appear in PubMed, and ClinicalTrials.gov lists no registered studies under its name.
Acetyl tetrapeptide-5 is not approved as a drug anywhere; it carries an INCI name, the naming system for cosmetic ingredients1. In the US, cosmetic ingredients do not need FDA approval before marketing, while a product that claims to treat disease or change body function is regulated as a drug3.
No published human studies report side effects for this ingredient, so its tolerability is essentially undocumented in the scientific literature. As with any topical product, skin irritation or allergic reactions are possible, particularly around the thin skin of the eyes.
This page is educational reference material about compounds studied in research settings. It is not medical advice, and nothing here is a recommendation to buy, possess, or use any compound. Research findings described are from published literature; individual compounds may not be approved for human use. Talk to a licensed clinician about anything that affects your health.
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