- Evidence
- DNo meaningful data
- FDA status
- Cosmetic ingredientas of 2026-10-26
- Route
- Topical
- Studies cited
- 0 human0 animal or cell
It is put in eye creams to reduce puffy bags under the eyes. No independent study has been published; the only tests come from the company that makes it.
Sold for
Eyeseryl is sold as an eye-cream peptide that reduces under-eye bags and puffiness by draining fluid and blocking glycation.
Studies say
There is no published, peer-reviewed evidence for any effect; the supporting data are the manufacturer's own tests (grade D).
Why grade D. The claims for reducing under-eye puffiness come from the manufacturer's product documentation and ingredient databases that repeat it. No peer-reviewed human trial, animal study or cell study of acetyl tetrapeptide-5 could be found, so the largest human sample is zero. 12
FDA. Acetyl tetrapeptide-5 (Eyeseryl) is a cosmetic ingredient. The FDA does not approve cosmetic ingredients before sale and regulates eye creams containing it as cosmetics as long as they claim only to improve appearance; it is not an approved drug for any use. 34
Written from 4 cited sources. Fact-checked 2026-10-27: 9 claims checked, 2 corrected. Last refreshed 2026-10-27. Not physician reviewed.
What this means for you
- What people take it for
- Puffy bags under the eyes
- Can a US doctor prescribe it?
- No prescription; it is a cosmetic ingredient.
- Properly tested in people?
- No meaningful testing published; the maker reports a 20-person test that was never published in a journal.
Evidence checklist
- Randomised controlled trial No published trial; maker study unpublishedno
- Human study over 100 people No published human sampleno
- More than one research group Only manufacturer datano
- Clinical outcomes, not surrogate markers Appearance claims only, unpublishedno
- Human safety data beyond case reports No peer-reviewed safety datano
Drawn from the cited studies below. A dash means the sources give no information.
What it is
Acetyl tetrapeptide-5 is a lab-made peptide with four amino acids. Lubrizol (originally Lipotec) sells it as Eyeseryl. It is made for the eye area, where fluid buildup and loss of skin stretch cause bags and puffiness. 12
Many brands put it in eye creams and serums. It is a cosmetic ingredient, so the maker did not have to show the FDA that it works before selling it. The FDA has not reviewed its claims. 34
How it works
The maker describes two ways it may work. First, it may block angiotensin-converting enzyme (ACE). Some blood pressure drugs target the same enzyme. In skin, this is thought to help fluid drain and ease swelling. Second, it may stop glycation. Glycation is when sugars stick to proteins such as collagen and make them stiff. The peptide is said to interfere with that. Both ideas come from the maker's own tests. No independent, peer-reviewed study has checked them. 12
What human research shows
The maker reports smaller eye bags and fewer dark circles after 14 days of use. INCIDecoder sums up the study behind this. Twenty volunteers used a product with a very small amount of the pure peptide. By day 15, 70% had improved. By day 60, 95% had improved, mostly slightly or moderately. The study appears in product literature. No journal has published it. So we cannot judge its design, controls or measures. No independent human study exists. 12
| Study | Model | Finding |
|---|---|---|
| Lubrizol Eyeseryl product data | Manufacturer volunteer study, about 20 people, 60 days, unpublished | Reported fewer eyebags from day 14 to 15 and improvement in most volunteers by day 60; design and controls not available for review. 1 |
| INCIDecoder ingredient entry | Ingredient database summary | Repeats the manufacturer's anti-oedema and anti-glycation claims and summarises its 20-volunteer study; cites no independent study. 2 |
Safety
No published safety data cover acetyl tetrapeptide-5 itself. Short peptides on the skin at low doses are usually well tolerated. Ingredient databases list no reactions. But no reports does not mean someone tested for safety. The Cosmetic Ingredient Review panel has not published a review of this ingredient. 23
Questions for your clinician
- Has any independent, published study tested this ingredient on under-eye puffiness?
- What causes my under-eye bags, and would a medical cause change what I should do?
- If I get a rash from an eye cream with this ingredient, what should I do?
Questions people ask
Is acetyl tetrapeptide-5 FDA-approved?
No. It is a cosmetic ingredient, and the FDA does not approve those. A product that claimed to treat a medical condition would count as a drug. Cosmetics may only claim to improve looks. 34
Does Eyeseryl reduce eye bags?
The only evidence is the maker's own volunteer study. No one has published or repeated it. No peer-reviewed trial shows an effect. 12
What does anti-glycation mean?
Glycation is when sugars bond to proteins without help from enzymes. Over time it stiffens collagen and elastin in skin. The maker says the peptide interferes with this, based on its own tests. No independent study has confirmed it. 2
Citations
- Lubrizol: Eyeseryl peptide solution product data lubrizol.com
- INCIDecoder: acetyl tetrapeptide-5 ingredient entry incidecoder.com
- FDA: how cosmetics are regulated but not approved fda.gov
- FDA: is it a cosmetic, a drug, or both? fda.gov