Acetyl tetrapeptide-5Cosmetic ingredient
Acetyl tetrapeptide-5 is a cosmetic peptide commonly associated with the Eyeseryl name. It is marketed for the appearance of puffiness around the eyes.
What is Acetyl tetrapeptide-5?
Acetyl tetrapeptide-5 is a cosmetic ingredient commonly associated with the supplier name Eyeseryl. It is used in products intended to reduce the appearance of puffiness around the eyes.
How it works
Supplier explanations propose effects on processes related to fluid movement and proteins in the skin. These are proposed mechanisms, not an established explanation for every type of under-eye bag.
Effects studied
Under-eye puffiness
The retained lead is supplier material. It provides a research rationale, but should not be presented as independent confirmation of a clinically meaningful benefit for all causes of puffiness. 1
Evidence: Supplier evidence; independent controlled confirmation is not established in this record.
What does the evidence show?
The retained leads are primarily supplier and ingredient references. They establish the marketing and ingredient context, rather than independent proof of a dependable clinical benefit.
The idea behind the ingredient
Supplier explanations connect this peptide with processes involving fluid movement and changes to structural proteins. Those are hypotheses about how an appearance effect might happen. They are not measurements of how much puffiness an ordinary user will lose, or evidence that the peptide treats a medical cause of swelling. 1
Not every “eye bag” is the same
Temporary morning puffiness, prominent fat pads, loose skin and dark pigmentation can all be described as tired-looking eyes. A product studied for one of these cannot be assumed to address the others. A broad promise to make the whole eye area look younger leaves those differences unexplained.
What would strengthen the claim
An independent controlled trial of the actual formula could show whether a visible change exceeds the effects of moisturising or cooling alone. It would need to explain who took part, what counted as improvement and whether any change lasted. Supplier photographs without those details leave important questions unanswered.
Sensitivity and swelling around the eyes
The skin around the eyes can react to fragrances, preservatives and other ingredients in a formula. A cosmetic also does not explain sudden, painful or persistent swelling. In that situation, identifying the cause matters more than finding a stronger peptide eye cream.
Safety & status
The eye area can be sensitive to a finished formula. Sudden, painful or persistent swelling should not automatically be treated as a cosmetic puffiness problem.
Country and product status
This page describes a cosmetic ingredient and its research context. Permitted claims and product availability in Germany and Switzerland need a local check. An ingredient listing does not establish approval to treat a medical condition.
Frequently asked questions
Can it remove every kind of under-eye bag?
No such effect is established. Fluid-related puffiness, prominent fat pads and loose skin are different problems.
Is it intended to lighten dark circles?
Puffiness and pigmentation are separate outcomes. Evidence for one does not establish a result for the other.
Sources
This entry was rewritten from our research archive. References below are reading leads unless a completed check is explicitly noted; a full independent evidence and regulatory review is still pending.
- Acetyl tetrapeptide-5: www.lubrizol.com reference Reference or product information · Retained archive reference; not independently checked for this draft.
- Acetyl tetrapeptide-5: incidecoder.com reference Reference or product information · Retained archive reference; not independently checked for this draft.
- Acetyl tetrapeptide-5: www.fda.gov reference Reference or product information · Retained archive reference; not independently checked for this draft.
- Acetyl tetrapeptide-5: www.fda.gov reference Reference or product information · Retained archive reference; not independently checked for this draft.
Research provenance
This name was discovered in the Superpower peptide index, archived 26 October 2026. Its ratings and reviewer attribution have not been adopted as our own. The archive informed this original editorial draft; independent source review is still pending.