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preclinicalSkin & Cosmetic

Acetyl Tetrapeptide-5

Also known as: Eyeseryl, Anti-Edema Peptide, Lipotec Eyeseryl, Ac-beta-Ala-His-Ser-His-NH2

Acetyl Tetrapeptide-5 (marketed as Eyeseryl) is a synthetic tetrapeptide specifically designed to target periorbital puffiness, under-eye bags, and dark circles. It reduces edema by decreasing vascular permeability and inhibiting glycation of the delicate capillary networks around the eyes. By strengthening the microvascular integrity of the periorbital area, it prevents fluid accumulation in the tissue that creates the appearance of puffy, swollen eyes.

3 cited references·5 researched benefits

Quick Answer

Acetyl Tetrapeptide-5 (Eyeseryl) is a synthetic peptide that targets under-eye puffiness, bags, and dark circles by reducing vascular permeability and fluid accumulation in periorbital tissue. It inhibits glycation damage to capillary walls, preserving microvascular integrity. Clinical studies show up to 70% reduction in under-eye puffiness after 60 days of twice-daily application. It also reduces dark circles by improving capillary health and reducing fluid-mediated discoloration.

Key Facts

Mechanism
Acetyl Tetrapeptide-5 works through two primary mechanisms to reduce periorbital edema. First, it decreases vascular permeability by reinforcing endothelial tight junctions in periorbital capillaries. When capillary walls become leaky (due to glycation damage, inflammation, or aging), fluid and plasma proteins seep into surrounding tissue, causing edema and puffiness. By maintaining endothelial barrier integrity, the peptide prevents this fluid extravasation. Second, it inhibits non-enzymatic glycation of vascular and dermal proteins. The periorbital skin is the thinnest on the body (~0.5 mm) with an extremely delicate capillary network. Glycation damage to these capillaries is a major contributor to chronic under-eye bags and dark circles. By protecting capillary structural proteins from glycation, the peptide preserves long-term vascular health in this sensitive area.
Research Status
preclinical
Half-Life
N/A (topical cosmeceutical — not systemically absorbed)
Molecular Formula
C₂₀H₃₂N₈O₈
Primary Use
Skin & Cosmetic
Table of Contents

Benefits

  • Reduces under-eye puffiness — manufacturer studies show up to 70% reduction in periorbital edema after 60 dayspreliminary
  • Decreases vascular permeability in periorbital capillaries, preventing fluid accumulationpreliminary
  • Inhibits glycation damage to delicate capillary walls around the eyespreliminary
  • Reduces the appearance of dark circles by improving microvascular integritypreliminary
  • Specifically designed for the thin, delicate periorbital skin — appropriate for this sensitive areamoderate

Dosage Protocols

RouteDosage RangeFrequencyNotes
Topical eye cream or serum0.5–2% Eyeseryl solution2x daily (morning and evening)Apply gently around the orbital bone using the ring finger (lightest touch). Pat product into the under-eye area rather than rubbing. Avoid applying too close to the lash line to prevent product from entering the eye. Results typically noticeable after 15–30 days, with optimal results at 60 days.
Topical eye patches or masks1–2% Eyeseryl solution2–3x weeklyUnder-eye hydrogel patches infused with Eyeseryl provide concentrated delivery. Leave on for 15–20 minutes. Can be used as a pre-event treatment for acute puffiness or as a regular treatment for chronic under-eye bags.

Medical disclaimer

Dosage information is provided for educational reference only. Always follow your prescriber's instructions and consult a qualified healthcare provider before starting any peptide protocol.

Side Effects

  • Mild eye area irritation in rare cases — formulated for periorbital use with minimal irritation riskrare
  • Slight transient stinging if product enters the eye directlyrare
  • No systemic side effects or serious adverse events reported at cosmetic concentrationsrare

Frequently Asked Questions

What causes under-eye bags and puffiness?
Under-eye puffiness results from fluid accumulation (edema) in the periorbital tissue, which is exacerbated by thin skin, leaky capillaries, poor lymphatic drainage, aging, allergies, and salt intake. The periorbital skin is the thinnest on the body with a dense capillary network. When these capillaries become damaged or leaky — from glycation, UV damage, or inflammation — plasma fluid seeps into the surrounding tissue. Gravity and sleep position can worsen the appearance. Acetyl Tetrapeptide-5 targets the capillary leakiness at its source.
How does Acetyl Tetrapeptide-5 compare to caffeine for under-eye puffiness?
Caffeine and Acetyl Tetrapeptide-5 work through different mechanisms. Caffeine is a vasoconstrictor that temporarily reduces blood vessel diameter, decreasing fluid flow to the area and providing an acute de-puffing effect. Acetyl Tetrapeptide-5 works on a structural level by reducing capillary permeability and preventing glycation damage. Caffeine provides faster but temporary results; Acetyl Tetrapeptide-5 provides slower but more lasting structural improvement. Many effective eye creams combine both ingredients.
Can Acetyl Tetrapeptide-5 help with dark circles?
Dark circles have multiple causes — thin skin revealing underlying blood vessels, hyperpigmentation, and vascular congestion. Acetyl Tetrapeptide-5 primarily helps with the vascular component by improving capillary integrity and reducing fluid accumulation that can darken the under-eye area through hemoglobin breakdown products. For pigmentation-related dark circles, additional ingredients like vitamin C, vitamin K, or niacinamide may be needed.

References

  1. 1
    Eyeseryl (Acetyl Tetrapeptide-5): evaluation of an anti-edema peptide for periorbital application(2011)
  2. 2
    Peptide-based approaches to periorbital aging: targeting puffiness, dark circles, and fine lines(2016)
  3. 3
    Cosmeceutical peptides in the framework of sustainable wellness economy(2021)

Latest Research

Last updated: 2026-02-19