Ingredient review
Myristoyl Tetrapeptide-3
INCI: Myristoyl Tetrapeptide-3
A synthetic peptide that may help firm skin and reduce puffiness, especially around the eyes, with low irritation risk.
In plain English
Myristoyl Tetrapeptide-3 is a lab-made protein fragment (a peptide) that is often added to skincare products to help make skin feel firmer and look less puffy. It works by signaling skin cells to support the natural structures that keep skin tight and smooth. Because it's used in very tiny amounts, it's generally gentle and unlikely to cause irritation.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Myristoyl Tetrapeptide-3 is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Myristoyl Tetrapeptide-3.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Myristoyl Tetrapeptide-3 is a synthetic peptide, meaning it's a short chain of amino acids made in a lab. It's designed to mimic natural signaling molecules in the skin that help maintain firmness and reduce fluid buildup that can cause puffiness.
How it works
When applied to the skin, this peptide is thought to interact with skin cells to encourage the production of collagen and other supportive proteins. It may also help strengthen the walls of small blood vessels, which can reduce the leakage of fluid into surrounding tissues and thereby lessen puffiness.
Pros
Gentle on skin
Used at very low concentrations, it rarely causes irritation, making it suitable for sensitive areas like the eye contour.
Targets puffiness
Specifically studied for reducing under-eye bags by supporting capillary strength and reducing fluid retention.
Cons and cautions
Subtle effects
Results are typically gradual and mild; it is not a replacement for more intensive treatments like fillers or surgery.
Limited research
Most evidence comes from manufacturer studies; independent peer-reviewed research is sparse.
Best for
- People looking for a gentle anti-aging ingredient to support firmness
- Those concerned with under-eye puffiness or mild skin laxity
Use caution if
- Individuals with known peptide allergies (rare)
- Those seeking dramatic, immediate results
Usage tips
Safety summary
Myristoyl Tetrapeptide-3 is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. Allergic reactions are rare.
Research notes
Clinical studies (often manufacturer-sponsored) suggest improvements in skin firmness and reduction in under-eye puffiness. More independent research would strengthen the evidence base.
Common label clues
- Typical concentration
- 0.001% to 0.1%
- Regulatory status
- Approved as a cosmetic ingredient in the EU, US, and other major markets. Not classified as a drug.
- Common uses
- Eye creams, Serums, Moisturizers
- Environmental note
- Synthetic production reduces reliance on animal or plant sources, but the environmental impact of peptide synthesis is not well-documented.
Good to know
- Often found in eye creams alongside caffeine or hyaluronic acid for added de-puffing and hydration.
- The 'myristoyl' part is a fatty acid chain that helps the peptide penetrate the skin more easily.
Common questions
What is Myristoyl Tetrapeptide-3 in beauty products?
Myristoyl Tetrapeptide-3 is a lab-made protein fragment (a peptide) that is often added to skincare products to help make skin feel firmer and look less puffy. It works by signaling skin cells to support the natural structures that keep skin tight and smooth. Because it's used in very tiny amounts, it's generally gentle and unlikely to cause irritation.
What does Myristoyl Tetrapeptide-3 do in a beauty product?
When applied to the skin, this peptide is thought to interact with skin cells to encourage the production of collagen and other supportive proteins. It may also help strengthen the walls of small blood vessels, which can reduce the leakage of fluid into surrounding tissues and thereby lessen puffiness.
Is Myristoyl Tetrapeptide-3 safe for most people?
Myristoyl Tetrapeptide-3 is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. Allergic reactions are rare.
Who should be careful with Myristoyl Tetrapeptide-3?
Individuals with known peptide allergies (rare) Those seeking dramatic, immediate results
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.