Ingredient review
Myristoyl Tetrapeptide-20
INCI: Myristoyl Tetrapeptide-20
A lab-made peptide that signals skin to appear firmer and smoother, with low irritation potential.
In plain English
Myristoyl Tetrapeptide-20 is a small protein fragment (peptide) attached to a fatty acid (myristic acid) to help it absorb into skin. It works like a messenger, telling skin cells to produce more collagen and elastin, which are the building blocks that keep skin plump and springy. Over time, this can help soften the look of fine lines and improve skin firmness. Because it's made in a lab, it's very pure and unlikely to cause reactions.
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-20 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-20.
- 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
A synthetic peptide—a short chain of amino acids—chemically bonded to myristic acid (a fatty acid) to enhance its ability to penetrate the skin's outer layer.
How it works
Once applied, the peptide portion mimics natural signaling molecules in the skin. It binds to receptors on fibroblasts (the cells that make collagen) and encourages them to ramp up collagen and elastin production. The myristoyl group helps the peptide slip through the skin barrier more easily, so it can reach the deeper layers where it can do its job.
Pros
Gentle collagen support
Unlike stronger actives like retinol, this peptide works subtly without causing peeling or redness, making it suitable for sensitive skin.
Good formulation stability
It stays effective in water-based serums and creams, and plays well with other common ingredients like hyaluronic acid and niacinamide.
Cons and cautions
Slow visible results
You'll need to use it consistently for at least 8–12 weeks before noticing any difference in firmness or wrinkle depth.
Low concentration in products
Because it's costly, many products contain only a tiny amount, which may limit its effectiveness unless the formula is well-designed.
Best for
- Anyone looking to gently support collagen production without irritation
- People with fine lines or early signs of aging who want a preventive or maintenance ingredient
Use caution if
- Those seeking immediate, dramatic results (peptides work slowly)
Usage tips
Safety summary
Myristoyl Tetrapeptide-20 is considered safe for cosmetic use. It has a low irritation and comedogenic profile, and no significant safety concerns have been reported in the available literature.
Research notes
While specific studies on Myristoyl Tetrapeptide-20 are limited, the broader class of palmitoylated peptides has been shown in clinical trials to modestly improve skin firmness and reduce wrinkle depth over 8–12 weeks. More independent research is needed to confirm its efficacy alone.
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. No known restrictions at typical use levels.
- Common uses
- Anti-aging serums, Firming creams, Eye treatments
- Environmental note
- Synthetic peptides are produced via chemical synthesis, which has a lower environmental footprint than harvesting from animal or plant sources.
Good to know
- Peptides like this one are often listed near the end of an ingredient list because they're used at low concentrations.
- Myristoyl Tetrapeptide-20 is sometimes combined with other peptides in a single product for a broader anti-aging effect.
Common questions
What is Myristoyl Tetrapeptide-20 in beauty products?
Myristoyl Tetrapeptide-20 is a small protein fragment (peptide) attached to a fatty acid (myristic acid) to help it absorb into skin. It works like a messenger, telling skin cells to produce more collagen and elastin, which are the building blocks that keep skin plump and springy. Over time, this can help soften the look of fine lines and improve skin firmness. Because it's made in a lab, it's very pure and unlikely to cause reactions.
What does Myristoyl Tetrapeptide-20 do in a beauty product?
Once applied, the peptide portion mimics natural signaling molecules in the skin. It binds to receptors on fibroblasts (the cells that make collagen) and encourages them to ramp up collagen and elastin production. The myristoyl group helps the peptide slip through the skin barrier more easily, so it can reach the deeper layers where it can do its job.
Is Myristoyl Tetrapeptide-20 safe for most people?
Myristoyl Tetrapeptide-20 is considered safe for cosmetic use. It has a low irritation and comedogenic profile, and no significant safety concerns have been reported in the available literature.
Who should be careful with Myristoyl Tetrapeptide-20?
Those seeking immediate, dramatic results (peptides work slowly)
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.