Ingredient review
Myristoyl Tetrapeptide-4
INCI: Myristoyl Tetrapeptide-4
A gentle peptide that may help reduce visible redness and sensitivity over time, but results are subtle and not instant.
In plain English
Myristoyl tetrapeptide-4 is a lab-made peptide (a small chain of amino acids) designed to calm the skin. It works by signaling skin cells to reduce the release of compounds that cause redness and irritation. Think of it as a gentle messenger that tells your skin to chill out. It is often used in products for sensitive or reactive skin, but it is not a quick fix—it takes consistent use over weeks to see a difference.
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-4 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-4.
- 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-4 is a synthetic peptide composed of four amino acids (tetrapeptide) attached to a myristic acid chain. The myristic acid helps the peptide penetrate the skin's outer layer more effectively. It is designed to mimic natural signaling molecules that regulate inflammation and pigmentation.
How it works
In a cosmetic product, myristoyl tetrapeptide-4 interacts with skin cells to inhibit the release of pro-inflammatory cytokines (like IL-6 and TNF-alpha). By reducing these signals, it helps calm visible redness and may also interfere with the melanin production pathway, leading to a more even skin tone over time. It does not block UV rays or treat medical conditions.
Pros
Very gentle on skin
Myristoyl tetrapeptide-4 has a low irritation and comedogenic risk, making it suitable for sensitive and acne-prone skin types.
Targets both redness and tone
It works on two common concerns—calming visible reactivity and helping to fade uneven pigmentation—without harsh side effects.
Cons and cautions
Subtle, slow results
You won't see overnight changes. It takes consistent use over several weeks to notice any difference in redness or skin tone.
Limited standalone impact
For significant redness or hyperpigmentation, this peptide works best as part of a broader routine with other proven ingredients like niacinamide or sunscreen.
Best for
- People with sensitive or easily reddened skin
- Those looking for a gentle, non-irritating way to support an even complexion
Use caution if
- Anyone expecting dramatic or immediate results
Usage tips
Safety summary
Myristoyl tetrapeptide-4 is considered safe for cosmetic use at typical concentrations. It has a low irritation and comedogenic risk, and no significant safety concerns have been reported in the scientific literature. As with any ingredient, patch test if you have extremely reactive skin.
Research notes
Clinical and in vitro studies suggest that myristoyl tetrapeptide-4 can reduce markers of inflammation and melanin production. However, most evidence comes from ingredient suppliers and small-scale studies. Independent peer-reviewed research is limited, so the evidence level is moderate.
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. It is not a drug and cannot claim to treat or cure skin diseases.
- Common uses
- Serums, Moisturizers, Eye creams, Anti-redness treatments
- Environmental note
- As a synthetic peptide, it is produced in controlled laboratory conditions, which reduces environmental impact compared to some plant-derived ingredients. No known bioaccumulation concerns.
Good to know
- Myristoyl tetrapeptide-4 is often combined with other peptides (like palmitoyl tetrapeptide-7) in anti-aging and soothing formulas.
- It is stable in most pH ranges and does not require special storage.
Common questions
What is Myristoyl Tetrapeptide-4 in beauty products?
Myristoyl tetrapeptide-4 is a lab-made peptide (a small chain of amino acids) designed to calm the skin. It works by signaling skin cells to reduce the release of compounds that cause redness and irritation. Think of it as a gentle messenger that tells your skin to chill out. It is often used in products for sensitive or reactive skin, but it is not a quick fix—it takes consistent use over weeks to see a difference.
What does Myristoyl Tetrapeptide-4 do in a beauty product?
In a cosmetic product, myristoyl tetrapeptide-4 interacts with skin cells to inhibit the release of pro-inflammatory cytokines (like IL-6 and TNF-alpha). By reducing these signals, it helps calm visible redness and may also interfere with the melanin production pathway, leading to a more even skin tone over time. It does not block UV rays or treat medical conditions.
Is Myristoyl Tetrapeptide-4 safe for most people?
Myristoyl tetrapeptide-4 is considered safe for cosmetic use at typical concentrations. It has a low irritation and comedogenic risk, and no significant safety concerns have been reported in the scientific literature. As with any ingredient, patch test if you have extremely reactive skin.
Who should be careful with Myristoyl Tetrapeptide-4?
Anyone expecting dramatic or 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.