Ingredient review
Myristoyl Tetrapeptide-46
INCI: MYRISTOYL TETRAPEPTIDE-46
A lab-made peptide that may help firm skin and soften expression lines, but human studies are limited.
In plain English
Myristoyl Tetrapeptide-46 is a small protein fragment (peptide) attached to a fatty acid (myristic acid) to help it absorb into skin. It is used in anti-aging products to encourage the skin to look firmer and smoother. Think of it as a signal molecule that tells skin cells to behave more youthfully, but it is not a quick fix and works best with consistent use over weeks.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Myristoyl Tetrapeptide-46 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-46.
- 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
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A synthetic peptide consisting of four amino acids linked to myristic acid, designed to mimic natural signaling molecules in the skin that support collagen and elastin production.
How it works
The myristic acid tail helps the peptide penetrate the outer skin layer. Once inside, the tetrapeptide portion is thought to bind to receptors on fibroblasts, potentially stimulating the production of collagen and other structural proteins, which can improve skin firmness and reduce the appearance of fine lines over time.
Pros
Targeted anti-aging signal
Myristoyl Tetrapeptide-46 is designed to mimic natural peptides that tell skin cells to produce more collagen and elastin, which can help improve firmness and reduce fine lines over time.
Low irritation potential
Because it is a synthetic peptide used at very low concentrations, it rarely causes stinging, redness, or breakouts, making it suitable for sensitive skin types.
Cons and cautions
Limited human evidence
Most supporting data comes from lab or animal studies; well-controlled human trials are scarce, so the real-world anti-aging effect may be modest for many users.
Slow and subtle results
Peptides like this one require consistent daily use for several weeks before visible changes appear, and the improvements are typically subtle rather than dramatic.
Best for
- Adults looking for anti-aging support
- Those with dry or mature skin wanting extra firmness
Use caution if
- Anyone with known peptide allergy (rare)
- Those seeking immediate results (peptides require weeks of use)
Usage tips
Safety summary
Myristoyl Tetrapeptide-46 is considered safe for topical use at typical cosmetic concentrations. Irritation and allergic reactions are rare. As with any new ingredient, a patch test is recommended for those with very sensitive skin.
Research notes
Evidence is primarily from in vitro studies and a few small human trials. The ingredient shows promise for supporting collagen synthesis, but more robust clinical research is needed to confirm its efficacy in diverse populations.
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
- Anti-aging serums, Firming creams, Eye treatments
- Environmental note
- Synthetic peptides are produced in controlled lab settings, which reduces environmental impact compared to animal-derived ingredients, but their biodegradability is not well documented.
Good to know
- Peptides are often listed near the end of ingredient lists because they are effective at very low concentrations.
- Combining this peptide with antioxidants like vitamin C may enhance overall anti-aging results.
Common questions
What is Myristoyl Tetrapeptide-46 in beauty products?
Myristoyl Tetrapeptide-46 is a small protein fragment (peptide) attached to a fatty acid (myristic acid) to help it absorb into skin. It is used in anti-aging products to encourage the skin to look firmer and smoother. Think of it as a signal molecule that tells skin cells to behave more youthfully, but it is not a quick fix and works best with consistent use over weeks.
What does Myristoyl Tetrapeptide-46 do in a beauty product?
The myristic acid tail helps the peptide penetrate the outer skin layer. Once inside, the tetrapeptide portion is thought to bind to receptors on fibroblasts, potentially stimulating the production of collagen and other structural proteins, which can improve skin firmness and reduce the appearance of fine lines over time.
Is Myristoyl Tetrapeptide-46 safe for most people?
Myristoyl Tetrapeptide-46 is considered safe for topical use at typical cosmetic concentrations. Irritation and allergic reactions are rare. As with any new ingredient, a patch test is recommended for those with very sensitive skin.
Who should be careful with Myristoyl Tetrapeptide-46?
Anyone with known peptide allergy (rare) Those seeking immediate results (peptides require weeks of use)
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.