Ingredient review
Potassium Myristyl Aspartate
INCI: Potassium Myristyl Aspartate
A mild, amino-acid-based surfactant that effectively cleanses while being gentle on the skin barrier.
In plain English
Potassium Myristyl Aspartate is a cleansing ingredient made from aspartic acid (an amino acid) and myristyl alcohol (a fatty alcohol). It works like a gentle soap that lifts dirt, oil, and makeup from your skin without stripping away its natural protective oils. Because it's derived from amino acids, it tends to be much milder than traditional sulfate cleansers, making it a popular choice for sensitive or dry skin types.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Potassium Myristyl Aspartate 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 Potassium Myristyl Aspartate.
- 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 semi-synthetic surfactant created by combining aspartic acid (an amino acid) with myristyl alcohol (a fatty alcohol derived from coconut or palm oil). It is often used as a primary or secondary cleansing agent in sulfate-free formulations.
How it works
It reduces the surface tension between water and oil, allowing water to mix with and rinse away sebum, dirt, and impurities. Its molecular structure is larger and less penetrating than harsher surfactants, so it cleans effectively without disrupting the skin's moisture barrier.
Pros
Mild on skin
Its amino-acid base makes it much less irritating than traditional sulfate cleansers, so it's ideal for daily use on sensitive or reactive skin.
Supports barrier health
Because it doesn't strip the skin's natural oils, it helps maintain a healthy moisture barrier, reducing the risk of dryness and irritation.
Cons and cautions
Lower lather
It produces a creamier, less bubbly lather than sulfates, which some people may not enjoy if they prefer a foamy cleanse.
Less effective on heavy makeup
It may struggle to remove long-wear or waterproof makeup on its own, often requiring a double-cleansing step.
Best for
- People with dry or sensitive skin looking for a gentle cleanser
- Anyone wanting to avoid harsh sulfates like SLS or SLES
Use caution if
- Those who prefer a very foamy, high-lather cleanser may find it less satisfying
Usage tips
Safety summary
Potassium Myristyl Aspartate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin.
Research notes
Amino-acid-based surfactants like Potassium Myristyl Aspartate are well-documented in cosmetic science as milder alternatives to sulfates. While specific studies on this exact compound are limited, the broader class is supported by dermatological consensus on gentleness and skin compatibility.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- Derived from renewable plant sources (coconut or palm oil), but sourcing practices can vary. Look for sustainably sourced palm derivatives if that is a concern.
Good to know
- This ingredient is often found in 'amino acid' or 'sulfate-free' cleansers.
- It is generally considered biodegradable and more environmentally friendly than some traditional surfactants.
Common questions
What is Potassium Myristyl Aspartate in beauty products?
Potassium Myristyl Aspartate is a cleansing ingredient made from aspartic acid (an amino acid) and myristyl alcohol (a fatty alcohol). It works like a gentle soap that lifts dirt, oil, and makeup from your skin without stripping away its natural protective oils. Because it's derived from amino acids, it tends to be much milder than traditional sulfate cleansers, making it a popular choice for sensitive or dry skin types.
What does Potassium Myristyl Aspartate do in a beauty product?
It reduces the surface tension between water and oil, allowing water to mix with and rinse away sebum, dirt, and impurities. Its molecular structure is larger and less penetrating than harsher surfactants, so it cleans effectively without disrupting the skin's moisture barrier.
Is Potassium Myristyl Aspartate safe for most people?
Potassium Myristyl Aspartate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin.
Who should be careful with Potassium Myristyl Aspartate?
Those who prefer a very foamy, high-lather cleanser may find it less satisfying
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.