Ingredient review
Potassium Myristate
INCI: Potassium Myristate
Potassium Myristate is an effective cleanser that creates rich lather, but it can be drying or irritating for sensitive or dry skin types.
In plain English
Potassium Myristate is a salt formed from myristic acid (a fatty acid found in coconut oil and palm oil) and potassium hydroxide. In skincare, it acts as a surfactant, meaning it helps water mix with oil and dirt so they can be rinsed away. It's what gives many bar soaps and cleansers their foamy, bubbly lather. Because it's a soap-like ingredient, it can be quite effective at removing oil and makeup, but it may also strip the skin of its natural moisture barrier, leading to dryness or irritation, especially for those with sensitive or dry skin.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Potassium Myristate can be useful, but watch for some irritation potential.
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 Myristate.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
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
Potassium Myristate is a potassium salt of myristic acid, a fatty acid commonly derived from coconut or palm kernel oil. It is a synthetic ingredient produced through saponification, the same chemical process used to make traditional soap.
How it works
In a cosmetic product, Potassium Myristate works by reducing the surface tension between water and oil. This allows the product to lift dirt, sebum, and makeup from the skin's surface so they can be easily washed away with water. It also stabilizes foam, creating the rich lather many people associate with a thorough cleanse.
Pros
Powerful cleanser
Effectively removes excess oil, dirt, and makeup, leaving skin feeling thoroughly clean.
Satisfying lather
Creates a rich, foamy lather that many users associate with a deep, effective cleanse.
Cons and cautions
Can be drying
May strip the skin of natural oils, leading to tightness, flakiness, or irritation, especially for dry or sensitive skin types.
Higher pH
As a soap-based ingredient, it typically has a higher pH (around 9-10), which can disrupt the skin's natural acid mantle over time.
Best for
- People with oily or combination skin who enjoy a foamy cleanse
- Those looking for a simple, effective bar soap for body cleansing
Use caution if
- Individuals with dry, dehydrated, or sensitive skin
- Anyone with eczema, rosacea, or a compromised skin barrier
Usage tips
Safety summary
Potassium Myristate is considered safe for use in rinse-off cosmetics at typical concentrations. However, its high pH and strong cleansing action can cause dryness or irritation for some individuals, particularly those with sensitive or dry skin. It is not recommended for leave-on products.
Research notes
Research on Potassium Myristate primarily focuses on its surfactant properties and skin compatibility. Studies indicate that soap-based cleansers with high pH can increase skin dryness and irritation compared to milder syndet bars. There is no evidence of toxicity or carcinogenicity at cosmetic use levels.
Common label clues
- Typical concentration
- 1-10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. It is a common ingredient in rinse-off products and is generally recognized as safe when used as directed.
- Common uses
- Bar soaps, Facial cleansers, Body washes
- Environmental note
- Myristic acid is often sourced from palm or coconut oil. Palm oil production can be associated with deforestation, so look for sustainably sourced or RSPO-certified ingredients if this is a concern.
Good to know
- Potassium Myristate is often found in traditional bar soaps and some cream cleansers.
- It is different from milder synthetic surfactants like sodium cocoyl isethionate, which are less stripping.
Common questions
What is Potassium Myristate in beauty products?
Potassium Myristate is a salt formed from myristic acid (a fatty acid found in coconut oil and palm oil) and potassium hydroxide. In skincare, it acts as a surfactant, meaning it helps water mix with oil and dirt so they can be rinsed away. It's what gives many bar soaps and cleansers their foamy, bubbly lather. Because it's a soap-like ingredient, it can be quite effective at removing oil and makeup, but it may also strip the skin of its natural moisture barrier, leading to dryness or irritation, especially for those with sensitive or dry skin.
What does Potassium Myristate do in a beauty product?
In a cosmetic product, Potassium Myristate works by reducing the surface tension between water and oil. This allows the product to lift dirt, sebum, and makeup from the skin's surface so they can be easily washed away with water. It also stabilizes foam, creating the rich lather many people associate with a thorough cleanse.
Is Potassium Myristate safe for most people?
Potassium Myristate is considered safe for use in rinse-off cosmetics at typical concentrations. However, its high pH and strong cleansing action can cause dryness or irritation for some individuals, particularly those with sensitive or dry skin. It is not recommended for leave-on products.
Who should be careful with Potassium Myristate?
Individuals with dry, dehydrated, or sensitive skin Anyone with eczema, rosacea, or a compromised skin barrier
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.