Ingredient review
Polysorbate 40
INCI: Polysorbate 40
Polysorbate 40 is a gentle emulsifier that keeps oil and water mixed in your products, but it may be too rich for very oily or acne-prone skin.
In plain English
Polysorbate 40 is a helper ingredient that allows oil and water to stay blended together in creams, lotions, and cleansers. Without it, your moisturizer would separate into a watery layer and an oily layer. It is made from sorbitol (a sugar alcohol) and palmitic acid (a fatty acid from palm oil), then processed to become water-soluble. In skincare, it is considered very mild and is used in many rinse-off and leave-on products.
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
Polysorbate 40 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 Polysorbate 40.
- 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
Polysorbate 40 is a semi-synthetic emulsifier derived from sorbitol and palmitic acid. It belongs to the polysorbate family, which are widely used in cosmetics and food as safe, non-ionic surfactants.
How it works
Polysorbate 40 has both water-loving and oil-loving parts, so it positions itself at the boundary between oil and water droplets. This stabilizes the mixture, preventing separation and giving your product a smooth, uniform texture. It also helps dissolve oils into water, making it useful in cleansers and makeup removers.
Pros
Gentle on skin
Polysorbate 40 has a very low irritation risk, making it suitable for sensitive skin and daily use in leave-on products.
Effective stabilizer
It prevents oil and water from separating, ensuring your product stays consistent and effective from first use to last.
Cons and cautions
Potential for greasiness
Because it is derived from palmitic acid, it can leave a slightly heavier feel on very oily skin compared to lighter emulsifiers.
Sustainability concerns
Polysorbate 40 is often sourced from palm oil, which can be associated with deforestation unless certified sustainable.
Best for
- Anyone using lotions, creams, or serums that need a stable texture
- People with normal to dry skin who want a gentle emulsifier
Use caution if
- Those with extremely oily or acne-prone skin may prefer lighter emulsifiers like Polysorbate 20
Usage tips
Safety summary
Polysorbate 40 is considered safe for cosmetic use at typical concentrations. It has low irritation and sensitization potential, and is not known to be carcinogenic or toxic. However, as with any ingredient, patch test if you have very sensitive skin.
Research notes
Multiple safety reviews by the Cosmetic Ingredient Review (CIR) panel have concluded that polysorbates are safe for use in cosmetics. Studies show very low acute toxicity and no significant skin irritation or sensitization.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. Generally recognized as safe in the US for food use.
- Common uses
- Cleansers, Moisturizers, Serums, Makeup removers
- Environmental note
- Derived from palm oil; look for RSPO-certified sustainable sources to reduce environmental impact.
Good to know
- Polysorbate 40 is also used in some foods and medicines as an emulsifier.
- It is considered non-comedogenic for most people, but everyone's skin is different.
Common questions
What is Polysorbate 40 in beauty products?
Polysorbate 40 is a helper ingredient that allows oil and water to stay blended together in creams, lotions, and cleansers. Without it, your moisturizer would separate into a watery layer and an oily layer. It is made from sorbitol (a sugar alcohol) and palmitic acid (a fatty acid from palm oil), then processed to become water-soluble. In skincare, it is considered very mild and is used in many rinse-off and leave-on products.
What does Polysorbate 40 do in a beauty product?
Polysorbate 40 has both water-loving and oil-loving parts, so it positions itself at the boundary between oil and water droplets. This stabilizes the mixture, preventing separation and giving your product a smooth, uniform texture. It also helps dissolve oils into water, making it useful in cleansers and makeup removers.
Is Polysorbate 40 safe for most people?
Polysorbate 40 is considered safe for cosmetic use at typical concentrations. It has low irritation and sensitization potential, and is not known to be carcinogenic or toxic. However, as with any ingredient, patch test if you have very sensitive skin.
Who should be careful with Polysorbate 40?
Those with extremely oily or acne-prone skin may prefer lighter emulsifiers like Polysorbate 20
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.