Ingredient review
Potassium Sulfopropylacrylate
INCI: POTASSIUM SULFOPROPYLACRYLATE
A safe, synthetic thickener that helps create lightweight, non-greasy gel textures in skincare.
In plain English
Potassium Sulfopropylacrylate is a synthetic ingredient that acts like a sponge to absorb water and swell, turning a liquid into a smooth, spreadable gel. It's what gives many serums and creams their silky, lightweight feel without leaving a sticky or greasy residue. Think of it as the ingredient that makes your moisturizer easy to apply and pleasant on your 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.
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
Potassium Sulfopropylacrylate 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 Sulfopropylacrylate.
- 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 high-molecular-weight synthetic polymer derived from acrylic acid. It is a white powder that, when mixed with water, forms a clear or slightly hazy gel. It is commonly used as a thickener and stabilizer in cosmetic formulations.
How it works
When added to water, the polymer chains unwind and absorb water molecules, causing the solution to thicken into a gel. This creates a stable network that can suspend other ingredients (like oils or active particles) and prevent them from separating. It also helps emulsions (mixtures of oil and water) stay mixed and feel smooth on the skin.
Pros
Lightweight texture
Creates a silky, non-greasy feel that absorbs quickly, making it ideal for oily or acne-prone skin.
Excellent stabilizer
Helps keep water and oil mixed in creams and lotions, so the product stays consistent and effective throughout its shelf life.
Cons and cautions
Synthetic origin
Derived from petroleum-based acrylic acid, which may be a concern for those seeking fully natural or 'clean' formulations.
Potential tackiness
If used at too high a concentration, it can leave a slightly sticky or tacky feel on the skin, though this is rare in well-formulated products.
Best for
- Anyone who prefers lightweight, gel-based moisturizers or serums
- People with oily or combination skin who want a matte finish
Use caution if
- Those strictly avoiding all synthetic ingredients
Usage tips
Safety summary
Potassium Sulfopropylacrylate 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
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that polyacrylate-based thickeners are safe for use in cosmetics. Studies show minimal skin penetration and low potential for 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. No known restrictions on concentration in leave-on or rinse-off products.
- Common uses
- Gels, Serums, Creams, Lotions, Sunscreens
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in very small amounts and is not considered a major environmental concern compared to microplastics.
Good to know
- This ingredient is often combined with other thickeners like Carbomer to fine-tune texture.
- It is considered very safe and is widely used in both drugstore and luxury skincare.
Common questions
What is Potassium Sulfopropylacrylate in beauty products?
Potassium Sulfopropylacrylate is a synthetic ingredient that acts like a sponge to absorb water and swell, turning a liquid into a smooth, spreadable gel. It's what gives many serums and creams their silky, lightweight feel without leaving a sticky or greasy residue. Think of it as the ingredient that makes your moisturizer easy to apply and pleasant on your skin.
What does Potassium Sulfopropylacrylate do in a beauty product?
When added to water, the polymer chains unwind and absorb water molecules, causing the solution to thicken into a gel. This creates a stable network that can suspend other ingredients (like oils or active particles) and prevent them from separating. It also helps emulsions (mixtures of oil and water) stay mixed and feel smooth on the skin.
Is Potassium Sulfopropylacrylate safe for most people?
Potassium Sulfopropylacrylate 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 Sulfopropylacrylate?
Those strictly avoiding all synthetic ingredients
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.