Ingredient review
Potassium Stearoyl Hydrolyzed Collagen
INCI: POTASSIUM STEAROYL HYDROLYZED COLLAGEN
A mild, collagen-derived surfactant that cleanses without stripping the skin’s natural moisture barrier.
In plain English
Potassium Stearoyl Hydrolyzed Collagen is a gentle cleansing ingredient made by combining stearic acid (a fatty acid from plant or animal sources) with hydrolyzed collagen (broken-down collagen protein). It acts as a surfactant, meaning it helps water mix with oil and dirt so they can be rinsed away. Unlike harsh soaps, it cleans without leaving skin feeling tight or dry, and it can also leave a light conditioning effect.
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 Stearoyl Hydrolyzed Collagen 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 Stearoyl Hydrolyzed Collagen.
- 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 reacting stearic acid with hydrolyzed collagen. The collagen provides mildness and conditioning, while the stearic acid gives it cleansing ability.
How it works
It lowers the surface tension between water and oil, allowing dirt and sebum to be emulsified and rinsed away. The collagen portion helps the ingredient bind to the skin, leaving a thin protective film that reduces moisture loss.
Pros
Mild on skin
Unlike harsh detergents, this surfactant cleans without disrupting the skin barrier, making it ideal for daily use on sensitive or dry skin.
Conditioning effect
The collagen component leaves a light film that helps skin feel soft and hydrated after washing, reducing the need for extra moisturizer.
Cons and cautions
Low foam
It produces less lather than traditional sulfate cleansers, which may feel less satisfying to users who associate foam with cleanliness.
Animal-derived potential
Collagen is often sourced from animals, so this ingredient may not align with vegan or vegetarian preferences unless a plant-based alternative is specified.
Best for
- People with dry or sensitive skin looking for a mild cleanser
- Anyone wanting a sulfate-free cleansing option
Use caution if
- Strict vegans or vegetarians who prefer plant-only ingredients (check source)
Usage tips
Safety summary
Potassium Stearoyl Hydrolyzed Collagen is considered safe for use in cosmetics. It has low irritation and comedogenic potential, making it suitable for sensitive skin. As with any ingredient, patch test if you have known allergies to collagen or stearic acid.
Research notes
While direct studies on this specific ingredient are limited, its components (hydrolyzed collagen and stearic acid) are well-studied and recognized as safe by cosmetic safety panels. Collagen derivatives are known for their mildness and skin-conditioning properties.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on products
- Regulatory status
- Approved for use in cosmetics in the US, EU, and most major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Facial cleansers, Body washes, Shampoos, Conditioners
- Environmental note
- Derived from renewable sources (stearic acid from plant oils, collagen from animal by-products). Biodegradable and generally considered low environmental impact.
Good to know
- This ingredient is often listed near the top of ingredient lists in mild cleansers.
- It is considered biodegradable and more environmentally friendly than some synthetic surfactants.
Common questions
What is Potassium Stearoyl Hydrolyzed Collagen in beauty products?
Potassium Stearoyl Hydrolyzed Collagen is a gentle cleansing ingredient made by combining stearic acid (a fatty acid from plant or animal sources) with hydrolyzed collagen (broken-down collagen protein). It acts as a surfactant, meaning it helps water mix with oil and dirt so they can be rinsed away. Unlike harsh soaps, it cleans without leaving skin feeling tight or dry, and it can also leave a light conditioning effect.
What does Potassium Stearoyl Hydrolyzed Collagen do in a beauty product?
It lowers the surface tension between water and oil, allowing dirt and sebum to be emulsified and rinsed away. The collagen portion helps the ingredient bind to the skin, leaving a thin protective film that reduces moisture loss.
Is Potassium Stearoyl Hydrolyzed Collagen safe for most people?
Potassium Stearoyl Hydrolyzed Collagen is considered safe for use in cosmetics. It has low irritation and comedogenic potential, making it suitable for sensitive skin. As with any ingredient, patch test if you have known allergies to collagen or stearic acid.
Who should be careful with Potassium Stearoyl Hydrolyzed Collagen?
Strict vegans or vegetarians who prefer plant-only ingredients (check source)
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.