Ingredient review
Steartrimonium Hydroxyethyl Hydrolyzed Collagen
INCI: STEARTRIMONIUM HYDROXYETHYL HYDROLYZED COLLAGEN
A gentle conditioning ingredient that makes hair and skin feel softer without heavy buildup.
In plain English
This ingredient is a modified protein derived from collagen that has been treated to carry a positive charge. That positive charge helps it stick to the slightly negative surfaces of hair and skin, so it stays put and provides lasting softness and smoothness. It's often used in conditioners and moisturizers to reduce frizz, detangle, and improve texture without leaving a greasy feel.
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
Steartrimonium Hydroxyethyl 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 Steartrimonium Hydroxyethyl 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 quaternized (positively charged) derivative of hydrolyzed collagen, meaning collagen proteins are broken into smaller pieces and chemically modified to improve their ability to bind to hair and skin.
How it works
The positive charge on this ingredient attracts it to the negative charges on damaged hair and skin. It forms a thin, flexible film that smooths the cuticle or surface, reducing friction, static, and water loss. This film also helps other conditioning agents spread evenly.
Pros
Excellent detangling
The positive charge helps smooth the hair cuticle, making wet combing much easier and reducing breakage during styling.
Lightweight feel
Unlike some heavy oils or silicones, this ingredient provides softness without leaving hair greasy or limp, even with regular use.
Cons and cautions
Potential buildup
Because it binds strongly to hair, repeated use without clarifying shampoo can lead to a dull or heavy feeling, especially on fine hair.
Animal-derived origin
Collagen is typically sourced from animal hides or bones, so this ingredient is not suitable for vegans or those avoiding animal products.
Best for
- People with dry, damaged, or color-treated hair
- Those looking for a lightweight conditioner that doesn't weigh hair down
Use caution if
- Vegans or those avoiding animal-derived ingredients
- People with very fine hair who are prone to product buildup
Usage tips
Safety summary
Considered safe for use in rinse-off and leave-on products at typical concentrations. Rare reports of mild irritation in very sensitive individuals. Not known to be comedogenic.
Research notes
Studies on quaternized proteins show they improve hair strength, reduce breakage, and enhance smoothness. The collagen base provides amino acids that can help retain moisture. Most evidence is from cosmetic science literature and manufacturer data.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and most major markets. No specific concentration restrictions, but typical use levels are low.
- Common uses
- Conditioners, Hair masks, Leave-in treatments, Shampoos, Body washes, Facial cleansers
- Environmental note
- Collagen sourcing may involve animal agriculture; look for brands that specify sustainable or by-product sources if this is a concern.
Good to know
- This ingredient is often listed near the middle or end of ingredient lists, meaning it's used at low concentrations but still effective.
- It is compatible with both sulfate and sulfate-free cleansers.
Common questions
What is Steartrimonium Hydroxyethyl Hydrolyzed Collagen in beauty products?
This ingredient is a modified protein derived from collagen that has been treated to carry a positive charge. That positive charge helps it stick to the slightly negative surfaces of hair and skin, so it stays put and provides lasting softness and smoothness. It's often used in conditioners and moisturizers to reduce frizz, detangle, and improve texture without leaving a greasy feel.
What does Steartrimonium Hydroxyethyl Hydrolyzed Collagen do in a beauty product?
The positive charge on this ingredient attracts it to the negative charges on damaged hair and skin. It forms a thin, flexible film that smooths the cuticle or surface, reducing friction, static, and water loss. This film also helps other conditioning agents spread evenly.
Is Steartrimonium Hydroxyethyl Hydrolyzed Collagen safe for most people?
Considered safe for use in rinse-off and leave-on products at typical concentrations. Rare reports of mild irritation in very sensitive individuals. Not known to be comedogenic.
Who should be careful with Steartrimonium Hydroxyethyl Hydrolyzed Collagen?
Vegans or those avoiding animal-derived ingredients People with very fine hair who are prone to product buildup
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.