Ingredient review
Steardimonium Hydroxypropyl Hydrolyzed Collagen
INCI: Steardimonium Hydroxypropyl Hydrolyzed Collagen
A gentle conditioning ingredient that reduces static and softens hair, but offers limited skin benefits.
In plain English
This ingredient is a modified protein derived from collagen. It has been chemically altered to carry a positive charge, which helps it stick to the negatively charged surface of hair strands. This reduces static electricity, making hair smoother and easier to manage. In skincare, it can provide a temporary softening effect, but it is not a deep moisturizer or anti-aging treatment.
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
Steardimonium Hydroxypropyl 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 Steardimonium Hydroxypropyl 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 quaternary ammonium compound made by attaching a fatty chain (steardimonium) and a protein fragment (hydrolyzed collagen) to a hydroxypropyl linker. It is a conditioning agent used primarily in hair products.
How it works
The positively charged part of the molecule binds to the negatively charged surface of hair or skin, forming a thin film. This film reduces static, smooths the cuticle, and adds a soft, silky feel without heavy buildup.
Pros
Reduces static
Effectively minimizes flyaways and static electricity, making hair easier to style and less prone to frizz.
Lightweight feel
Provides a soft, silky finish without the heavy, greasy feeling that some conditioning agents can leave behind.
Cons and cautions
Potential buildup
With frequent use, especially without clarifying shampoos, it can accumulate on hair, leading to dullness or limpness.
Limited skin benefit
While it can temporarily soften skin, it does not provide meaningful hydration or anti-aging effects, so it is not a primary skincare ingredient.
Best for
- People with dry or frizzy hair
- Those looking for a lightweight conditioner
Use caution if
- Those with very fine or easily weighed-down hair
- Individuals seeking deep skin hydration
Usage tips
Safety summary
Generally recognized as safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic risk. Not intended for ingestion or contact with eyes.
Research notes
Limited peer-reviewed studies specifically on this ingredient. Its safety and function are inferred from broader research on quaternary ammonium compounds and hydrolyzed proteins. Cosmetic ingredient review panels have deemed similar compounds safe for use.
Common label clues
- Typical concentration
- 0.5% to 3%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Conditioners, Hair masks, Leave-in treatments, Shampoos
- Environmental note
- Derived from animal collagen (often bovine or fish) and modified synthetically. Vegan alternatives exist, such as plant-based quaternary ammonium compounds.
Good to know
- This ingredient is often found in combination with other conditioning agents like cetyl alcohol or dimethicone.
- It is not a protein treatment; it is a modified protein that primarily conditions rather than repairs.
Common questions
What is Steardimonium Hydroxypropyl Hydrolyzed Collagen in beauty products?
This ingredient is a modified protein derived from collagen. It has been chemically altered to carry a positive charge, which helps it stick to the negatively charged surface of hair strands. This reduces static electricity, making hair smoother and easier to manage. In skincare, it can provide a temporary softening effect, but it is not a deep moisturizer or anti-aging treatment.
What does Steardimonium Hydroxypropyl Hydrolyzed Collagen do in a beauty product?
The positively charged part of the molecule binds to the negatively charged surface of hair or skin, forming a thin film. This film reduces static, smooths the cuticle, and adds a soft, silky feel without heavy buildup.
Is Steardimonium Hydroxypropyl Hydrolyzed Collagen safe for most people?
Generally recognized as safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic risk. Not intended for ingestion or contact with eyes.
Who should be careful with Steardimonium Hydroxypropyl Hydrolyzed Collagen?
Those with very fine or easily weighed-down hair Individuals seeking deep skin hydration
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.