Ingredient review
Bis-Hydroxyethyl Dihydroxypropyl Stearammonium Chloride
INCI: Bis-Hydroxyethyl Dihydroxypropyl Stearammonium Chloride
A gentle synthetic conditioner that reduces static and softens hair without heavy buildup.
In plain English
This ingredient is a type of positively charged molecule that sticks to the negatively charged surface of hair and skin. It helps reduce static electricity, makes hair feel smoother and easier to comb, and can leave skin feeling soft. It is considered milder than some older conditioning agents.
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
Bis-Hydroxyethyl Dihydroxypropyl Stearammonium Chloride 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 Bis-Hydroxyethyl Dihydroxypropyl Stearammonium Chloride.
- 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 salt (a 'quat') synthesized from stearic acid (a fatty acid found in animal or plant fats) and modified with hydroxyethyl and dihydroxypropyl groups to improve water solubility and mildness.
How it works
Its positive charge binds to the negative charge on damaged hair or skin, forming a thin film that reduces friction, static, and flyaways. This film also helps retain moisture and improves the feel of the product during application.
Pros
Gentle conditioning
Compared to older quats like stearalkonium chloride, this ingredient is less likely to cause irritation or buildup, making it suitable for daily use on fine or color-treated hair.
Static control
Its strong positive charge effectively neutralizes static electricity, reducing frizz and flyaways even in dry or low-humidity environments.
Cons and cautions
Not fully biodegradable
While milder than some quats, this ingredient may not break down quickly in all wastewater treatment systems, raising environmental concerns.
Potential sensitivity
A small number of people with very sensitive skin or scalp may experience mild irritation or itching, especially with leave-on products.
Best for
- People with dry or damaged hair needing extra conditioning
- Those who want a lightweight conditioner that won't weigh hair down
Use caution if
- Individuals with known sensitivity to quaternary ammonium compounds
Usage tips
Safety summary
Generally recognized as safe for use in rinse-off and leave-on products at typical concentrations. Mild and well-tolerated by most skin types, though patch testing is recommended for those with sensitive skin.
Research notes
Limited peer-reviewed studies specifically on this ingredient, but extensive safety data exists for the broader class of quaternary ammonium compounds. The CIR has deemed similar ingredients safe when formulated appropriately.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has reviewed similar quats and found them safe at typical use levels.
- Common uses
- Conditioners, Hair masks, Leave-in treatments, Shampoos, Body washes
- Environmental note
- As a synthetic quat, it may have moderate persistence in aquatic environments. Some manufacturers are developing more biodegradable alternatives.
Good to know
- This ingredient is often listed near the middle or end of an ingredient list because it is used at low concentrations.
- It is compatible with most anionic surfactants (like sodium lauryl sulfate) but works best in slightly acidic pH formulations.
Common questions
What is Bis-Hydroxyethyl Dihydroxypropyl Stearammonium Chloride in beauty products?
This ingredient is a type of positively charged molecule that sticks to the negatively charged surface of hair and skin. It helps reduce static electricity, makes hair feel smoother and easier to comb, and can leave skin feeling soft. It is considered milder than some older conditioning agents.
What does Bis-Hydroxyethyl Dihydroxypropyl Stearammonium Chloride do in a beauty product?
Its positive charge binds to the negative charge on damaged hair or skin, forming a thin film that reduces friction, static, and flyaways. This film also helps retain moisture and improves the feel of the product during application.
Is Bis-Hydroxyethyl Dihydroxypropyl Stearammonium Chloride safe for most people?
Generally recognized as safe for use in rinse-off and leave-on products at typical concentrations. Mild and well-tolerated by most skin types, though patch testing is recommended for those with sensitive skin.
Who should be careful with Bis-Hydroxyethyl Dihydroxypropyl Stearammonium Chloride?
Individuals with known sensitivity to quaternary ammonium compounds
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.