Ingredient review
Polyquaternium-97
INCI: Polyquaternium-97
Polyquaternium-97 is a gentle, film-forming polymer that smooths hair and skin without heavy buildup, making it a reliable choice for daily conditioning.
In plain English
Polyquaternium-97 is a man-made polymer that coats the surface of hair or skin to reduce static electricity and make strands feel softer and smoother. It works by forming a thin, flexible film that helps detangle hair and adds a silky slip to products like conditioners and leave-in treatments. Because it's water-soluble, it rinses off easily and doesn't tend to build up like some heavier silicones or waxes.
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
Polyquaternium-97 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 Polyquaternium-97.
- 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
Polyquaternium-97 is a cationic (positively charged) polymer from the polyquaternium family, designed to adhere to negatively charged hair and skin surfaces. It is synthetically produced and optimized for mild conditioning and antistatic properties.
How it works
The positive charge on Polyquaternium-97 binds to the negatively charged surface of hair or skin, creating a thin, even film. This film reduces friction between strands, minimizes flyaways, and improves the sensory feel of the product. In skin care, it can provide a temporary smoothing effect and help other ingredients spread more evenly.
Pros
Lightweight conditioning
Polyquaternium-97 provides a smooth, silky feel without the heavy buildup that can weigh down fine hair or leave a greasy residue.
Static control
Its antistatic properties help tame flyaways and reduce frizz, especially in dry or low-humidity environments, making hair easier to manage.
Cons and cautions
Potential for buildup
While generally low buildup, frequent use of high-concentration products may lead to a slight coating that can dull hair over time, requiring a clarifying wash.
Not fully biodegradable
Polyquaternium-97 is not readily biodegradable in all environments, though it is considered safe for aquatic life at typical use levels. Eco-conscious users may prefer more biodegradable alternatives.
Best for
- People with fine or easily weighed-down hair who want light conditioning
- Anyone looking to reduce static and frizz in humid or dry climates
Use caution if
- Those with very sensitive or allergy-prone skin may want to patch test, as some polyquaterniums can cause irritation in rare cases
Usage tips
Safety summary
Polyquaternium-97 has a low irritation and comedogenic risk, making it suitable for most skin and hair types. Rare allergic reactions are possible, so patch testing is recommended for sensitive individuals.
Research notes
Polyquaternium-97 is a well-established conditioning polymer with moderate evidence supporting its efficacy in reducing static and improving hair feel. Safety assessments by the CIR panel confirm its low risk at typical use concentrations.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. The Cosmetic Ingredient Review (CIR) panel has evaluated polyquaterniums and found them safe as used.
- Common uses
- Conditioners, Leave-in treatments, Styling products, Shampoos, Body washes
- Environmental note
- Polyquaternium-97 is not readily biodegradable, but it is not classified as a persistent environmental pollutant. Manufacturers are encouraged to use it at effective but minimal levels.
Good to know
- Polyquaternium-97 is often used in '2-in-1' shampoos to provide conditioning without a separate conditioner step
- It is considered safe by the Cosmetic Ingredient Review (CIR) panel at typical use levels
Common questions
What is Polyquaternium-97 in beauty products?
Polyquaternium-97 is a man-made polymer that coats the surface of hair or skin to reduce static electricity and make strands feel softer and smoother. It works by forming a thin, flexible film that helps detangle hair and adds a silky slip to products like conditioners and leave-in treatments. Because it's water-soluble, it rinses off easily and doesn't tend to build up like some heavier silicones or waxes.
What does Polyquaternium-97 do in a beauty product?
The positive charge on Polyquaternium-97 binds to the negatively charged surface of hair or skin, creating a thin, even film. This film reduces friction between strands, minimizes flyaways, and improves the sensory feel of the product. In skin care, it can provide a temporary smoothing effect and help other ingredients spread more evenly.
Is Polyquaternium-97 safe for most people?
Polyquaternium-97 has a low irritation and comedogenic risk, making it suitable for most skin and hair types. Rare allergic reactions are possible, so patch testing is recommended for sensitive individuals.
Who should be careful with Polyquaternium-97?
Those with very sensitive or allergy-prone skin may want to patch test, as some polyquaterniums can cause irritation in rare cases
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.