Ingredient review
Polyquaternium-28
INCI: Polyquaternium-28
Polyquaternium-28 is a gentle conditioning polymer that helps detangle hair and reduce frizz without heavy buildup.
In plain English
Polyquaternium-28 is a synthetic polymer that coats the hair shaft to reduce static electricity, making hair easier to comb and less prone to flyaways. It also forms a thin, flexible film that can improve the feel of hair and skin without leaving a sticky or greasy residue. Because it is water-soluble, it rinses out more easily than some other conditioning agents, which helps prevent product buildup over time.
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-28 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-28.
- 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-28 is a cationic (positively charged) polymer belonging to the polyquaternium family. It is created by reacting vinylpyrrolidone (a common film-forming monomer) with a quaternary ammonium compound, giving it both conditioning and antistatic properties. It is a clear to slightly hazy liquid at room temperature and is fully water-soluble.
How it works
The positive charge on the polymer chain is attracted to the negatively charged surfaces of hair and skin. This electrostatic attraction allows the polymer to deposit evenly, forming a thin, flexible film. The film smooths the hair cuticle, reduces friction between strands, and neutralizes static charge, which reduces flyaways and frizz. On skin, it can provide a silky after-feel without clogging pores.
Pros
Gentle detangling
Helps separate strands and reduce breakage during combing, especially on wet hair.
Low buildup
Water-soluble nature means it rinses out more completely than many silicones or oils, reducing the risk of limp or greasy hair over time.
Cons and cautions
Limited moisture
Provides smoothing and antistatic benefits but does not add significant moisture; dry hair types may need additional hydrating ingredients.
Foam reduction
At higher concentrations in shampoos, it can suppress lather, which some users may find less satisfying.
Best for
- People with frizzy or static-prone hair
- Those looking for a lightweight conditioner without heavy silicones
- Individuals with normal to oily hair who want detangling without greasiness
Use caution if
- People with very dry or damaged hair may prefer heavier conditioning agents
- Those with known sensitivity to quaternary ammonium compounds (rare)
Usage tips
Safety summary
Polyquaternium-28 has a low irritation and sensitization potential based on available safety data. It is considered safe for use in rinse-off and leave-on cosmetic products at typical concentrations. No significant health concerns have been identified in regulatory reviews.
Research notes
Studies on polyquaternium-28 focus on its conditioning efficacy and compatibility with anionic surfactants. It is well-documented in cosmetic formulation literature as a mild, effective antistatic agent. Peer-reviewed safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded it is safe for its intended uses.
Common label clues
- Typical concentration
- 0.1% to 2% in rinse-off products; up to 5% in leave-on formulations
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most other regions. Listed in the CosIng database and generally recognized as safe when used as directed.
- Common uses
- Conditioners, Shampoos, Hair masks, Leave-in treatments, Styling products
- Environmental note
- As a synthetic polymer, it is not readily biodegradable in all environments. However, its water solubility reduces persistence compared to some other film-formers.
Good to know
- Polyquaternium-28 is often used in combination with other conditioning agents to balance feel and performance.
- It is considered safe for color-treated hair as it does not strip dye.
Common questions
What is Polyquaternium-28 in beauty products?
Polyquaternium-28 is a synthetic polymer that coats the hair shaft to reduce static electricity, making hair easier to comb and less prone to flyaways. It also forms a thin, flexible film that can improve the feel of hair and skin without leaving a sticky or greasy residue. Because it is water-soluble, it rinses out more easily than some other conditioning agents, which helps prevent product buildup over time.
What does Polyquaternium-28 do in a beauty product?
The positive charge on the polymer chain is attracted to the negatively charged surfaces of hair and skin. This electrostatic attraction allows the polymer to deposit evenly, forming a thin, flexible film. The film smooths the hair cuticle, reduces friction between strands, and neutralizes static charge, which reduces flyaways and frizz. On skin, it can provide a silky after-feel without clogging pores.
Is Polyquaternium-28 safe for most people?
Polyquaternium-28 has a low irritation and sensitization potential based on available safety data. It is considered safe for use in rinse-off and leave-on cosmetic products at typical concentrations. No significant health concerns have been identified in regulatory reviews.
Who should be careful with Polyquaternium-28?
People with very dry or damaged hair may prefer heavier conditioning agents Those with known sensitivity to quaternary ammonium compounds (rare)
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.