Ingredient review
Polyquaternium-93
INCI: Polyquaternium-93
A gentle conditioning polymer that smooths hair without heavy buildup, suitable for most hair types.
In plain English
Polyquaternium-93 is a synthetic polymer that coats the surface of hair strands. Think of it like a very thin, flexible film that wraps around each hair. This film helps reduce static electricity (which causes flyaways), makes hair feel softer to the touch, and can improve manageability. Unlike some older conditioning ingredients, it's designed to be lightweight and less likely to cause 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-93 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-93.
- 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-93 is a cationic (positively charged) polymer. It belongs to the polyquaternium family, a group of synthetic compounds widely used in hair and skin care for their conditioning and film-forming properties. Its positive charge helps it stick to the negatively charged surface of hair and skin.
How it works
When applied, the positive charge of Polyquaternium-93 is attracted to the negative charge on damaged hair or skin. This creates a thin, even film that smooths the hair cuticle (the outer layer of the hair shaft). This film reduces friction between strands, making hair easier to comb and less prone to breakage. It also neutralizes static charge, reducing frizz and flyaways.
Pros
Lightweight conditioning
Provides noticeable smoothness and softness without the heavy, greasy feel that some oils or silicones can leave, making it ideal for fine or easily weighed-down hair.
Effective static control
Its antistatic properties help reduce flyaways and frizz, especially in dry or low-humidity environments, leading to a more polished look.
Cons and cautions
Potential for buildup
Like all polymers, it can accumulate on hair over time, especially with daily use. This may lead to dullness or difficulty styling, particularly for those with low-porosity hair.
Synthetic origin
As a man-made polymer, it may not be preferred by consumers seeking natural or plant-based alternatives, though it is generally considered safe and well-tolerated.
Best for
- People with dry, damaged, or frizzy hair
- Those looking for a lightweight conditioner for fine hair
Use caution if
- Individuals with very low-porosity hair who experience buildup easily
- Those strictly avoiding all synthetic ingredients
Usage tips
Safety summary
Polyquaternium-93 is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. The Cosmetic Ingredient Review (CIR) panel has reviewed similar polyquaterniums and found them safe as used. No significant safety concerns have been reported.
Research notes
Research on polyquaterniums in general shows they are effective conditioning agents with good safety profiles. Specific studies on Polyquaternium-93 are limited, but its chemistry is well-understood and it is widely used in commercial products. Evidence supports its role as a mild, effective hair conditioner.
Common label clues
- Typical concentration
- 0.1% to 2% in rinse-off products; up to 5% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Conditioners, Leave-in treatments, Styling products, Shampoos
- Environmental note
- As a synthetic polymer, its biodegradability varies. Some polyquaterniums are not readily biodegradable, but Polyquaternium-93 is designed to be more environmentally friendly than older versions. Always check individual product formulations for environmental claims.
Good to know
- Polyquaternium-93 is often used in 'low-poo' or 'no-poo' hair care systems because it is milder than some older polyquaterniums.
- It is compatible with many other conditioning agents and can be found in both rinse-off and leave-on formulas.
Common questions
What is Polyquaternium-93 in beauty products?
Polyquaternium-93 is a synthetic polymer that coats the surface of hair strands. Think of it like a very thin, flexible film that wraps around each hair. This film helps reduce static electricity (which causes flyaways), makes hair feel softer to the touch, and can improve manageability. Unlike some older conditioning ingredients, it's designed to be lightweight and less likely to cause buildup over time.
What does Polyquaternium-93 do in a beauty product?
When applied, the positive charge of Polyquaternium-93 is attracted to the negative charge on damaged hair or skin. This creates a thin, even film that smooths the hair cuticle (the outer layer of the hair shaft). This film reduces friction between strands, making hair easier to comb and less prone to breakage. It also neutralizes static charge, reducing frizz and flyaways.
Is Polyquaternium-93 safe for most people?
Polyquaternium-93 is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. The Cosmetic Ingredient Review (CIR) panel has reviewed similar polyquaterniums and found them safe as used. No significant safety concerns have been reported.
Who should be careful with Polyquaternium-93?
Individuals with very low-porosity hair who experience buildup easily Those strictly avoiding all synthetic ingredients
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.