Ingredient review
Quaternium-70
INCI: Quaternium-70
Quaternium-70 is a synthetic conditioning ingredient that helps reduce frizz and static in hair, but it may not suit those with very fine or easily weighed-down hair.
In plain English
Quaternium-70 is a positively charged molecule that sticks to the negatively charged surface of hair strands. This helps smooth the hair cuticle, reduce static electricity, and make hair feel softer and easier to comb. It's commonly found in rinse-off hair products like conditioners and shampoos.
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
Quaternium-70 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 Quaternium-70.
- 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
Quaternium-70 is a quaternary ammonium compound, a type of synthetic ingredient designed to condition hair by reducing static and improving slip.
How it works
It works by depositing a thin, positively charged film onto the hair shaft, which neutralizes negative charges that cause flyaways and static. This film also helps lubricate the hair, making it easier to detangle and style.
Pros
Effective static control
Quaternium-70 neutralizes static charges, reducing flyaways and making hair easier to manage, especially in dry or winter conditions.
Improves wet combing
It provides slip that helps detangle hair without pulling or breaking strands, which is especially helpful for curly or tangled hair.
Cons and cautions
Potential buildup
Over time, Quaternium-70 can accumulate on hair, leading to dullness or a heavy feel, particularly on fine or low-porosity hair.
May cause dryness
Some users report that frequent use can leave hair feeling dry or brittle, possibly due to over-deposition or interaction with other ingredients.
Best for
- People with frizzy or static-prone hair
- Those looking for extra slip and detangling in conditioners
Use caution if
- Individuals with very fine or easily weighed-down hair
- Those with sensitive scalp prone to irritation from quats
Usage tips
Safety summary
Quaternium-70 is generally recognized as safe for use in rinse-off hair products at typical concentrations. It has low irritation and comedogenic potential, but some individuals with sensitive skin or fine hair may experience buildup or dryness.
Research notes
Research on Quaternium-70 is limited, but it is structurally similar to other quaternary ammonium compounds that have been studied for hair conditioning and safety. Regulatory bodies consider it safe for cosmetic use at intended levels.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets, with concentration limits typically set by good manufacturing practices.
- Common uses
- Shampoos, Conditioners, Leave-in treatments, Hair masks
- Environmental note
- As a synthetic quaternary ammonium compound, Quaternium-70 may not be readily biodegradable; however, it is used in low concentrations in rinse-off products.
Good to know
- Quaternium-70 is often listed alongside other quats in ingredient lists, so check for multiple conditioning agents if you have fine hair.
- It is considered safe for use in rinse-off products at typical concentrations.
Common questions
What is Quaternium-70 in beauty products?
Quaternium-70 is a positively charged molecule that sticks to the negatively charged surface of hair strands. This helps smooth the hair cuticle, reduce static electricity, and make hair feel softer and easier to comb. It's commonly found in rinse-off hair products like conditioners and shampoos.
What does Quaternium-70 do in a beauty product?
It works by depositing a thin, positively charged film onto the hair shaft, which neutralizes negative charges that cause flyaways and static. This film also helps lubricate the hair, making it easier to detangle and style.
Is Quaternium-70 safe for most people?
Quaternium-70 is generally recognized as safe for use in rinse-off hair products at typical concentrations. It has low irritation and comedogenic potential, but some individuals with sensitive skin or fine hair may experience buildup or dryness.
Who should be careful with Quaternium-70?
Individuals with very fine or easily weighed-down hair Those with sensitive scalp prone to irritation from quats
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.