Quaternium-73

Quaternium-73 is a positively charged conditioning polymer (a quaternary ammonium compound) derived from natural materials. It functions primarily as an antistatic agent, helping to neutralise the negative electrical charge that builds up on hair and skin surfaces, which can cause frizz, tangles, and uneven texture.In skincare formulations, it is typically used in products designed to condition or smooth the skin surface, though it is more commonly found in hair care. Its role is largely cosmetic rather than therapeutic — it improves the sensory feel and appearance of a product on the skin.

Quaternium-73 works by depositing a thin, positively charged film onto the skin surface. This charge counteracts the natural negative charge present on skin and hair, which is responsible for static build-up and the associated rough or frizzy appearance. By neutralising this charge difference, the ingredient helps the surface of skin appear more uniform and smoother.The polymer also has mild conditioning properties, meaning it can coat and soften the outer layer of the skin without necessarily penetrating deeper layers.

Quaternium-73 is a rinse-off or leave-on ingredient depending on the product type. In rinse-off formulations (shampoos, cleansing products), it deposits its benefits during use and is washed away. In leave-on products (serums, creams, conditioners), it remains on the skin to provide ongoing antistatic and smoothing effects. There is no special timing or layering consideration required — use as you would any other product in your routine.

Quaternium-73 is generally well-tolerated and recognised as safe for use in cosmetics by regulatory bodies including the EU and FDA. It is unlikely to cause irritation at typical use levels, though individuals with known sensitivity to conditioning polymers should patch-test first.