Ingredient dictionary

Behentrimonium Methosulfate

Behentrimonium methosulfate is a conditioning ingredient with a long fatty chain that softens, smooths and reduces static, especially in hair products. It is on the label of 27 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Behentrimonium Methosulfate does

Softens and smooths the feel
Reduces static and tangling
Adds slip in creams and lotions

Behentrimonium methosulfate is a quaternary ammonium compound, a group of molecules that carry a positive charge. Its long chain comes from behenyl alcohol, which is often made from plant oils, and the methosulfate part simply balances the charge.

Because it is positively charged, it clings to hair and skin, which tend to carry a slight negative charge. It leaves a thin, smooth film that softens hair, reduces static and helps it detangle. In creams and lotions it adds slip and a silky feel. It feels light and slippery rather than greasy. It turns up most often in cleansers, sunscreens, moisturizers, body lotions and exfoliants, and is also well known in hair conditioners.

Good for

Suits people who like soft, slippery creams, lotions and conditioners, and anyone whose hair tangles or feels dry.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is behentrimonium methosulfate safe for sensitive skin?

Most people tolerate it well. Like any ingredient, it may bother very sensitive skin, so patch testing a new product on a small area first is a sensible habit.

Does behentrimonium methosulfate make hair greasy?

No. It is used to make hair feel softer and smoother without a heavy coating. Because it works on the surface, a small amount goes a long way, and it rinses out well in rinse-off products.