Ingredient dictionary

Bis-Aminopropyl Dimethicone

A silicone conditioning agent, a dimethicone with small nitrogen-based groups on its chain ends, used to smooth and soften hair. It is on the label of 2 products in our library. Checked against our library November 6, 2026.

The catch: silicones are safe and give slip and shine, but some people avoid them for curly-hair routines or to cut build-up.

Silicones. Smoothing film-formers ending in -cone or -siloxane, such as dimethicone.

What Bis-Aminopropyl Dimethicone does

Smooths the hair surface
Adds slip for easier detangling
Adds soft, light shine

Bis-Aminopropyl Dimethicone is a silicone, a polymer built on a backbone of silicon and oxygen atoms. It is a dimethicone with amine groups at the chain ends. Those amine groups give it a slight attraction to hair, so it tends to stay on the strands rather than rinsing away fully.

Formulators use it in shampoos and conditioners to smooth the hair surface and make hair easier to comb. It feels light and slippery rather than greasy. Because it clings to hair, it can build up with frequent use, so an occasional clarifying shampoo can help.

Good for

Shampoos and conditioners for people who want smoother, easier-to-comb hair without a heavy feel.

Frequently asked questions

Does bis-aminopropyl dimethicone cause build-up?

It can, with regular use. Because it clings to hair more than some silicones, a residue can slowly collect over time. If hair feels coated or dull, try a clarifying shampoo every so often. Using less product can also help.

Is it okay for curly hair?

Some people with curly hair enjoy silicones for slip and smoothness. Others avoid them, since they can leave a coating that weighs curls down over time. Check how your curls look after a few washes. If they seem flat or limp, skip silicone products for a while.