What is the typical concetration of surfactants in a basic shampoo? I have heard suggestions of 15-40%, which is a huge range. I have made shampoos with a concetration of 40% surfactants. but I think that may be too much. Am I using way to much surfactants in my shampoos? is 20-30% a better target?
Usually I use coco betaine, SCI powder, and Decyl glucoside, sodium lauroyl lactylate
But not I want to make a moisturizing SLES shampoo/bodywash with SLES, coco betaine, SCI powder, and glycol diserate. But think that 40% concentration of these surfactants is going to be drying.