well @Belassi swifty reccommended it on her blog. from my understanding it is to increase mildness for dry hair and add some emolliency. i was also using it as an opacifier. together with the glycol diserate a white pearly shampoo was the result.
@Perry I was using polyquat 10 to thicken the shampoo. without it the product was a little on the thin side. I also have cationic guar. would that be a better addition instead?