With most thickening shampoos I expect a bit of tingle to help stimulate the scalp that was missing from this shampoo.  Nice fragrance, cleans hair well but didn't really notice much of a difference in the hair after a week of use.  After trying Aveda's Invati, this product, Billy Jealousy and probably some others the Aveda gave the healthiest-looking results and will probably be the one we return to.