Gentle & Effective Thickening Shampoo - FOAMIST Thickening Caffeine shampoo gently cleanses excess oil and removes buildups to activate and revitalize hair from scalp to ends. Fuller Thicker Hair - Our thickening caffeine shampoo not only effectively cleanses the scalp, but also promotes hair growth. It is explicitly designed to gently deep cleanse and stimulate the scalp to nourish and revitalize the hair to volumize thin hair and improve the strength of hair strings.