Kerastase Homme Capital Force Densifying Treatment spray for men contains the most effective formula to rebuild and thicken hair that is thin or suffering loss. The active ingredients, D-biotin, taurine, arginine, and ceramide, perform magic on the scalp and hair and are part of the Systeme Taurine formula. After just one use of this densifying spray treatment, you can start to notice a difference in the thickness of your hair.