Sebo Balancing Shampoo Cleans deeply, in a targeted and delicate manner. Zinc PCA helps eliminate excess sebum. Hair looks light and vital. SALICYLIC ACID: Prepares the skin to receive the treatment and improves cell replacement. ZINC PCA: regulates the cutaneous enzymatic system. Excessive sebum production makes skin oily and hair heavy. The excessive presence of sebum alters the correct skin pH, generating bacterial and microbial production. It is therefore necessary to regulate the functioning of the sebaceous gland, remove excess sebum and hydrate the scalp and hair.