Formulated by a dermatologist Reverse and prevent hair loss. Inhibits DHT production. Encourage hair growth. Revivogen bio cleansing shampoo is a dermatologist formulated gentle cleansing shampoo for fine and thinning hair. Sulfate free, safe for color and chemically treated hair this thickening shampoo volumizes the hair while cleansing DHT and sebum from the scalp. Best results against hair loss are seen when used in conjunction with the natural scalp therapy treatment.