An intensive Biotin treatment to complete the H-24 three-phase system for thicker, fuller hair naturally. Contains concentrated and potent amounts of Biotin designed to be vigorously massaged into hair and scalp at least once a day after shampooing and conditioning. Fortified with Cysteine and Nucleic Acids, this potent emulsion helps energize hair and scalp and leaves hair stronger and full of body.2.0 ounce size