This laboratory-tested, gentle cleanser stops dandruff while controlling scalp dermatitis and mild psoriasis. Featuring JASON\'s unique combination of FDA compliant dandruff-control ingredients plus nourishing essential oils of Rosemary, Olive and Jojoba, this medicated cleanser soothes, heals and moisturises while it eliminates flakes and itchiness. MSM (methylsulfonylmethane) rebalances and conditions the scalp to prevent future dandruff. JASON Dandruff Relief Treatment Shampoo controls recurrence of flaking, scaling and itching associated with dandruff. Helps prevent seborrheic dermatitis. Frostified with MSM, Olive, Rosemary Oils & Colloidal Sulfur. No Parabens, SLS or Phthalates. JASON is a PETA certified cruelty-free brand; they do not test any of their products on animals.