Sulfa Derm - 1500 mg x 90 ct Sulfa Derm is a sulfa-amino based supplement that is specifically formulated for dogs with chronic skin and coat problems, such as dry, itchy skin or excessive shedding. Sulfa Derm combines L-Cysteine and L-Methionine (sulfur-containing amino acids) with five B-complex vitamins, biotin, zinc and silica, all of which are necessary for healthy skin and radiant coats. Made with a pleasant natural hickory flavor that your dog will love.