Section 333.310 - Acne active ingredientsThe active ingredient of the product consists of any of the following:
(a) Benzoyl peroxide, 2.5 to 10 percent.(b) Resorcinol, 2 percent, when combined with sulfur in accordance with § 333.320(a) .(c) Resorcinol monoacetate, 3 percent, when combined with sulfur in accordance with § 333.320(b) .(d) Salicylic acid, 0.5 to 2 percent.(e) Sulfur, 3 to 10 percent.(f) Sulfur, 3 to 8 percent, when combined with resorcinol or resorcinol monoacetate in accordance with § 333.320 . 75 FR 9776 , Mar. 4, 2010