(a) Combination of active ingredients for the control of dandruff. Salicylic acid identified in Sec. 358.710(a)(4) may be combined with sulfur identified in Sec. 358.710(a)(7) provided each ingredient is present within the established concentration and the product is labeled according to Sec. 358.750.
(b) Combination of control of dandruff and external analgesic active ingredients. Coal tar identified in Sec. 358.710(a)(1) may be used at a concentration of 1.8 percent coal tar solution, on a weight to volume basis, in combination with menthol, 1.5 percent, in a shampoo formulation provided the product is labeled according to Sec. 358.760. [72 FR 9852, Mar. 6, 2007]