Nizoral anti dandruff shampoo is a gentle shampoo that is used to treat and prevent dandruff and seborrhoeic dermatitis fragrance free this product is fragrance free and dermatologically tested it is safe to use on color treated hair active ingredients nizoral anti dandruff shampoo contains the active ingredient ketoconazole also known as nizoral which prevents male hormones from being taken up by hair follicles it calms your scalp and improves hair health