Selenium sulfide is an antifungal agent in shampoos for the treatment of dandruff and seborrheic dermatitis. It is available in micronized powder form. Selenium sulfide is not soluble in water but is soluble in Carbon disulfide. Suggested usages are 1% to 2.5% strength in shampoo. Selenium sulfide may also be used on the body to treat Tinea versicolor.