Selsun Blue is an over-the-counter brand of dandruff shampoo now owned by Sanofi-Aventis. First made by Abbott Laboratories, the brand was bought in Chattem in 2002. Chattem was acquired by Sanofi-Aventis in 2010. Chattem announced that on November 1, 2005, they would introduce a new line of shampoos under the brand name Selsun Salon. These contained a different active ingredient as Selsun Blue, pyrithione zinc 1%, and are oriented toward the higher-end shampoo market.