Selsun Blue is an over-the-counter brand of dandruff shampoo now owned by Sanofi. Made by Abbott Laboratories, the brand was later bought by Chattem in 2002. Chattem was acquired by Sanofi in 2010, although in some markets, it is sold by Rohto Pharmaceutical instead. Selsun Blue has been marketed as a more effective alternative to brand leader Head & Shoulders due to its superior performance in randomized trials.