Sports and protein drinks are transitioning from being separate categories into one overall sports performance market, experts say.  

Cytosport, the Benicia, Calif.-based parent company of Muscle Milk and Muscle Milk Light, launched Muscle Milk Light Peach Mango in 14-ounce ready-to-drink bottles. Peach Mango is the first Muscle Milk Light beverage option to be naturally flavored and sweetened with stevia, monk fruit and cane sugar, the company says.