Milk-based yogurt and soymilk-based yogurt were formulated from milk, soy milk and activated carbon treated soymilk containing 3-5% (w/w) added whey protein concentrate (WPC) or nonfat dry milk (NFDM) and fermented with commercial yogurt bacteria culture. The activated carbon process was relatively ineffective for removing phe- nolic compounds and off-flavors from soymilk. WPC and NFDM both functioned well as ingredients for formulating soymilk-based yogurt products that compared well with milk-based yogurt in every aspect studied except for a lack of typical yogurt and acidity flavors and the presence of soy off-flavors.