23 g TriSource protein. Helps build a lean body and provides sustained energy. PowerBar ProteinPlus is the only protein bar made with TriSource Protein, PowerBar's proprietary three protein blend. TriSource Protein Blend combines whey, soy and casein proteins which are absorbed by the body at different rates to deliver a steady supply of muscle building amino acids to support muscle growth and help reduce muscle breakdown. TriSource = soy + wheat + casein proteins.