Kellogg's Special K Protein Meal Bars, 6 Pack, Chocolate Peanut Butter
New recipe. Get more with your protein. Magnesium: To support protein metabolism and help power muscles by releasing fuel from internal stores. Calcium: To help muscle function and support bone health. Vitamin D: To support protein synthesis and help keep calcium readily accessible for your body. These essential nutrients work with protein to help support lean muscle & strong bones. Kellogg's Family Rewards.