Nutrition bars have graced store shelves for some time now, but the market continues to grow and innovations in their formulations and health benefits have evolved. “From the original homemade bars that became PowerBar and CLIF Bar, the nutrition bar market has become a $6.5 billion market in the U.S. dominated by General Mills, Kellogg’s, and CLIF Bar Co. with 50% market share among them,” says Max Maxwell, manager of market intelligence for Glanbia Nutritionals, who cites dat…