Redbarn's Protein Puffs are loaded with a milk-based protein derived from human-grade caseinate commonly used in health supplements, snacks, protein bars, and diet products. Chicken Protein Puffs for cats are sugar-free, grain-free treats cats actually love. We deliver unique combinations of protein, natural ingredients, and essential amino acids and baked without artificial preservatives, flavors, or colorings. Not to mention, the texture of our protein puffs is crispy and airy, just what cats crave!.