Pop Quiz: what is both a muscle AND an organ and packed with B vitamins, collagen, elastin, iron & essential fatty acids? Answer: you can find it in the heart. Not only is our beef heart jerky 100% sourced and manufactured in the USA with zero Chemicals, Fillers, Artificial anything, Hormones, Antibiotics, Byproducts, Dyes, Flavors or Preservatives -- what truly makes our Beef Heart Jerky different is this: we use real large slices of 100% human-grade beef heart and dehydrate them at their peak nutritional moment making them the perfect, healthy, all natural, nutrient dense treat for your pup. The best quality beef heart for your pup not only means the best muscle building proteins for stamina and endurance, but also 2x the collagen and elastin to help support healthy joints.