Hearts are high in natural taurine and make an excellent treat or topper! Taurine  Dr Karen Becker DVM says, “Taurine, especially essential for cats, is an important amino acid for liver and gallbladder support. It’s essential for optimal blood flow, eye health, cardiovascular health, and the production of bile in both cats and dogs. Pets with less-than-optimal levels of taurine may be at greater risk of adverse effects from toxins. Although a minimal level of taurine is included in most commercial pet foods, taurine is easily depleted in stressed pets”.