Natural Factors L-Taurine - 1000 mg - A conditionally essential amino acid used to support cardiovascular function. L-taurine is considered a non-protein amino acid because it is not used to synthesize the body’s proteins. Instead, this sulfur-containing nutrient is found in an unbound form throughout the body. Taurine is the most abundant amino acid in the heart and is also found in the brain, nervous system, and muscles. Supplementation assists with the body’s fat metabolism and regulates ion levels across membranes. As a free-form amino acid, L-taurine is more effective than the form obtained directly from food.