L-arginine is an amino acid that serves multiple purposes in the body, in both the cardiovascular and immune systems. While L-arginine is found naturally in several animal and plant-based foods, many people don’t receive enough to meet their needs. L-arginine has been shown to contribute to circulation through the production of nitric oxide, boosting ATP production in the body to provide energy to muscle groups, and helping to produce creatine. Nu U Nutrition offers 1000mg L-Arginine HCL supplements that are significantly stronger than other brands. Many brands hide their L-Arginine capsules' strength by declaring only the strength of a daily intake - ie multiple tablets per day. Ours are 1000mg per tablet or up to 4000mg of L-Arginine per day if you take 4 tablets daily. Ideal for those who live active and healthy lifestyles, our L-Arginine supplement contains L-arginine HCL (hydrochloride), the best available form of amino acid for optimal immune and cardiovascular support.