Overview

Lysine is one of the nine essential amino acids in the human body, which act as the building blocks of proteins. Lysine is necessary to healthy growth and plays an essential role in the production of carnitine, which is critical to several processes in the human body, including healthy heart and brain function. Since the body cannot synthesize lysine, adequate levels of the amino acid must be obtained from dietary sources and supplementation. Our body's main source of lysine is a well-balanced diet. Good dietary sources of lysine are protein-rich foods such as eggs, meat (specifically red meat, lamb, pork, and poultry), soy, beans, peas, cheese (particularly Parmesan), and certain fish (such as cod and sardines). Lysine may be used for athletic performance, symptoms of diabetes, managing symptoms of the herpes virus (cold sores), and more. Lysine is taken orally, topically, or intravenously. According to research by Knopf et al1, there is evidence that lysine, when administered intravenously, can significantly increase the amount of circulating of growth hormones. This has led to athletes using lysine as a means of promoting muscle growth while training. L-lysine also helps the body to absorb calcium. Because of this, it is also used in the treatment of osteoporosis.
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Other Uses

Its use has been suggested for diabetes, stress, and athletic performance improvement. Lysine is a precursor of carnitine. It may also help the body absorb calcium and form collagen.