Nutrition and Supplements Amino acids Life Extension L-Lysine 620 mg 100 Vegetable Capsules Lysine is an essential amino acid necessary for growth and to help maintain nitrogen balance in the body. It can help promote proper nitrogen balance in the body and inhibit glycation, the binding of a sugar and protein or lipid molecule accelerated by elevated blood sugar levels. Lysine has many functions in the body, as it is incorporated into many proteins, which are used for a variety of purposes. Most people consume adequate amounts of lysine. However, vegetarians whose diets contain large amounts of grains and only trace amounts of grains may be deficient in lysine. Athletes who participate in frequent vigorous exercise have an increased need for essential amino acids, although most diets meet these increased needs. Lysine supplementation has been shown to increase the absorption and retention of calcium. Lysine works with other essential amino acids to support growth, lean body mass and the body's store of nitrogen. Additionally, dietary supplementation with the essential amino acid L-lysine has been shown to promote relaxation in humans with low dietary intakes of L-lysine. L-lysine, along with arginine, has been documented to promote healthy hormonal stress responses in humans.