L-Lysine Hcl Mono is a high-quality amino acid supplement that is commonly used for its health benefits. It is a form of L-lysine, an essential amino acid that the body cannot produce on its own, meaning it must be obtained through diet or supplementation. L-Lysine Hcl Mono is produced by combining L-lysine with hydrochloric acid resulting in a highly pure and bioavailable form of the amino acid. It is commonly used to support immune function, improve athletic performance, and promote healthy skin and hair.