L-Lysine

What is L-Lysine?

Lysine is an amino acid building block of protein. Unlike some other amino acids, the human body cannot make lysine; therefore it must be eaten in the diet or supplemented. Sources of lysine include meat, fish, dairy, eggs, and some plants such as soy and other legumes.

Lysine is taken to preventing and treating cold sores. Lysine is also taken to improve athletic performance.