Now L-Lysine Powder supports collagen synthesis. Lysine is an essential amino acid that has to be obtained through the diet or by supplementation. It is necessary for the production of all proteins in the body and for the maintenance of the structural proteins collagen and elastin. It helps form all connective tissues such as skin, tendon, and bone. Lysine is also a precursor to carnitine, which is needed for fat metabolism and energy production and may help to support a healthy immune system and proper cardiovascular function. Recommended Use: Take 1/4 level teaspoon daily, or as directed by a healthcare professional. Store in a cool, dry place after opening.