Pure® Encapsulations L-Lysine provides the amino acid lysine. Lysine is an essential amino acid, meaning it cannot be synthesized by the human body. It is a necessary nutrient for the synthesis of proteins, antibodies, and the structural formation of collagen. Each capsule provides the biologically active L-isomer of the amino acid lysine. Directions: People looking to increase the contribution of this amino acid to the body. How to use: 2 capsules between meals. Caution: Do not take during pregnancy, breastfeeding, or for extended periods of time. If you have any health conditions or are taking any medications, consult your healthcare professional before using this supplement. Conservation: Store in a cool, dry place.