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Lysine is an essential amino acid (which means you need it but you must get it from food) and is important for proper growth, absorption of calcium, the production of hormones and enzymes, and the formation of collagen, which is a critical element in bones and connective tissues. It also is an essential player in the production of carnitine, a nutrient that converts fatty acids into energy and helps lower cholesterol.
Lysine can help enhance the ability of other supplements, such as pygeum and saw palmetto, to block production of DHT (dihydrotestosterone). Elevated levels of DHT are associated with an increased risk of BPH and possibly prostate cancer. Most people have no trouble getting all the lysine they need from their diet, although if you are very active or athletic, you may need a bit more. Some people take lysine when they are recovering from a sports injury or surgery. The suggested daily requirement for lysine is 1 to 1.5 grams. A deficiency of lysine can cause fatigue, nausea, dizziness, loss of appetite, bloodshot eyes, anemia, and reproductive disorders. You can avoid a deficiency by eating plenty of foods that are rich in lysine, such as beans, peas, lentils, and fish.
Lysine supplements are available in tablets, capsules, creams, and liquids, and are usually sold in the L-lysine form. The suggested dose for adults is 12 mg per kilogram per day. (University of Maryland) High doses of lysine have caused gallstones and elevated cholesterol in animals. If you are also taking arginine, high levels of this amino acid may lower lysine levels in the body.
Reference
University of Maryland Medical Center:
http://www.umm.edu/altmed/articles/lysine-000312.htm
