L-Lysine is a building block for proteins. This amino acid assists in calcium absorption, it maintains the correct nitrogen balance in the body, and maintains lean body mass. Lysine is also needed to produce disease-fighting antibodies, hormones, enzymes, collagen formation, and is vital to the repair of tissue. Lysine can be found in numerous foods, but the richest sources include red meats, fish, and dairy products (milk, eggs, cheese). Beans, peas and lentils are also a good source.
Due to its ability to help repair tissue, Lysine is often given to patients recovering from injuries and recovery after operations. It is possible that Lysine may help maintain healthy blood vessels. Doctors prescribe Lysine to people with cold sores, shingles, and genital herpes. Current scientific studies are being conducted as to Lysine’s effectiveness in lowering cholesterol and improving athletic performance.
Vegetarians whose diets contain large amounts of grains and only minimal amounts of beans could become deficient in Lysine, people recovering from burns, and athletes involved in frequent vigorous exercise have increased need for essential amino acids.
Lysine is safe when taken in the recommended doses; however, in large doses (10-30g a day), this amino acid increases the toxicity of aminoglycoside antibiotics such as gentamicin, neomycin, and streptomycin. Side effects such as abdominal cramping and diarrhea are rare, but can happen when taking larger doses. Do not take this supplement if you have diabetes or severe liver or kidney disease.