Lysine is an essential amino acid that the body cannot produce itself. The organism produces many proteins from it. It is also involved in bone growth, cell division and wound healing, because it is involved in the formation of collagen (building block of connective tissue) and stimulates cell division. Deficiency can result in reduced enzyme activity, growth disorders and a weakened immune system.
Lysine is found in particularly large quantities in protein-rich foods such as meat, fish, eggs and dairy products. Vegetables, on the other hand, with the exception of legumes (e.g. beans, peas, lentils), contain little lysine.