Lysine (Amino Acid)
Lysine:

Lysine is an essential amino acid, which means that it is essential
to human health but cannot be manufactured by the body. For
this reason, lysine must be obtained from food. Amino acids are
the building blocks of protein.

Good sources of lysine are foods rich in protein including meat
(specifically red meat, pork, and poultry), cheese (particularly
parmesan), certain fish (such as cod and sardines), nuts, eggs,
soybeans (particularly tofu, isolated soy protein, and defatted
soybean flour), spirulina, and fenugreek seed. Lysine is available
in tablets, capsules, creams, and liquids, and is usually sold in the
L-lysine form.

It is required for growth and bone development in children, assists
in calcium absorption and maintaining the correct nitrogen
balance in the body and maintaining lean body mass.
Furthermore it is needed to produce antibodies, hormones,
enzymes, collagen formation as well as repair of tissue.
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Since it helps with the building of muscle protein, it is useful for patients recovering from injuries and recovery after operations,
and there might be use in lysine to help maintain healthy blood vessels. It also seems to assist in fighting herpes and cold sores.

The idea that lysine might work against herpes has some plausibility. In order to replicate, the herpes virus requires arginine,
another amino acid that's common in foods and necessary to human life; but lysine is thought to interfere with the absorption of
arginine in the intestine. It's a long way from this observation to a herpes cure, and most studies have been inconclusive. A
small study conducted at the Baylor College of Dentistry in 1984 did show that lysine supplements-1,000 milligrams a
day-helped reduce recurrences of cold sores.

L-lysine helps improve the absorption of calcium from the digestive tract and prevent loss of calcium in the urine. In so doing,
some researchers speculate that L-lysine may help prevent bone loss associated with osteoporosis. In addition, test tube
studies suggest that L-lysine in combination with L-arginine (another amino acid) increases the activity of bone-building cells
and enhances production of collagen.

Athletes, burn patients and people suffering from herpes and cold sores may benefit from an increase of lysine.

Older people could also require more lysine, as one study found older men required more of this nutrient than younger men.

Toxicity has not been determined but animals fed high amounts of lysine, have shown a tendency to gallstones as well as
elevated cholesterol - but these tendencies have not been proven in humans.

Diarrhea and stomach cramps may be indicative in high dosage, but these are not consistent symptoms.
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