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L-Lysine HCI

Veterinarian Reviewed on February 5, 2014 by Paulina Nelega, RH
Posted in Uncategorized

L-Lysine HCI

Origin of L-Lysine

Lysine is an essential amino acid that cannot be produced by the body and must therefore be consumed with diet. It is scarce in vegetables and grains. People who are vegetarians must exercise caution with their dietary habits. It is necessary for humans to have an adequate intake of Lysine to sustain repair and growth of muscle tissue. It is also vital in the production of antibodies, hormones and enzymes. It can only enter the body through dietary protein such as meat and fish. Cheese, cod and sardines are especially high in lysine. Brewer’s yeast, legumes and some other dairy products also contain substantial amounts of lysine.


L-Lysine is primarily used in the treatment and prevention of cold sores that are caused by herpes simplex. It can be taken internally or applied to the skin. It is also taken to improve the performance of athletes.

In Japan lysine is used as a vital part of the diets in livestock. In most other countries it is used as a supplement. The increase in the consumption of meat is causing strains on the feed production. It is felt that portions of the problem would be using lysine and methionine. Meat protein contains more than vegetable protein.

Modern Uses

Lysine has been shown to be beneficial in the treatment of facial and oral herpes as well as genital herpes. Lysine has not been evaluated by the Federal Drug Administration for safety, purity or for dosage. Purchasing this supplement from a reliable source will decrease any risk.

There have been some studies that have shown that lysine in combination with vitamin C may reduce plaque in arteries. There have also been individuals who claim that it has lowered their blood pressure. There have been no conclusive scientific studies to prove or disprove these claims.

There are also claims that it assists the body with calcium absorption and decreases the quantity that is eliminated by the kidneys. There are researchers that have felt that it may help with bone loss. When used with l-arginine it activates the bone-building cells.

Forms available for L-Lysine

L-lysine is available in liquids, capsules, creams, and tablets.

Dosage of l-lysine

The recommended dose with herpes infections is 3000-9000mg/day in divided doses. For recurrence, it is recommended that 1000mg/day be taken in divided doses.


There is always the potential for side effects with prescribed medications. Before taking l-lysine, you should consult with a health care provider that is familiar with food supplements.

In the diet, it is safe. High doses have caused stones in the gall bladder.

You should not take l-lysine if you have liver or kidney disease without first consulting with your physician. The same precaution applies to women who are breastfeeding or pregnant.

Discussion with your health care provider is vitally important before beginning any supplements. While traditional physicians may not approve of any “natural” resources, reading and learning will help. Holistic practitioners are well versed in the administration of any of the supplements available.

Read also: Rosemary

Our Expert

Paulina Nelega, RH
Paulina Nelega, RH, has been in private practice as a Clinical Herbalist for over 15 years. She has developed and taught courses in herbal medicine, and her articles on health have appeared in numerous publications. She is very passionate about the healing power of nature. Ask Dr. Jan

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