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L-Lysine HCI

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Lysine is an essential amino acid that cannot be produced by the body and must therefore be obtained from the diet or by supplementation.

Lysine is vital in the production of antibodies, hormones, and enzymes and an adequate daily intake is necessary to sustain repair and growth of muscle tissue. Dietary sources of L-Lysine include high-protein foods such as legumes, eggs, fish, meat and cheese.


L-Lysine is primarily used in the treatment and prevention of cold sores caused by the herpes simplex virus. It has been shown to be beneficial in the treatment of both oral and genital herpes.

Lysine has also been found beneficial for the treatment of shingles, a painful condition caused by a virus in the same family as the herpes virus.

Lysine can be taken internally as well as applied to the skin for these conditions.

It has also been used by athletes to improve performance.

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 lysine assists the body with calcium absorption and decreases the amount that is eliminated by the kidneys, which some researchers suggest may help with bone loss. When used with l-arginine, lysine activates the bone-building cells (osteoclasts).

Lysine has not been evaluated by the Federal Drug Administration for safety, purity or for dosage. Purchasing this supplement from a reliable source is therefore a wise consideration.

Forms of L-Lysine Available

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

Dosage of L-Lysine

The recommended dosage for herpes infections is 3000-9000 mg/day, taken in divided doses. For helping to prevent cold sore recurrence, it is recommended that 1000 mg/day be taken in divided doses.

For shingles, a dosage of 3000 mg daily in divided doses, for 2 weeks, has been found helpful.


There is always the potential for side effects with any medication or supplement. Before taking L-lysine, consult with your health care provider.

Those with liver or kidney disease should not use lysine without first consulting their physician. The same precaution applies to women who are breastfeeding or pregnant.

Discussion with your health care provider is important before beginning any supplements.

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