Benefits of L-lysine & Ways to Avoid Its Deficiency

L-lysine is an amino acid (a building block of protein) that is essential for health. However, it cannot be manufactured naturally in the human body like other types of amino acids. Therefore, L-lysine, also called lysine, is considered as one of the eight essential amino acids.

In order to obtain lysine, one has to eat foods high in its content or take dietary supplements containing it. As a building block for protein, amino acids like L-lysine are necessary for normal growth and development. In particular, L-lysine is needed by the body to manufacture carnitine, a substance that is used in the conversion of fatty acids into energy. It also helps in calcium absorption and collagen formation which are important for muscle and bone health.

Foods that are high in L-lysine include high protein foods like nuts, red meat, eggs, milk, cheese, beans, and sardines. However, some people may need more than just the usual dietary food to supply their needs for lysine, such as athletes, body builders, vegetarians, and vegans. These people can get additional sources of L-lysine from nutritional supplements in the form of liquids, tablets, or capsules which are available in health stores or pharmacies.

L-lysine Benefits

L-lysine is an important and indispensable component of proteins. As previously mentioned, it plays a role in the production of carnitine and collagen. Its benefits include the following:

L-lysine Deficiency

There're various l-lysine benefits but what happens when one's diet is deficient in l-lysine? Some health problems have been found to be related to L-lysine deficiency such as kidney stone formation, low thyroid hormone production, asthma, chronic viral infections, and abnormal growth and development.

Symptoms related to a deficiency in this amino acid include nausea, fatigue, dizziness, anemia, and loss of appetite. Some disorders of the reproductive system have also been linked to a lack of l-lysine in the diet. To deal with L-lysine deficiency, you can take following steps.

Precautions of L-lysine Intake

Usually you can control your diet to get more l-lysine. But when you do need supplements know some precautions to better enjoy l-lysine benefits.

Intake Conditions

L-lysine supplements are often taken by vegans who do not eat food products containing animal protein, athletes who are highly active and bodybuilders who want more muscle mass. Patients who have large wounds, burns, or other medical conditions involving protein loss also need supplemental lysine for repair. Some people take l-lysine supplements to treat or prevent viral infections like cold sores and shingles.

Although lysine may be taken without prescription, it must be taken with caution to avoid side effects such as nausea, abdominal cramps, diarrhea, and stomach pain.


It is always best to ask your healthcare provider for advice regarding L-lysine supplementation, especially with regards to dosage. According to experts at the University of Maryland Medical Center, the usual recommended dose for people aged 13 years and above is 12 milligrams (mg) per kilogram (kg) of body weight per day.

For treating herpes infections, one may need a higher dosage, ranging from 3,000 - 9,000 mg, taken in divided doses, daily. To prevent recurrences, one may need to take 1,000 mg three times a day. Consult a physician for more information on proper dosage and duration of intake.


Experts recommend obtaining one's nutrients from a balanced diet that includes a variety of foods. One can obtain L-lysine supplements from online health stores or from health food stores without prescription, but one must be aware of the possible side effects of taking too much lysine.

L-lysine can interact with other substances when taken in large amounts, and can cause a deficiency in L-arginine, another important amino acid. Excessive doses can also lead to gallstone formation and increased cholesterol and triglyceride levels.

Pregnant and lactating women, patients with heart, liver, or kidney disease and those taking certain antibiotics should consult a physician before taking these supplements.

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