Lysine, or L-lysine, is an essential amino acid in the protein of foods such as wheat germ, beans, yogurt and animal products. Amino acids play a role in energy production and your body's absorption of calcium. While most people get enough lysine through protein-rich foods, people who have low levels of lysine may need lysine supplements. Before taking lysine, talk to your obstetrician about the dangers and side effects of amino acid supplements.
Function
Lysine helps your body make carnitine, an amino acid that helps convert fatty acids into fuel for the body. This process may help lower cholesterol levels. Lysine also plays a role in the development of collagen, proteins found in the skin, cartilage and tendons. The dietary supplement may help treat genital herpes and cold sore outbreaks by preventing the virus from replicating. Lysine also contributes to calcium absorption and retention, which may help prevent bone loss.
Side Effects
Common side effects of lysine supplements include abdominal pain, diarrhea and upset stomach. Taking high dosages of lysine may cause a build-up of the amino acid and increase your risk of gallstones, which can be extremely painful and uncomfortable. Although rare, lysine supplements may cause a severe allergic reaction. Seek immediate medical attention if you experience symptoms of an allergic reaction such as hives, facial swelling, difficulty breathing or itching.
Dietary Sources
A nutrient-rich diet is the best way to obtain essential amino acids. Eating foods containing lysine, such as legumes, nuts and eggs, is considered safe during pregnancy. Lysine-rich foods also provide other nutrients essential for you and your growing baby. Vegetarians and vegans may be at risk of lysine deficiency if their diet lacks protein. As of 2011, there is no daily recommended value of lysine found in food.
Warning
Pregnant women should avoid taking lysine due to the lack of research on the effects of lysine supplements during pregnancy. Avoid using lysine supplements if you have liver disease, gallstones, high cholesterol or are taking certain medications. Although many people are able to take lysine supplements without problems, always consult your physician before using dietary supplements during pregnancy.
