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Lysine is an essential amino acid, which means it must be obtained through the diet as the human body cannot produce it. It plays a critical role in various biological processes including protein synthesis, enzyme production, and the absorption of calcium. Lysine is also important for the production of collagen, which is crucial for healthy skin, tendons, and cartilage. Additionally, it supports immune function by aiding in the production of antibodies.


Lysine is commonly found in high-protein foods such as meat, fish, dairy products, eggs, soy products, and legumes. It is also available as a dietary supplement, often recommended to help prevent or treat herpes simplex infections due to its ability to block the activity of arginine, an amino acid that promotes the replication of the herpes virus.


For those following a vegetarian or vegan diet, paying attention to lysine intake is important because plant-based diets can be lower in lysine compared to diets containing animal products.

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