Are There Any Negatives to L-lysine?
                                
                                
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                                    4 min read                                
                            
                                Lysine is an essential amino acid, meaning the body cannot produce it on its own and it must be obtained through diet or supplementation. While widely used for its purported benefits, particularly for managing cold sores, it is crucial to understand if there are any negatives to L-lysine, especially with high or prolonged use.