What is L-Lysine HCI good for?
                                
                                
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                                    4 min read                                
                            
                                Lysine is one of nine essential amino acids that the body cannot produce on its own and must obtain from diet or supplementation. L-Lysine HCI is a common supplemental form of this critical nutrient, used for a variety of health purposes, from boosting the immune system to aiding in calcium absorption.