alias: lysine lysine is an essential amino acid found in protein-rich foods such as meat, fish, eggs, dairy, and legumes. it is crucial for protein synthesis, tissue repair, and the production of enzymes, hormones, and antibodies. chemical properties molecular weight: 146.19 g/mol density: 1.7 g/cm³ melting point: 224°C (decomposes) solubility: highly soluble in water; slightly soluble in alcohol chemical formula: C₆H₁₄N₂O₂ usefulness in medicine lysine supports collagen synthesis, making it essential for skin health, wound healing, and maintaining strong bones. it is used to treat and prevent cold sores caused by the herpes simplex virus by inhibiting viral replication. lysine plays a role in calcium absorption and retention, helping to prevent osteoporosis. it supports immune function by aiding in the production of antibodies. lysine may help manage anxiety and stress by modulating neurotransmitter levels. antibacterial and antimicrobial activity lysine itself does not have direct antimicrobial effects but supports immune responses and cellular repair, indirectly enhancing the body’s defense against infections. research highlights: bacteria: escherichia coli research link staphylococcus aureus research link research links lysine and collagen synthesis lysine and immune function