L-lysine is an essential amino acid with two primary supplemental uses: (1) herpes simplex virus (HSV) outbreak prevention (the most popular use), and (2) calcium absorption enhancement. The HSV mechanism is elegant: lysine competes with arginine for absorption and cellular entry, and HSV requires arginine for replication. By shifting the lysine:arginine ratio, viral replication is suppressed. A meta-analysis found 1g+/day reduced HSV recurrence rate by 25-50%. Our research also shows lysine is essential for collagen synthesis (lysyl oxidase cross-links collagen), making it relevant for wound healing and connective tissue.
For HSV: the virus requires arginine for capsid protein synthesis and DNA replication. Lysine and arginine compete for the same intestinal transporter (CAT-1) and cellular entry mechanisms. High lysine intake (1) reduces arginine absorption, (2) reduces arginine entry into cells, (3) increases arginase activity (breaking down intracellular arginine). The net effect: reduced intracellular arginine starves the virus of a replication requirement. For collagen: lysine residues in procollagen are hydroxylated by lysyl hydroxylase (vitamin C-dependent) and then oxidatively cross-linked by lysyl oxidase (copper-dependent), forming the structural cross-links that give collagen tensile strength.
No critical interactions identified.
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.