Also known as: Lysine, L-Lysine HCl, Lysine Monohydrochloride
Essential amino acid important for protein synthesis, collagen formation, calcium absorption, and immune function, particularly noted for antiviral properties.
Safe for long-term use
Those prone to cold sores
We haven’t curated landmark studies for L-Lysineyet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Good evidence for cold sore prevention, protein synthesis
Consult healthcare provider
Caution with kidney disease at high doses
Other ingredients in the Amino Acid category.
Formulate Research Team. (2026, August). L-Lysine — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/l-lysine-supplement
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.