Levocarnitine, commonly known as L Carnitine, is a naturally occurring compound that the body produces from the amino acids lysine and methionine. It plays a critical role in energy production by transporting fatty Spring Valley L Lysine 500 mg 250 Count Can L Lysine Support Immune Health and Viral Suppression in Long COVID and ME CFS? RTHM Source Naturals L Proline L Lysine, 275 mg 120 Tablets Smith's Food and Drug EuRho Vital L Carnitin + L Arginin EuRho Vital