Lysine Benefits, Food Sources, and Supplement Guide Can L Lysine Support Immune Health and Viral Suppression in Long COVID and ME CFS? RTHM Lysine: Sources, Metabolism, Physiological Importance, and Use as a Supplement Acetyl L Carnitine 100 500mg Capsules Ingredient Spotlight: L Carnitine Source: Biosynthesised in the body from the amino acids Lysine and Methionine, L Carnitine is a conditionally essential nutrient involved in energy metabolism and fat transport. Key Benefits