L-Carnitine is an amino acid that occurs naturally in the body and plays an important role in fat metabolism. Weider L-Carnitine is a lemon-flavored ampoule supplement used to boost energy, improve athletic performance, and support fat burning. It helps transport fatty acids into cells to be used as an energy source, which can be beneficial for people looking to lose weight or improve their body composition. Ingredients Water, L-carnitine tartrate, acid: lactic acid; choline bitartrate, flavor (lemon flavor), preservative: potassium sorbate; sweeteners: sodium cyclamate, acesulfame K, sucralose, sodium saccharin; emulsifier: E471.