L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe Injectable L Carnitine: What It Is, How It Works, and Who Should Use It Mesotherapy Cocktails, Exosomes Regenerative Skin Boosters L Carnitine Force Factor L Carnitine Benefits for Fat Burning and How to Use ICONFIT L Carnitine is an amino acid that plays a role in energy production, by helping transport fatty acids into the mitochondria. Mitochondria are tiny powerhouses within cells that make energy.