Can L Carnitine Improve Fat Loss? Uncle Gym's Advice When to Take L Carnitine for Weight Loss & Maximize Results L Carnitine doesn't magically burn fat, it helps your body use fat as energy. Combine it with training and consistency, and you'll feel the difference @Marybosch shows us how L Carnitine will boost your L Carnitine 3000 liquid is designed to boost fat metabolism, enhance energy production, and improve exercise performance by transporting fatty acids into cells to be burned for fuel, take 30 60 minutes before training.