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 Supplement of the week: L Carnitine! This one doesn't just boost fat metabolismit can also improve recovery, endurance, and even brain function. If you're serious about performance and longevity, this might be Amazon.com: Swanson Propionyl L Carnitine with Glycine Natural Supplement Promoting Heart Health & Energy Support May Support Muscle Strength & Endurance (60 Veggie Capsules) : Health & Household