Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health Carnitine: the claims and why it may not work L Carnitine 3000 San Nutrition Neither L Carnitine nor Berberine work like caffeine, yohimbine, or fat burners. They do NOT: Spike your heart rate Jack up your nervous system Cause jitters or crashes Mask L Carnitine doesnt magically burn fat, it helps your body use fat as energy. Combine it with training and consistency, and youll feel the difference @Marybosch shows us how L Carnitine will boost