L Carnitine for Fat Loss: Why Most Supplements Fail (and What Actually PEScience Supplements don't replace the workbut they can support it L Carnitine helps your body turn fat into usable energy, so you can push harder and recover better. Consistency first. Supplements second. Results Potential effects of l Carnitine supplementation on different Download Scientific Diagram L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. How to Take L Carnitine Correctly to Boost Your Training Bodybuilding.com