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The effect of (L-)carnitine on weight loss in adults: a systematic review and meta-analysis of randomized controlled trials

The most commonly used is L-Carnitine, the form naturally produced in your body and found in many foods and supplements

However, research results are not entirely consistent regarding whether carnitine supplementation actually improves exercise performance

doi: 10.1016/j.juro.2009.02.121 37 NadjarzadehASadeghiMRAmirjannatiNVafaMRMotevalianSAGohariMRet al

This finding went against the prevailing assumption that you should use carnitine in a fasted state and away from meals to promote fat burning