Comprehensive review of the expanding roles of the carnitine pool in metabolic physiology: beyond fatty acid oxidation Journal of Translational Medicine Springer Nature Link Taking a preworkout AND carnitine? It is important to get the timing of each supplement right to get the best results with both. Watch as Phil explains the best way to combine them. , #preworkout Pre Workout+BCAA+L Carnitine iGenetics Nutrition L Carnitine is Underrated. New Meta Review Reminds Us Why.