Life Extension, Creatine & Acetyl L Carnitine, Energy Plus Life Extension, Creatine & Acetyl L Carnitine, Energy Plus 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 This combo is. L Carnitine helps your body use fat as fuel Creatine fuels strength, power, and performance A stronger, more efficient body! Educational purposes only. Not medical advice. Christine L carnitine, creatine and whey protein effective for strength training