L carnitine, creatine and whey protein effective for strength training Life Extension, Creatine & Acetyl L Carnitine, Energy Plus Life Extension, Creatine & Acetyl L Carnitine, Energy Plus L Carnitine 3000, Berry Blast, 15.72 fl oz (465 ml) 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 L Carnitine is Underrated. New Meta Review Reminds Us Why.