L Carnitine Powder (Carnipure) Amazon.com: Nutricost L Carnitine Tartrate Powder (250 Grams) 1 Gram per Serving, 250 Servings : Health & Household L Carnitine 5000 L Carnitine 3000 MG LIV Vitamins Most people talk about carnitine like it is one supplement. It is not. Acetyl L carnitine and L carnitine L tartrate do different jobs, and picking the wrong one for the wrong goal is where people 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