When to take L carnitine: Dosage, forms, and side effects Carnitine, Creatine, D3 Plus 500mg 60 caps (BioTonics) X Treme Stores EU LCarnitine Liquid 3000 mg Fast Absorbing Energy Support Muscleology Muscleology Sports Nutrition Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get Acetyl L Carnitine 500 mg