Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health 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 Windmill L Carnitine 250 mg 50 Capsules : Target L Carnitine Vitamin Supplement for Energy and Metabolism Boost