L Carnitine 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 energy supplements for working out L Carnitine 3B metabolism for weight loss LifeSource Vitamins L Carnitine Liquid Pharmaceutical Grade 16 oz. Citrus Flavor. Acetyl L Carnitine (ALCAR) 500 mg with Vitamins B5 and B6 The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link