Carnitine vs Acetyl Carnitine: What Quality Differences Do They Have? Difference between L Carnitine and L Carnitine L Tartrate 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 Role of Dietary Supplements in Thyroid Diseases Bentham Science L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe