L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage 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 Serum L Carnitine Levels Are Associated With First Stroke in Chinese Adults With Hypertension Stroke Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis