L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe Impaired brain function improved by l carnitine in patients with cirrhosis: evaluation using near infrared spectroscopy Scientific Reports The Science of Carnitine: How It Works and Why It Matters 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