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 L Carnitine Linus Pauling Institute Oregon State University Should I Take Acetyl L Carnitine or L Carnitine HealthAid Effect of L carnitine on hepatic lipid accumulation and liver function Download Scientific Diagram Jarrow Formulas Energy L Carnitine Tartrate 500 mg 100 Capsules Vitacost L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy.