Acetyl-L-Carnitine (ALCAR) is an amino acid naturally produced by the body that plays a role in energy metabolism. When incorporated into a balanced diet and active lifestyle. Made from vegetable capsules and 100% pure ALCAR, Emrald Labs L-Carnitine Capsules are a great general health supplement to add to your daily stack. Always consult a doctor before use and follow the directions on the back of the bottle.