Scientific Benefits of Acetyl L Carnitine (ALCAR) Stop training harder. Start training smarter. If you're hitting the gym but feel like you're hitting a wall, you might be missing one key ingredient: L Carnitine. Think of L Carnitine as the " What Is L Carnitine? How Does It Work? L Carnitine 2000 mg 120 Capsules Acetyl L Carnitine aSquared Brands WHAT IS L'CARNITINE? L'Carnitine is like a taxi for fat molecules, helping them get into cells to produce energy. It's found naturally in meat and dairy and can help with burning fat,