Acetyl L-Carnitine HCl 500 mg 120 Veg Caps - Swanson Acetyl L-Carnitine HCI plays a key role in energy production for optimal brain function. Muscles throughout your body need this energy as well to grow stronger as you exercise. Your brain uses this energy to maintain healthy functions like neurotransmitter production. Acetyl L-Carnitine HCI also helps maintain healthy neurological function by delivering antioxidant protection throughout the entire nervous system. Each capsule delivers 500 mg of Acetyl L-Carnitine HCI.