Swanson Premium Acetyl L-Carnitine helps maintain healthy neurological function by delivering antioxidant protection throughout the entire nervous system. This unique ester of the amino acid L-carnitine also 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. Each veggie capsule delivers 500 mg of acetyl L-carnitine.