Acetyl L-Carnitine is essentially a processed form of L-Carnitine that can pass the blood-brain barrier to help energize the brain. Related to L-Carnitine (or just carnitine), the two are different forms of the same amino acid, but have different applications. L-Carnitine is needed to release energy to the muscles from fat, whereas Acetyl L-Carnitine is the preferred form of carnitine for brain and nerve support. Our Swanson Ultra Maximum-Strength Acetyl L-Carnitine Arginate formula features ArginoCarn® from Sigma-Tau for powerful cognitive nutrition. For the most economical form, try Swanson Premium Acetyl L-Carnitine, which delivers 500 mg per serving. Learn more about these two forms of l-carnitine from a product specialist.