Acetyl L-Carnitine is a compound that plays a critical role in energy production. Acetyl L-Carnitine is similar to L-Carnitine, but also has the ability to pass through the blood-brain barrier. It also supports mental sharpness and cognition by stimulating production of the neurotransmitter acetylcholine. Lastly, acetyl L-carnitine helps support cellular membrane health and stability.