A different version of the same amino acid as L-carnitine, acetyl L-carnitine is commonly utilized to support brain health due to its ability to cross the blood-brain barrier. Hence, acetyl L-carnitine supplements are used to boost brain energy and focus, a healthy mood, memory health and more. Once it passes through the blood-brain barrier acetyl L-carnitine helps to promote synthesization of a primary neurotransmitter in the brain known as acetylcholine. Acetylcholine's primary role is to allow for communication between nerve cells. By boosting acetylcholine synthesization, acetyl L-carnitine plays an essential role in supporting memory health, focus and alertness, improved sleep and muscle contractions.