Acetyl L-Carnitine is similar in form to the amino acid L-Carnitine and has some similar functions, being involved in the metabolism of food into energy. It may boost the immune system, energy levels, stamina and production of ATP (adenosine triphosphate). It may also increase brain function alertness, elevated mood and focus as well as maintaining testosterone levels post workout.

However, Acetyl L-Carnitine is absorbed into the bloodstream more efficiently than L-Carnitine and more importantly, Acetyl L-Carnitine passes more effectively through cell membranes and is utilised more efficiently in the mitochondria of the cell.