Monster View Acetyl L-Carnitine is a great supplement for focus & may help with other functions. We ve all used it here at Monster & we love the benefits it brings. Overall 5 Stars. Product Highlights Acetyl L-Carnitine is similar in form to the amino acid L-Carnitine & has some similar functions. It may boost the immune system, energy levels, stamina & production of ATP (adenosine triphosphate). It may also increase brain function alertness, elevated mood & focus as well as maintaining testosterone levels post workout. Who should use Acetyl L-Carnitine* Athletes looking for increased focus & performance.* Those wanting an easy way to take Acetyl L-Carnitine.