Supplement of the week: L Carnitine!, This one doesnt just boost fat metabolismit can also improve recovery, endurance, and even brain function. If youre serious about performance and longevity, Frontiers Discovery and validation of acetyl L carnitine in serum for diagnosis of major depressive disorder and remission status through metabolomic approach Acetyl l carnitine deficiency in patients with major depressive disorder PNAS A 35 year old man says he transformed his body in a few months by switching to full body workouts and smaller portion sizes with a protein goal.