Hello Doctor.I m pursuing a my graduation, in law, and my college life demands late night work. Thus, daytime sleepiness is common and gets in the way of overall productivity. Night time sleep is often not very sound. Plus, irregular meals us a common problem. It also creates stressful conditions. I wish to know if energy supplements help one remain highly active through the day. I ve heard of Zevit, Nutrilite and Revital as good options. I wish to know which of them would suit my requirements (day time productivity), lifestyle (college, boarding, and a history of bronchital infection) and age (20).