What are some essential vitamins and minerals i should take to help me with energy and mental alertness? i'm studying for some industry related courses for work, and after the long day at the office and then workout, make dinner, etc. i feel drained a lot and not always able to focus 100% on my studies. I currently take the following on a daily basis: 1 multi vitamin 1 vitamin E 1 vitamin C 1 chromium should i add, fish oil, flax, etc.?