Hello Mike, I've taken vitamin B,E, calcium, but never felt any difference in my energy or memory...
Everyone has a different experience with the vitamins..

Some vitamins don't sit well with me they have a laxative effect. I have taken mens one a day

http://www.oneaday.com/mens.html

without any laxative symptoms. I spoke to a doctor about vitamins and she said sometimes you have to try different ones until you find the one thats right for you. One that fits your particular symptom.

In all actuality if you eat a well balanced diet you are getting all the nutrients you need.