I would suggest discussing this with a doctor as well. Some vitamins and minerals are toxic if too much is taken. Rather than doubling up on a multi-vitamin, you would be better off taking additional doses of just those vitamins and minerals in which you feel you are deficient. For example, I take Centrum's general multi-vitamin, but I also take additional vitamin C, folic acid (B-complex), vitamin E, and calcium with vitamin D - but before I added those I talked to my doctor about what would be beneficial, what would flush out of my system without effect, and what would be enough to cause negative side effects.I've just started taking a One-A-Day two times a day.