I'd started taking a multivitamin targeted toward women from Centrum shortly before my pregnancy, but switched out to prenatals as soon as I found out I was expecting. Although I had a miscarriage in January I still continue taking the prenatals at the insistence of my doctor, as I'd like to try getting pregnant again.
I think I chose Centrum because of the price and went with the women's formula because I'm concerned with my breast health since there's a history of cancer in my family.
I seem to do best with my overall health when taking supplements. I think part of it just might be a placebo effect in my case; taking them becomes a big part of my overall routine of being more health-conscious.
"Look self, I'm taking vitamins, so I should have a healthy breakfast and go for a walk! And I should have a healthy lunch/dinner and avoid any fast food joints! And I should go to bed at a reasonable hour . . ." You get the idea.
I'm sure there are many other health benefits aside from having it jump-start my day, for example I'm especially concerned with the possibility of having a vitamin D deficiency and hope that taking supplements will help increase my energy level.