Medical Mondays: Which Supplements Should I Be Taking?

I really want to do everything in my power to get healthy in the coming New Year. I've started working out here and there and I've also eliminated certain foods from my diet that were likely doing more harm than good. I used to take a women's multi-vitamin, but a girlfriend of mine recently told me that I should be careful when using supplements/vitamins, because many are not as effective or safe as the manufacturers claim. What are some supplements that you would recommend for a menopausal woman?