I often hear doctors say that the expensive vitamins at places like GNC are just a waste of money? Yet, when I compare the differences between let's say UltraMega and Centrum it's like night and day. I am a little confused. I know sometimes more isn't better but some of the common vitamins like Centrum and others alike don't hardly have anything in them!

So, what do you use and WHY? Why did you choose your brand and what research did you do on how much of each vitamin you should consume? For instance, too much Iron or vitamin A isn't good, right? You can cause more harm than good I heard.

So what do we do???

Thanks!

p.s. Is there a website link on what the normal human being should consume daily in each of the vitamins and minerals? I am interested in learning how much is too much and how it effects men and women.