Best way to have mutible pages/posts

Hi this question is for anyone (not just Flynn, he's a busy man after all!) I'm just getting ready to start adding content to a site I'm making. I'll have a page "vitamins" with pages under it for vitamin A, B,C, ect.
I'm wondering what would be the best way to set this up.
Have the main pages listed and when you click on them have the sub-pages listed there? Or use the drop down tabs, my concern being the number of sub-pages under "herbs" for instance, being maybe 100 or so. I.ve been at this for a while but sometimes I feel very noobish still!
Any and all suggestions are appreciated.