Now Foods has a nice selction of vitamins and supplments by health need.
WebMD has information on health as well as a wonder search bar for information on any vitamin.
If you are looking for protiens &supplements as well beauty care Vitamin Shoppe has got it.
For a nice article on healthy eating and supplements check out the Mayo Clinic.
For all kinds of information on exercise and supplements have a look at Muscle and Fitness. I have been reading their articles since the early 1980's.