that is a good question : some people may need more than others just to function , as for myself I am slowly lowering the ones that I am on now as my health improves ,total I take 7 suppliments daily , down from 12 in the begining ,eventually I will only need 5 , that is my goal .

the trick is to find the ones that you feel are really helping you and slowly remove the ones that are questionable till you are at bare minimum

a good multi vitamin will contain most of the vitamins and minerals that most people need , it's good to consoidate many suppliments into just one and makes a big difference on the wallet too.