Not all vitamins and minerals are created equally. For example, take calcium: you do not eat pure calcium (pure calcium is a highly reactive, soft metal!). What you eat is calcium atom(s) along with other atoms to make a molecule. How your body deals with this molecule can vary vastly. This is why professionals will tell you to take calcium citrate as opposed to calcium carbonate, since the citrate form of calcium is much better absorbed .
Other examples are natural versus synthetic vitamin e, d-alpha-tocopherol (natural), and dl-alpha-tocopherol (synthetic); note the only difference in the name is the “l” after the “d”. The natural form absorbed and utilized much more effectively.
Please note, i’m just pulling these particular website references out in 30 seconds, since I already know that this type of research is out there and that there is a reasonable consensus about a great number of vitamin and mineral studies (also a lot of dissent, but that’s why research is a progressively refining activity). These websites just happened to be amongst the first few that were returned on google.
So, what I am saying is that it does indeed matter what the particular form of a desired vitamin or mineral is. The catch is that manufactures do not usually use what is best for you or most effective, but rather what costs them the least and still lets them put seemingly big numbers on the side panel. These numbers are a chemical analysis only, not a measure of whether your body will actually be able to use that amount that is supposedly being provided.
Do your research! Find the forms of the vitamins that are best utilized by your body, and do not just go by what the chemical analysis is on the side panel. The purity products perfect multi is a reasonable attempt at combining these together, but i’d like to see others as well. I think that they charge too much for their product.