AMDE studies on performed extensively on pharmaceutical products. https://en.wikipedia.org/wiki/ADME For other substances like heavy metals and VOCs, there will be less data, but you should still be able to find some information.

When you Google, list the substance of interest and pharmacokinetics.

Another thing to Google is the substance of interest and MSDS. Section 3, 11 & 12 will give you all the important that you are looking for - hazards id, toxicology info and ecological info.