I 100% agree. There are several issues:Many compounds we see in pharmaceuticals are research derived from natural compounds, and/or molecular structure modified to be more potent.
1) Unregulated industry means they can put anything in these supplements within reason. Varying quality, quantity and bulkers.
2) It is very difficult to isolate natural molecules and format them so they don't degrade and become completely inactive.
3) They are less selective and potent in general.
4) They often do not survive the digestion process and get into the bloodstream.
5) There are often conflicts of interest and questionable ethics in the country of origin.