Mmm... good question. You know both of those things fall under biology right? You could get a B.S. in biology, or study biology and pre-medicine and take what you learn from it and further it by doing a masters or getting a phd in specified medicine, and take a naturopathic approach. Maybe even toxology and ecology...
I'm not familar with specifically what can be included in the branch of naturopathy, but IF it does not teach you the basic fundamentals of how the human body works, on a chemical, physiological, and biological level, then knowledge of remedy is going to be a matter of what appears to work, and it will be much harder to help people when you don't have any idea why one thing works for one person and is harmful to the next.
There are plenty of natural remedies that actually do have good reason to affect the body in a positive way, but if you have no idea why, then you can't be sure you are doing the best you can do for people... in which case you could actually do some harm, because there is no way of knowing, unless you apply scientific (observable repeatable quantifiable) methods to it.
I study biology, and I can still understand how rubbing a stone and believing it has special powers can self-induce chemical changes in the brain, and therefore have healing effects on the body.. I'm not saying that's what you are talking about, but either way I suggest you start with the broader basics.