Be aware, this alternative medicine, as you call it, is becomeing part of real medicine. It is happening all over the world. The way you can tell that is to see the trials and studies that are being done and what they prove, You can do this by using the internet and google works well.
In google enter "curcumin cancer" or "vitamin C cancer" or "immune system cancer" or anything you might wonder about. Even well informed doctors can't possibly know about all the research going on in every different direction all over the world. Only some of this research shows useful results. So I think the internet is most useful in providing leading edge data. You may have to make your own decisions as to what is good information. Only trust reliable sources.
Hope this is helpful.