Do check out the cleansing, nutritional and adaptogenic properties of chaga. I have a strong feeling about that)
Sounds like you'd have to buy it though...What kinds of 'medicines'(herbs, mushrooms etc.) grow near you? I totally believe we will find what would most (and easily) serve our health, close to where we live. wewere not meant to have to buy everything and be so removed from the earth and what it would do for us, given a chance.
...When I craved a certain level of tonic cleansing, I discovered (later) burdock was right at hand, and I kept stopping the gardeners form tearing it out. I instinctively liked and wanted to protect it.