BTW, that's kind of the entire point of a site like HN. Experts from different fields (and hobbyists and laypersons) get together and exchange knowledge. Sorry to go on about this, but I've been seeing too many responses saying to go Google things.
I know nothing about the topic, but literally just Googled Drugs from the Amazon [1], and the very first example of the very first search result I came across was Quinine. [2]
[1] https://www.google.com/search?source=hp&q=drugs+from+the+ama...
[2] https://www.adventure-life.com/amazon/articles/medicinal-tre...
No need to wag your finger.
And it doesn’t seem that it will get higher. My impression of modern pharmaceutical research is that instead of focusing on natural medicinal compounds, it is more focused on discovering the exact mechanisms behind various disease processes and synthesizing molecules that either slow down or speed up key pathways along those processes.
but thats also how you end up on a geocities site about anti vaxxing because big pharma doesn't want you to know about the amazon and yell "exactly, I knew it all along!"