When I began looking for help from Herbals, I ran into a source with very well planned and executed studies on uses of herbals. Their math was solid, and their results are predictive of the real world, treating serious conditions!
Commission E out of Germany is a great place to look for hard science on Herbals:
https://www.salisbury.edu/nursing/herbalremedies/German%20Comm.htm
They have had socialized medicine so long they needed a fall back from regular meds, because they could not afford even the generics anymore.
:(