The Firebird
Commoner
Sometimes the state of knowledge is pretty good and they just aren't packaged as drugs for scientific or economic (can't patent natural products) reasons.I feel very mixed on this - there’s certainly real, usable drugs present in some natural remedies, but a lot of it is a bunch of bull. I do think it should be investigated in detail, so we can verify which category to put things in.
You can find willow bark, for example, marketed as a pain reliever. It most probably works--it has salicin. Pure salicin passed the trials of the time and was prescribed as a pain reliever in the late 1800s. But by 1899, aspirin had been prepared for market and worked better.
The same thing happens with a lot of treatments. The original insulin people used (the patent famously sold for $1) was purified from pigs (and other animals). They needed thousands of dead pigs to extract it from.
The insulin people buy now has been modified in dozens of ways to last longer and to regulate blood sugar more effectively. Its the difference between the wild banana and what you buy at the store.
That said such changes are patentable, and so there is a strong incentive to make some changes to maintain a patent even if they scientific justification is weak.