I have a good story about that! A brilliant scientist named Tu Youyou went through TWO THOUSAND Chinese medical herbs purported to treat malaria. She found one, now known as artemisinin, earning her a Nobel Prize and saving millions of lives. This is a fantastic true story, but look at it another way: out of two thousand supposed cures, only one was provable, a 0.05 percent success rate. It is extremely unlikely that a herbal cure will be effective.

Here’s the Wikipedia article