anon's herbals have SOME clinical evidence generally : https://pmc.ncbi.nlm.nih.gov/articles/PMC2956313/
It's important to demarcate flavors of medicine at play here:
- MD "allopathic medicine" this is what we all consider normal medicine. They have hardcore requirements for clinical evidence.
- ND "naturopathic medicine" is a fully government licensed form of medicine (in certain places such as pacific northwest). They generally have less hardcore requirements for evidence, but do use evidence nonetheless, sometimes pre-clinical. All this recent interest in "senolytics"... a lot of what exists such as quercetin or fisetin, those are herbals, the ND's domain. And these have preclinical evidence against cancer. SOME are pretty cool and scientific people, of course, some are crazy hippie dippies what with the mushrooms and the healing crystals
- leeches "humoral medicine". This is an ancient and non-empirical form of medicine based on primarily the works of Roman physician Galen but bears similarities to medicines in other nations like China - "hot" and "cold" disease states vs hot & cold food, four humors, one of which is blood. If the disease is "too much humoral blood" the treatment is then the leech to lower that blood. This is very much distinct from the ND (at least I hope)