No reliable evidence for herbal medicine?
The problem is that it's impossible to quantify because the herb’s chemical composition (qualitative and quantitative) varies with its
country of origin,
harvest time,
method of processing, the
part of the plant the sample is sourced from, and how long the
harvested plant was stored before use in manufacture.
It's not that we don't have evidence of results.
But because of the lack of standardisation, there will never be anywhere near the quality of clinical evidence for unrefined herbal medicines that’s required for prescription medicines.
If you can treat something with natural means, instead of that drug on the TV ad that has 47 side effects including death, go with the herbs.