Fnord wrote:
The level of the alleged "therapeutic agents" can vary from season to season, and even in adjacent plants from the same row in the same harvest. This is why they are extracted -- to produce consistent levels of those agents in every dose.
Take two aspirin or drink 4 to 6 cups of black willow-bark tea?
You decide.[/color]
OK, that's a good point.
As you said, plants in whole form have natural variation in potency so the dosing may be less exact.
There are pros and cons to both approaches, though.
For instance, whole plants may contain additional benefits that are lost when we adopt a reductionist mindset of extracting a single therapeutic substance, for instance there may be other substances within the plant that reduce side-effects and so on.
A similar shift is happening with the understanding of nutrition, as now it is recommended to obtain vitamins from a varied diet rather than rely on supplements, which used to be considered equivalent but studies have since shown are often inferior or completely ineffective.
I'm not saying I think we should all switch over from western medicine to TCM, just that I think both approaches have value and can learn much from each other.