What do people think is the optimum daily(or weekly) dosage for
A) Astragalus herb powder
B) Astragalus Extract (stronger)
If so what's the reasoning? Let's just assume a person of average weight etc.
By optimum I mean a dosage that has the maximum anti-aging effect while still being safe (not factoring in $ costs or personal convenience or anything like that).
Is there any generally accepted maximum safe dose for this?