i wonder how astragalus works...
did you feel any changes in pains or aches (inflammation) following training?
let's say your creatinine levels are 1,6 (healthy kidneys) before taking it and after 1 week of taking astragalus they're 1,3
by itself this is a drastic change, imo one that cannot be the result of an improved kidney function
a high creatinine level in healthy kidneys isn't bad, provided BP is normal
i would think astragalus acts at the source of creatinine (and similars) production (decreasing it, perhaps with its anti-inflammatory actions) rather than improving filtration in an already healthy kidney
too much filtration is actually bad as well
it would be different if the kidneys are unhealthy, then probably it could have an anti inflammatory effect locally..
i'm guessing you could find out through a nephrologist, provided you establish a full base analysis before the astragalus experiment and completing one after a another given period using the supplement
but who cares anyways

if it works, it works
i'll remember astragalus from now on