Just speculating but based on what I've read herbs can have varying levels of the different compounds in it. It could be grown in a different place, it could be processed differently, some extracts might be standardised for a specific compound. I read an interesting thing about ashwagandha. Apparently KSM-66 brand was suing Sensoril because they thought Sensoril was copying their herbal composition. This sounded incredible to me. Same herb but apparently KSM thinks Sensoril's composition is too much like theirs upon advanced chemical analysis. Same herb!
I guess what I'm saying is that Now Foods product might be "excellent quality" but maybe it just doesn't have some specific compound in sufficient amounts in it. Anyone know what the active kidney protectant in astragalus might be? Astragaloside IV?
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