Bests & Worsts Reviews from Amazon

This Hup A is derived from synthetic origin - not Chinese club moss. Chinese club moss is 100% (-) isomer which is active whereas this form is a racemic 50/50 mix of (-) and (+) isomers. The (+) isomer is inactive meaning only ~50% of this product is active. Thus, 200 mcg is actually ~100 mcg of active Hup A. The label should reflect the amount of active Hup A - not the (+) form which is very deceptive. Also, their Certificate of Analysis is based on total input by batch record not actual analysis. I’d recommend Source Naturals for the price per actual active Hup A. Source Naturals uses 100% Chinese club moss which is purely the active (-) isomer.