Polygonum cuspidatum P. E.
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KING HERBS has been in production of natural Trans-Resveratrol since 1998.
KING HERBS is proud to be one of the best and largest Trans-Resveratrol producer in China
All KING HERBS' 25%, 50%, 98%, 99% Trans-RESVERATROL are pure natural from Polygonum cuspidatum root, knotweed root.
KING HERBS especially introduce her LOW EMODIN Trans-Resveratrol 50%, emodin is controlled under 2%!
KING HERBS could offer test report from American Analytical Chemical Laboratories Corp. which assures you following specialities:
pure white color
low heavy metals
nearly zero cis-resveratrol, cis-resveratrol-3-O-glucoside, trans-resveratrol-3-O-glucoside.