(per tablet) Japanese Knotweed (Polygonum Cuspidatum) 1050mg (from 10.5mg of 100:1 extract, providing Resveratrol 95% - 1000mg). Japanese Knotweed (Polygonum Cuspidatum) is an excellent source of resveratrol, and in many parts of the world, people harvest the plant specifically for resveratrol extraction.
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