Dear Stephen,
Can you tell me how to extract resveratrol from knotweed root? I know about grinding the root into a finer material but how do I extract the resveratrol? Please let me know.


Stephen’s response:
If you want to make a tincture (it will extract a great deal more than only resveratrol by the way) use 70% alcohol and 30% water in a 1:5 ratio. That means that if you have 10 ounces of herb (the “1”) you will need 5x that of liquid (the “5”). In other words you will need 50 ounces of liquid. 70% of that should be grain alcohol (that is, 35 ounces) the rest (15 ounces) should be water. Sounds more complicated than it is once you get the hang of it.
Stephen
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