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Hi Robert, I don't know the Hi Robert, I don't know the % that dried garlic needs to be, but it does need to be quite dry. The first year that I made this, I only dried it for a few days. It looked good and powdered nicely, but, as it was not completely dry, it stuck together in the jar after a while. This longer-dried stuff sometimes gets sticky the following summer as it is quite humid where I live. I don't really know what to say about the medicinal part. I have recently read that the medicine only begins making when the garlic is crushed. Folks recommend letting the garlic rest for about ten minutes before adding it to a dish so that the medicine can happen. Of course, this has to do with fresh garlic.