Though Japanese Knotweed is an invasive plant found in most countries, it has not reached my locality yet. So foraging is not an option for me right now. I could not find Japanese Knotweed in its pure form in local and online health stores. It seems to be mixed in with other herbs or extracted for the Resveratrol component only. Interestingly there are some good quality sources for purchase on Etsy
Below is the recipe I am currently using for my home made tincture. Since I have been using it, I notice my sleep is more solid and undisturbed. Body pains, tensions and stresses are greatly reduced.
Japanese Knotweed Root Tincture
Alcohol Extract
2t Japanese Knotweed Root Powder
1/8c 100% Pure Organic Grape Alcohol
Seal in sterile glass jar. Shake once a day for 2 weeks. Store in dark place at room temperature.
Decoction
1/2c Japanese Knotweed Root Powder
8c Water
Simmer 12 hours. Cool downto 80 degC
Mix 1/8c trained Extract with 1-7/8c strained Decoction. Store in brown or blue sterile bottles