Japanese Knotweed is a perennial plant native to Japan, China and Korea. The scientific name for Japanese Knotweed is “polygonum cuspidatum” and it is considered to be a weed.
It is also called fleeceflower, Himalayan fleece vine, monkeyweed, Huzhang, Hancock’s curse, elephant ears, pea shooters, donkey rhubarb, sally rhubarb, Japanese bamboo, American bamboo, and Mexican bamboo.
Japanese Knotweed is a popular commercial source of resveratrol for the nutritional supplements industry. Both Japanese knotweed and giant knotweed are concentrated sources of resveratrol. Many nutritional supplement manufacturers use Japanese knotweed as the source for the resveratrol in its supplements and typically use its scientific name, polygonum cuspidatum, on the ingredients label.
Japanese knotweed is also a concentrated source of “emodin.” The roots of Japanese knotweed are used in traditional Chinese and Japanese herbal medicines as a natural laxative. The ingredient responsible for the laxative effect is emodin. Emodin has a mild laxative effect in doses of 20 to 50 mg per day.
Grapes, Red Wine and more…
Food sources of resveratrol include grapes, wine, peanuts, soy and some other food sources.
Grapes and peanuts contain mainly ‘trans-resveratrol’, while red wines contain ‘cis-resveratrol’ and ‘trans-resveratrol’.