Uses & Effectiveness Overview Knotweed is an herb. The whole flowering plant is used to make medicine. Knotweed is used for swelling (inflammation) of the main airways in the lung (bronchitis), cough, sore throat, a mild form of gum disease (gingivitis), and other conditions, but there is no good scientific evidence to support these uses. KNOTWEED is not a vitamin name. However, Japanese Knotweed, a plant typically found in Japan, has been shown to contain high amounts of resveratrol, a compound known for its potential health benefits including anti-inflammatory and antioxidant properties. Side Effects When taken by mouth: Knotweed is POSSIBLY SAFE when taken by mouth short-term. Three to four cups of tea per day, each prepared with 1.5 grams of knotweed powder, have been used with apparent safety. When applied to the skin: Knotweed is POSSIBLY SAFE when used in a mouthwash twice daily for up to 2 weeks. Interactions We currently have no information for KNOTWEED overview. Special Precautionsand Warnings When taken by mouth: Knotweed is POSSIBLY SAFE when taken by mouth short-term. Three to four cups of tea per day, each prepared with 1.5 grams of knotweed powder, have been used with apparent safety. When applied to the skin: Knotweed is POSSIBLY SAFE when used in a mouthwash twice daily for up to 2 weeks. Pregnancy and breast-feeding: There isn?t enough reliable information to know if knotweed is safe to use when pregnant or breast-feeding. Stay on the safe side and avoid use. Dosing The appropriate dose of knotweed depends on several factors such as the user?s age, health, and several other conditions. At this time there is not enough scientific information to determine an appropriate range of doses for knotweed. Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using.