Polygonum multiflorum Thunb is the root tuber of Polygonum multiflorum Thunb, which is mainly produced in Henan, Hubei, Guangxi and other places. Digging in autumn and winter, cutting into thick slices, and drying, called raw Polygonum multiflorum Thunb. Then mix well with black bean juice, steam until the inside and outside are brown, dry in the sun, and weigh the processed Polygonum multiflorum Thunb. Raw fleece-flower root tastes bitter, astringent, flat in nature, heart-warming, liver and large intestine meridian. Has the functions of moistening intestine, detoxicating, stopping oxygen and stopping malaria; It is suitable for intestinal dryness, constipation, carbuncle and scrofula. Radix Polygoni Multiflori Preparata is bitter, sweet, astringent, warm in nature, and belongs to liver, kidney and heart meridian. It has the effects of nourishing liver and kidney, nourishing essence and blood, strengthening bones and muscles, and blackening hair. It is mainly used for liver. Deficiency of kidney essence and blood, dizziness, premature graying, soreness of waist and knees and nocturnal emission.

Modern pharmacological research shows that Polygonum multiflorum Thunb contains anthraquinone derivatives, mainly chrysophanol and emodin, followed by rhein, emodin-6 monomethyl ether and chrysophanol quinone. In addition, it also contains starch, crude fat, lecithin and so on. It has the effects of strengthening brain, improving intelligence, reducing blood fat, preventing and alleviating atherosclerosis, enhancing immune function, strengthening heart, protecting liver and resisting aging, especially its remarkable anti-aging and anti-atherosclerosis effects have attracted great interest and attention.