Polygonum multiflorum Thunb. is the dried root tuber of Polygonum multiflorum Thunb. of Polygonaceae, and its taste is bitter, sweet, astringent and slightly warm, and it enters the liver and kidney meridians. Radix Polygoni Multiflori Preparata can tonify liver and kidney, nourish essence and blood, strengthen bones and muscles, and also astringent essence and stop leukorrhagia. It is a nourishing medicine, and can be used for treating soreness of waist and knees, dizziness, premature gray hair, nocturnal emission, metrorrhagia and leukorrhagia due to deficiency of both liver and kidney and deficiency of essence and blood. Radix Polygoni Multiflori is weak in tonifying deficiency, and is good at detoxifying, intercepting malaria, moistening intestines and relaxing bowels, and treating sores and swelling, furuncle, persistent malaria, intestinal dryness and constipation.
"Compendium of Materia Medica" contains Shouwu "nourishing blood and benefiting liver, consolidating kidney, strengthening bones and muscles, and blackening hair, which is a nourishing medicine, not cold and not dry, and it is above Rehmannia glutinosa and Radix Asparagi." "Kaibao Materia Medica" said that it "stops heartache, benefits blood and gas, has dark moustache, likes color, grows bones and muscles for a long time, benefits the essence, and prolongs life". Pharmacological analysis shows that Polygonum multiflorum Thunb contains anthraquinones, mainly chrysophanol and emodin, followed by rhein (processed products do not contain rhein), emodin methyl ether and rhubarb anthrone, starch, crude fat, egg phosphorus and so on.
Chinese medicine believes that hair is blood. Adding Polygonum multiflorum Thunb to shampoo takes advantage of its function of benefiting essence and blood, so Polygonum multiflorum Thunb can blacken hair. But as far as the content of Polygonum multiflorum in shampoo is concerned, it is too small to play the role of blackening hair. Besides, everyone has different reasons for gray hair, and how can Polygonum multiflorum be used to treat all patients? Although non-toxic, it can't cure all diseases.
But the main question is whether the current Polygonum multiflorum shampoo really contains the ingredients of Polygonum multiflorum. Moreover, some unscrupulous merchants have added a lot of chemicals, which is harmful to the human body, and Polygonum multiflorum Thunb itself should be harmless.