There are no definite studies that show that Amaranthus can treat gray hair. Amaranthus is a common Chinese medicine, cold and sour in nature, with the effect of clearing heat and fire, cooling blood, stopping bleeding, stopping diarrhea and anti-inflammation, etc. It is generally used to treat heat and blood dysentery, carbuncle and swelling, eczema, damp-heat diarrhea and dysentery. So, from the efficacy of Amaranthus, there is no exact treatment for gray hair. However, amaranth has the effect of cooling the blood and stopping bleeding, which is an auxiliary treatment for white hair caused by blood heat delusion. From a western medical point of view, the copper contained in amaranth can help promote the formation of melanin in skin cells and regulate the hair follicles and endocrine secretion in the head, which can alleviate the problem of gray hair to some extent. However, the use of amaranth should be done under the guidance of a doctor in order to avoid adverse conditions such as diarrhea. In addition, there are many reasons for white hair, so you should seek medical attention to clarify the specific reasons and treat them under the guidance of a doctor, such as kidney essence deficiency, you can use drugs such as Phellodendron, Liu Wei Di Huang Wan, Jin Gui Kidney Qi Wan, etc., and regulate their own work and rest, to develop good habits, which can help improve their situation.