Dyeing your hair with chemicals is harmful to your health, so many people give up on various hair dyes, however, the gray hair that keeps growing out of your head makes people very annoyed. For the sake of health and beauty, we might as well learn from the ancients who dyed their hair with black soybeans. As early as the Sui and Tang dynasties, there is a natural way to dye hair. The Sui Yang Emperor’s harem all the incense medicine formula recorded a hair dyeing remedy – soybean decoction, the composition of the formula is very simple, is black soybeans and vinegar pulp. Black soybeans are soaked in vinegar for 24 to 48 hours, heated and boiled together, the dregs are filtered out, and then slowly simmered over low heat to make a thick paste. This is a natural hair dye cream, when you use it, wash your hair, dry your hair and put the cream on it, once a day. According to this book, black soybeans are sweet and flat, which can nourish the kidneys and strengthen the spleen, and is a good medicine for black hair; vinegar paste is rice vinegar with black soybeans, which can dye white hair, and was a popular hair dye and beauty agent during the Sui and Tang dynasties. The black color is into the kidney, black soybean sweet warm, non-toxic, into the kidney, spleen, heart meridian, has the role of tonifying the kidney and strengthening the body, removing dampness and water, anti-aging and prolonging life. The “Secret Record of Extension” contains: “eat black beans, people long skin, benefit color, fill the essence, plus strength, deficiency can eat.” It can be seen that black beans do have the effect of hair. However, the effect of soybean decoction may be slightly worse compared to chemical hair dyes, but it is definitely healthy and harmless. In addition, the soybean decoction is suitable for all kinds of non-genetic gray hair, but the scalp has a skin disease avoid using. In addition, the reporter also learned that in folklore, there are many black beans hair treatment prescriptions, such as fried black beans 20, black sesame seeds a spoon every night, there is a hair effect. Treatment of hair loss can be taken boiled black beans, each serving 50 grams, twice a day. Even with 1 month no improvement, can be changed to eat salt boiled black beans (every 500 grams of black beans with 5 grams of salt). Black beans 250 grams, 30 white fruit, crushed and fried, 100 grams of black sesame, 150 grams of He Shou Wu fried, the four flavors mixed into the bottle, 30 grams can also be taken after breakfast every day. Since most of the early gray hair is due to kidney deficiency and blood deficiency, black beans can not only be applied externally, but also taken internally. Dr. Cheng recommended that we can use black beans, black sesame, jujube, shouwu, rehmannia, angelica, etc., and grind them together to nourish the qi and blood, benefit the liver and kidneys, and strengthen the muscles and bones, which can make people live a long and healthy life and turn gray hair black and energetic.