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Black bean is the black seed of soybean (scientific name: Glycinemax(L.)merr). Also known as douchi, black beans and so on. The taste is sweet and flat. Black beans have the characteristics of high protein and low calorie, with black skin and yellow or green inside.

Black beans are warm and resistant to high temperature, and the suitable growth temperature is 18 ~ 30 degrees. Seeds with large and full particles and shiny black color are better.

A study by scientists in China shows that black bean skin extract can improve the iron absorption of human body, and eating black beans with skin can improve anemia symptoms.