The mung bean is a leguminous plant, also known as the green small beans, in China has a history of more than 2,000 years, native to India, Burma and other regions. Mung beans have the effect of clearing heat, detoxifying and eliminating heatstroke. In the hot summer, people often boil mung bean soup or make mung bean smoothies to relieve heatstroke, and old people and children like them very much.

Careful observers will find a white line in the middle of each mung bean, which is actually the germ of the mung bean, a component of the embryo, usually located at the top of the embryonic axis, and will eventually grow into the stem and leaves of the plant, so the white vertical bar is not a harmful substance.