According to the data of China Health Network, the full name of Russian black fruit is "Sorbus nigra", also known as "velvet black fruit". This fruit is a small berry of Ardisia in Rosaceae. When it matures, its skin is dark purple, about the size of a blueberry. It looks a bit like blueberries in the distance, but it tastes completely different from blueberries. It tastes bitter raw.

This kind of fruit is rich in arabinan, amino acids, phenolic active substances, mucus and other components, with high medicinal value and remarkable therapeutic effect on diabetes. It has the functions of lowering blood sugar and repairing islets, and is a good health food.