Black and white are relative, its expression degree depends on the number of melanin inside the cell, concerned with genetic factor, affected by the element such as living environment. In addition, many foods, including mulberry, may more or less have cosmetic effect due to their different nutritional components, but it is not recommended to place all the hope on one food.

Blueberry contains a large number of physiological active substances, known as the "no.1 antioxidant" in fruits and vegetables, can protect cells, avoid the destruction of oxide, it has the function of preventing dysfunction, improving short-term memory, improving balance and coordination of the elderly.