Look at all the crystal peas recommended online. After reading them, you can whiten, blacken and lose weight.
Nothing magical, just some effects of Gu Wu miscellaneous grains powder. Almonds look white, black sesame seeds are black, oat grains are used as meal replacement, and tea is useful for weight loss. You can find out for yourself, not to say that there is nothing you can't believe. This is common sense of Chinese medicine.