Pig sand is commonly known as pig gallstones. The earliest recorded in "Tang Materia Medica" is known as wild boar yellow. It is a stone in the wild boar gallbladder of pig animals, which is spicy, sweet, flat and non-toxic.The appearance is pale yellow, or greyish-black, with a rough surface, with hairs growing two or three centimeters long.With the hand to touch it, the hair texture is hard.There is a fishy smell, with a knife to cut the hair, the interior is yellow, a little fragrant, with a little luster on the surface.By some mountainous areas known as pig treasure, also known as pig sand.

Pig sand research report pointed out that pig sand is a rare Chinese herbal medicine, its formation for a long time, and the pig feeding period is very short, so it is rarely found in the pig body, but there are also occasionally visible.Its medicinal effect is similar to cow yolk, mainly used for clearing away heat, detoxification, resolving phlegm, fixed alarm, has a sedative effect on the human body.Can treat the heartbeat, insomnia and other diseases.According to the investigation, the superior pig sand each unit of bilirubin reached at least 10%, has a high medicinal value