It is wrong to say that the keel in Chinese medicine is the bone of a dinosaur. In fact, keel is a skeleton fossil of ancient mammals, such as elephants, rhinoceroses, three-toed horses, cattle and deer. It is mainly composed of apatite, calcite and a small amount of clay minerals.

sternum/breastbone of a bird

Keels are mostly produced in Inner Mongolia, Gansu, Hebei, Hubei, Shanxi, Shaanxi, Henan, Sichuan and other places.

As a traditional Chinese medicine, keel can be used to treat palpitation, epilepsy, dizziness, spontaneous sweating, night sweats, insomnia, amnesia, nocturnal emission, metrorrhagia, chronic diarrhea, chronic ulcer, and wet sore.