Keel is a skeleton fossil of ancient large mammals, mainly produced in Henan, Shandong, Gansu, Shanxi, Shaanxi and other places. Raw or calcined. The taste is sweet and astringent, and the nature is slightly cold. Return to heart meridian Has the effects of calming the liver, suppressing yang, calming the nerves, and astringing. It can be used for dysphoria and dizziness caused by yin deficiency and yang hyperactivity, and can be used with oyster and white peony root. It can be used for delirium, palpitation and insomnia and madness. It can be used with Cinnabar, Yuan Zhi and Ziziphus Spinosae. It can be used for treating asthenia, nocturnal emission, metrorrhagia, leukorrhagia, etc. Often used with oysters, Schisandra chinensis and other drugs to treat physical weakness; Concha Ostreae, Semen Euryales and other drugs are used together to treat leukorrhagia and menorrhagia. Oyster, cuttlebone and yam are used together to treat physical weakness.

Raw keel is mainly used to soothe the nerves, calm the liver and suppress yang, and is mostly used for insomnia, palpitation, epilepsy, madness and dizziness.

Forged keel has strong astringency, and is mostly used for spontaneous sweating, night sweats, nocturnal emission, leukorrhagia, chronic diarrhea, and sores and carbuncle disharmony.

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Lei Gong processed the liquid medicine.