牛黃，是一味名貴的中藥。相傳，牛黃是我國古代醫學家扁鵲在無意中發現的。一天，扁鵲正在桌上整理煅制好的金礞石。此時，鄰居陽寶殺了一頭病牛，發現牛膽囊中有些像石頭樣的東西，不知是何物，于是提著膽囊來向扁鵲請教。扁鵲剖開膽囊取出兩枚“石頭”放在桌上、仔細地琢磨。

回家不久的陽寶又驚叫著跑來說其父親一口氣上不來，在炕上抽搐不停。扁鵲急忙去陽寶家，只見陽寶的老父親雙眼上翻，喉中嚕嚕有聲。扁鵲看罷，立即吩咐陽寶快到桌上把金礞石拿來研成末，給陽寶父親灌下。須臾，陽寶的父親就止住抽搐，氣息也平靜了。扁鵲回家時卻發現桌上的兩枚牛“石頭”不見了。細尋之下，原來陽寶在慌亂中錯把牛黃當金礞石拿去了。扁鵲思忖：“難道這種石頭真的有豁痰定驚的功效？”

遂于次日，有意用其配藥，給陽寶的父親送去服之。不日，病奇跡般的好了。扁鵲就將這種黃牛膽內的深黃色之物命名為“牛黃”。

Bian Que and Niu Huang（Bezoar）

Niu Huang（Bezoar）is a blindly expensive traditional Chinese medicine.As the legend has it,it was accidently discovered by Bian Que,an ancient Chinese medical scientist.One day,Bian Que was sorting out the gold chloriti which had been calcined on the table.At that time,his neighbor Yang Bao killed a sick cow and found something like stone in the gallbladder.He didn't know what it was.So Yang Bao took the gallbladder to ask Bian Que.Bian Que opened the gallbladder and took out two "stones" on the table,watching them carefully.

After returning home for a while,Yang Bao hurriedly ran back and toldBian Que that his father could not breathe and kept twitching on the bed.Bian Que hurried to Yang Bao's home and saw that the old man turned up his eyes,making noise in his throat.Bian Que asked Yang Bao to bring the chloriti quickly which were put on the table in his home.He grounded it into powder and poured it down the throat of the patient.After a while,Yang Bao's father stopped twitching and subsequently his breath was going calm.When Bian Que returned home,he found the two cow "stones" on the table missing.Under careful examinations,he found that Yang Bao mistook it for the gold chloriti.Bian Que thought:Does the "stone" have the effect of clearing away phlegm and calming the frigntening?

The next day,he used it as a component to make medicine and sent it to Yang Bao's father.Within a few days,the old man was miraculously fully recovered.Bian Que named the dark-yellow stone in the sick cow's gallbladder as Niu Huang.