Guilinggao
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Guīlínggāo (Traditional Chinese: 龜苓膏) is a Chinese medicine that is made with three-lined box turtles (金錢龜) and China roots (土伏苓). It is also used as a dessert, made in form of a jelly.
It is believed that Emperor Tongzhi nearly cured his smallpox by taking Guilinggao. However, Empress Cixi believed his disease could be cured by worshipping a smallpox idol. She succeeded in convincing Tongzhi to quit his Guilinggao regimen. As a result, the emperor died.