How old is Guiling Ointment?

Eight hundred years ago, Yuan soldiers invaded Lin 'an in the Southern Song Dynasty and moved to Xinya Mountain (now Jiangmen City, Guangdong Province) with the young emperor. About 200,000 soldiers and civilians moved northward, and some scholars in South Guangdong vomited and diarrhea, which seriously affected their combat effectiveness. 800 years ago, at the end of the Southern Song Dynasty, doctors in Lu Xiufu explored the basis of Mesona blume, improved the secret recipe of the original palace diet for clearing away heat and nourishing, and added raw materials such as Caragana, Poria, dandelion, honeysuckle and so on into the paste medicine made from the special Mesona blume in Xinyashan. From the Yuan Dynasty to the Yuan Dynasty (A.D. 1366), the third generation grandchildren of Lu Xiu suffered from extreme high temperature and humidity among the people. According to the ancestral secret recipe, Guiling Ointment Jishi Decoction is made of traditional ingredients such as Xiancao, Xiancao (Xiancao), Poria, honeysuckle, dandelion, licorice and tortoise, combined with traditional and modern technologies.