| | Chen Yongbo was a native of Nanyang. He obtained the "Qi Li San" formula from the Prince of Huainan, and after testing it by mixing and taking it, on the twenty-first day he suddenly disappeared without a trace. Yongbo had a nephew named Zengzu, who was seventeen years old. He also took the medicine. His father tied his feet and locked him in a closed room, keeping people to guard and watch over him day and night. On the twenty-eighth day, he also disappeared without being seen again, and his whereabouts became unknown. The original formula stated: "After taking it for thirty days, one becomes an immortal." However, the two sons of the Chen family took it for less than thirty days and then lost their whereabouts. Afterwards, people dared not take it, because immortals must be received by immortal officials who come to welcome them, but ordinary people simply do not see this happening.
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