What do the Taoist Inner Dan and Outer Dan mean?

External refining and internal repair! Refining-use medical stone-Yan Rong, brine, alum, oyster, halloysitum rubrum, talc, and Hu Fen as the six mud, and simmer for 998 1 hour. By then. For Dan, it has been abandoned. Xiu Yuan-The upper, middle and lower abdomen are the tripod, and the baby is born when you hold it as one. Di Zhen said, "When there is a surname, it is nine minutes long for a man and six minutes long for a woman, or two inches and four minutes under the navel, or one inch under the heart of the Golden Palace, or between people's eyebrows. The only inch is the Hall of Fame, two inches is the bridal chamber, and three inches is the upper abdomen." Xiu Yuan is dangerous at heart.