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[Ren Ya (Human Tooth)]
Properties and Flavor: Salty, warm, toxic.
Functions and Applications: Treats inverted smallpox/rash lesions (The *Dou Zhen Lun* [Treatise on Rash and Smallpox] records: for lesions that fail to erupt properly and appear black and depressed, take one qian mixed with pig's blood; for those depressed due to the astringent effect of cold-natured medicines, take musk mixed with wine. Li Shizhen stated: The purpose is to guide the medicinal action into the Kidney Meridian to expel toxic qi; it is a drastic remedy. If there is latent toxin in the Heart causing coma and unconsciousness, or if there are conditions of Qi deficiency with pale complexion, itching and depression without pus, or heat-related miliaria and purple blisters, only tonifying deficiency and detoxification should be used. Misuse of this substance will lead to oppression and hoarseness, potentially resulting in untreatable conditions). Ground powder can also be used to clear fire-toxin.

[Ren Ru (Human Milk)]
Properties and Flavor: Sweet, salty.
Functions and Applications: Tonifies deficiency and moistens dryness. It moistens the Five Viscera, supplements blood, stops thirst (Xiao Ke), nourishes the skin, and treats Wind-Fire syndromes (Wang Ang noted: For elderly people with constipation, human milk is most beneficial).
Human milk is transformed from blood; the eyes gain vision through blood nourishment, so it can be used as eye drops for redness, astringency, and excessive tearing (if heat-type, use Huanglian [Coptidis Rhizoma] infusion for dropping). However, its nature is cold and slippery, so it is not suitable for frequent consumption by those with cold viscera and weak stomachs (Li Shizhen said: Human milk has no fixed nature. If the mother is peaceful and her diet is bland, her milk will be neutral. If she is irritable, drinks alcohol, eats spicy food, or suffers from heat diseases, her milk will be hot. Additionally, milk during pregnancy is called "Taboo Milk," which is highly toxic; infants consuming it may suffer vomiting and diarrhea, developing malnutrition and stunted growth diseases, and it may also harm the fetus internally).
Wang Ang noted: Milk is transformed from Yin-Blood, originates from the Spleen and Stomach, and is regulated by the Chong and Ren vessels. Before conception, it flows downward as menstruation; after conception, it remains inside to nourish the fetus; after childbirth, it changes from red to white, flows upward as milk to feed the infant, representing the profound subtlety of creation. Consuming it benefits Qi and Blood, supplements brain marrow, embodying the concept of "using humans to nourish humans." However, it can cause loose bowels, dampen the Spleen, and clog the diaphragm; it was designed by Heaven specifically for infants, not for strong adults to consume regularly. Only when processed into powder does it offer benefits without harm, but it must be prepared fresh for immediate use, as it develops an oily rancid smell over time. It is best to use milk from a single woman; mixed milk results in mixed qi. Mixing equal parts of human milk powder and Ginseng Radix powder, formed into pills with honey, creates Shen Ru Wan (Ginseng Milk Pill), which greatly tonifies Qi and Blood.
Select milk from young, healthy women; white and thick milk is ideal, comparable to what an infant consumes. Yellow, reddish, thin, or foul-smelling milk is unsuitable. It can be dried in the sun and preserved with Poria Cocos powder, or boiled in water to extract the powder, which is even better. The method for extracting powder is as follows: Boil water in a small pot until rolling. Use a silver ladle about the size of a bowl (a tin ladle is also acceptable). Pour a small amount of milk into the ladle, let it float and cook on the boiling water surface, then place it on cold water to solidify and dry. Scrape off the powder for use. Repeat the boiling and scraping process, similar to making rice noodle sheets.