既得阿井纯阴之济水，又得纯黑补阴之驴皮，气味俱阴功力自大，味淡性平，入手
太阴，足少阴，厥阴经，为补精养血，滋肝补肾，更能入肺肾，补不足，盖肺主气，肾
纳气也，故既专补血，复能益气。凡吐血、衄血、血淋、尿血、肠风下血、血痢、女子
血气痛。血枯、崩中带下，胎前产后诸疾，及虚劳咳嗽，肺痿肺痈脓血杂出等症神效
者，皆取其入肺入肾，益阴滋水补血清热之功也。
阿胶，主心腹内崩劳极，洒洒如疟状，腰腹痛，四肢酸痛，养血安胎，阴气不足。
脚酸不能久立，久咳脓血，血崩带下，羸瘦劳伤，咳嗽喘急，吐血衄血，淋尿血，肠风
血痢，肺痿肺痈，润燥养肝，化痰清肺，更主女人下血。凡血痛血枯，调经崩中，胎产
诸疾皆妙。久服轻身益气，补血和血之圣药也。又牛皮胶，名为水胶，润燥利大小肠。
为外科活血止痛要药，兼治一切男妇血症，诸胶皆养血补虚，而阿胶又黑驴皮阿井水所
熬，即济水所潴其色正绿，性极下趋，清而且重，其性纯阴，与诸水大别，所以尤能滋
肺养肝滋肾也。
按∶阿井乃济水之眼，《内经》以济水为天地之肝，故入肝多功，乌骡皮合北方水
色，顺而健行之物，故入肾多功，水充则火有制，火息则风不生，故木旺风淫，火盛金
衰之症，莫不应手取效。凡用当择光如漆带油丝者为真，真者折之即断，体坚而脆，味
淡不臭，夏月不湿软，不粘纸者为佳，宜切块蛤粉拌炒成珠或洒化成膏。
阿胶既汲取了阿井中纯阴性质的济水，又采用了纯黑色、具有补阴功效的驴皮，其气味均属阴，因此功力宏大。它味道淡、性质平和，归入手太阴肺经、足少阴肾经和厥阴肝经。它是补精益血、滋养肝脏和肾脏的药物，更能深入肺肾二脏，补充身体的不足。因为肺主气，肾纳气，所以阿胶既能专门补血，又能辅助益气。对于吐血、鼻出血（衄血）、血淋、尿血、肠风下血、血痢、女子血气痛、血枯经闭、崩漏及带下病，以及胎前产后各种疾病，还有虚劳咳嗽、肺痿、肺痈脓血混杂排出等症状，使用它都有神效，这都是因为它能入肺入肾，发挥益阴滋水、补血清热的功效。
阿胶主治心腹内部崩漏、极度虚弱如疟疾般寒战的症状、腰腹痛、四肢酸痛，能养血安胎，治疗阴气不足引起的脚酸不能久立、长期咳嗽咳出脓血、血崩带下、身体消瘦劳伤、咳嗽喘急、吐血鼻出血、淋证尿血、肠风血痢、肺痿肺痈等症；它能润燥养肝，化痰清肺，更主要的是治疗妇女下部出血。凡是血痛、血枯、调经、崩中、胎产诸疾，效果都很奇妙。长期服用可以轻身益气，是补血和血的圣药。另外有牛皮胶，称为水胶，能润燥并通利大小肠，是外科活血止痛的重要药物，兼治男女各种血症。所有的胶都能养血补虚，但阿胶是由黑驴皮和阿井水熬制而成，而阿井水是济水积聚之处，其色正绿，性质极向下趋行，清澈且沉重，属性纯阴，与其他水源大不相同，所以尤其能够滋养肺、肝、肾。
按语：阿井是济水的源头，《内经》将济水比作天地的肝脏，所以阿胶入肝的功效多；乌骡皮符合北方水的颜色，是顺应水性且健行之物，所以入肾的功效多。水充足则火受到制约，火平息则风不生，所以对于木旺风淫、火盛金衰的病证，没有不是应手取效的。凡是用药时应当选择光泽如漆、带有油丝的为真品，真品折断即断，质地坚硬而脆，味道淡无臭味，夏季不湿软、不粘纸的为佳。宜切成块状，用蛤粉拌炒成珠状，或洒水化成膏状使用。
Ejiao (Donkey-Hide Gelatin) absorbs the pure yin nature of Ji River water from A Well, and utilizes donkey hide, which is purely black and tonifies yin. Its aroma and flavor are both yin, thereby possessing great efficacy. It has a bland taste and neutral nature, entering the Hand-Taiyin Lung Meridian, Foot-Shaoyin Kidney Meridian, and Jueyin Liver Meridian. It serves to replenish essence and nourish blood, benefiting the liver and kidneys, and can further enter the lungs and kidneys to supplement deficiencies. Since the lungs govern qi and the kidneys grasp qi, Ejiao not only specializes in nourishing blood but also assists in benefiting qi. For conditions such as hematemesis (vomiting blood), epistaxis (nosebleed), bloody strangury, hematuria, intestinal wind bleeding, bloody dysentery, women's blood and qi pain, blood dryness amenorrhea, metrorrhagia and leukorrhea, various diseases before and after childbirth, as well as deficiency consumption cough, lung萎 (lung atrophy/flaccidity), and lung abscess with mixed pus and blood, it yields miraculous results. This is due to its ability to enter the lungs and kidneys, exerting effects of benefiting yin, nourishing water, tonifying blood, and clearing heat.
Ejiao primarily treats internal collapse and exhaustion of the heart and abdomen, chills resembling malaria, lower back and abdominal pain, soreness of the four limbs, nourishes blood and calms the fetus, and addresses insufficiency of yin qi. It treats leg soreness preventing prolonged standing, chronic cough with pus and blood, metrorrhagia and leukorrhea, emaciation and injury from overwork, cough with wheezing and urgency, hematemesis, epistaxis, strangury with hematuria, intestinal wind bloody dysentery, lung flaccidity, and lung abscess; it moistens dryness and nourishes the liver, transforms phlegm and clears the lungs, and specifically treats women's lower bleeding. For all cases of blood pain, blood dryness, regulating menstruation, metrorrhagia, and obstetric and gynecological disorders, it is excellent. Long-term use lightens the body and benefits qi, making it a holy medicine for tonifying blood and harmonizing blood. Additionally, there is beef-hide gelatin, known as Shui Jiao, which moistens dryness and promotes urination and defecation through the large and small intestines. It is a crucial herb for invigorating blood and relieving pain in surgery, and also treats various blood disorders in men and women. All gelatins nourish blood and tonify deficiency, but Ejiao is boiled from black donkey hide and A Well water. The A Well water is where the Ji River accumulates; its color is truly green, its nature tends strongly downward, it is clear and heavy, and its attribute is pure yin, distinct from other waters. Therefore, it is particularly capable of nourishing the lungs, liver, and kidneys.
Note: A Well is the source of the Ji River. The *Neijing* regards the Ji River as the liver of heaven and earth, thus Ejiao has many functions entering the liver. Black mule hide corresponds to the color of water in the north, being an object that follows and moves vigorously, thus having many functions entering the kidney. When water is sufficient, fire is controlled; when fire subsides, wind does not arise. Therefore, for conditions of hyperactive wood and rampant wind, or excess fire and declining metal, no case fails to respond effectively. When using it, one should select pieces that are glossy like lacquer and contain oily threads as authentic. Authentic pieces break cleanly, are firm yet brittle, have a bland taste without odor, do not become soft and damp in summer, and do not stick to paper. These are considered superior. They should be cut into blocks, stir-fried with clam powder into beads, or melted into paste by sprinkling water.