味甘，平，无毒。主除胃中热、喘息、烦满，止渴，屑如麻豆服之。久服轻身长年。生
蓝田，采无时。（恶鹿角。）
此云玉屑，亦是以玉为屑，非应别一种物也。《仙经》服珏玉，有捣如米粒，乃以苦酒
辈，消令如泥，亦有合为浆者。凡服玉，皆不得用已成器物，及冢中玉璞也。好玉出蓝田，
及南阳徐善亭部界中，日南、卢容水中，外国于阗、疏勒诸处皆善。《仙方》名玉为玄真，
洁白如猪膏，叩之鸣者，是真也。其比类甚多相似，宜精别之。所以燕石入笥，卞氏长号也。
（《新修》三页，《大观》卷三，《政和》八一页）
味甘，平，无毒。主治五脏百病，柔筋强骨，安魂魄，长肌肉，益气，利血脉，治妇人
带下十二病，除气癃，明耳目。久服耐寒暑，不饥渴，不老神仙，轻身长年。人临死服五斤，
死三年色不变。一名玉札，生蓝田山谷，采无时。（畏款冬花。）
蓝田在长安东南，旧出美玉，此当是玉之精华，白者质色明澈，可消之为水，故名玉泉。
今人无复的识者，惟通呼为玉尔。张华又云∶服玉用蓝田珏玉白色者，此物平常服之，则应
神仙。有人临死服五斤，死经三年，其色不变。古来发冢见尸如生者，其身腹内外，无不大
有金玉。汉制，王公葬，皆用珠襦玉匣，是使不朽故也。炼服之法，亦应依《仙经》服玉法，
水屑随宜，虽曰性平，而服玉者亦多乃发热，如寒食散状。金玉既天地重宝，不比余石，若
未深解节度，勿轻用之。（《新修》三页，《大观》卷三，《政和》八二页）
Sweet in taste, neutral in nature, non-toxic. It primarily treats heat in the stomach, panting (asthma), vexation and fullness, relieves thirst, and is taken when ground into fragments the size of hemp seeds or beans. Long-term consumption makes the body light and prolongs life. It grows in Lantian, and can be gathered at any time. (It is incompatible with Lu Jiao [Cervus Cornu].)
The term "Yu Xie" (Jade Fragments) mentioned here refers to jade ground into fragments; it does not refer to a different substance. The *Xian Jing* (Immortal Classic) records taking jade: some methods involve pounding it until it resembles rice grains, then dissolving it with vinegar-like liquids until it becomes mud-like; others combine it into a paste. In all cases of taking jade, one must not use already-made artifacts nor jade uncarved from tombs. High-quality jade comes from Lantian, as well as the territory of Xushanting in Nanyang, waters of Rinnan and Lurong, and foreign regions such as Khotan and Shule, all of which produce excellent jade. The *Xian Fang* (Immortal Formula) calls jade "Xuan Zhen"; true jade is white and clean like lard and rings clearly when struck. There are many similar-looking stones, so careful distinction is required. This is why Yan Shi (swallow stone) was put away in a chest, leading to Bian He's long weeping. (From *Xinxiu Bencao*, p. 3; *Daguan Bencao*, Vol. 3; *Zhenghe Bencao*, p. 81.)
Sweet in taste, neutral in nature, non-toxic. It treats diseases of the five zang organs and hundred ailments, softens sinews and strengthens bones, calms the hun and po spirits, promotes muscle growth, tonifies qi, benefits the blood vessels, treats twelve types of leukorrhea in women, resolves qi stagnation and strangury, and clarifies the ears and eyes. Long-term consumption enables resistance to cold and heat, eliminates hunger and thirst, leads to immortality as an immortal, makes the body light, and prolongs life. If a person consumes five jin before death, their complexion remains unchanged for three years after death. Also known as "Yu Zha," it grows in the valleys of Lantian and can be gathered at any time. (It fears Kuandonghua [Adenophorae Radix].)
Lantian is located southeast of Chang'an and historically produced beautiful jade; this should be the essence of jade. White jade has a clear and transparent texture and can be dissolved into water, hence the name "Yu Quan" (Jade Spring). People today no longer recognize it precisely, generally just calling it jade. Zhang Hua further stated that for taking jade, one should use white jade from Lantian; regular consumption of this material would lead to becoming an immortal. Someone who consumed five jin before death remained unchanged in color for three years after death. Since ancient times, excavated corpses that appeared alive had large amounts of gold and jade inside and outside their bodies. In Han dynasty regulations, kings and dukes were buried with pearl jackets and jade coffins to ensure imperishability. The method of refining and consuming should follow the jade-taking methods in the *Xian Jing*. Water-ground jade fragments should be used as appropriate. Although its nature is neutral, those who take jade often experience fever, resembling the symptoms after taking Hanshi San (Cold Food Powder). Gold and jade are both heavy treasures of heaven and earth, unlike other stones. If one has not deeply understood the proper dosage and precautions, do not use them lightly. (From *Xinxiu Bencao*, p. 3; *Daguan Bencao*, Vol. 3; *Zhenghe Bencao*, p. 82.)