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）
味甘，性平，无毒。主要治疗胃中热邪、喘息、烦闷胀满，止渴，将玉磨成如麻豆大小的碎屑服用。长期服用可使身体轻盈、延年益寿。产于蓝田，采集没有固定时间。（忌与鹿角同用。）
这里所说的“玉屑”，也是指将玉磨成碎屑，并非指另一种不同的物质。《仙经》中记载服用玉，有将其捣碎如米粒大小，再用醋等液体消解使其变成泥状，也有将其合成为浆液的。凡是服用玉，都不得使用已经制成的器物，以及墓穴中的玉璞。优质的玉产于蓝田，以及南阳徐善亭部境内，日南、卢容水中，外国于阗、疏勒等地出产的也都很好。《仙方》称玉为“玄真”，洁白如猪油，敲击时声音清脆鸣响的，才是真玉。其相似之物很多，应当仔细辨别。所以燕石被放入衣箱，卞和因此长声痛哭。（出自《新修本草》第三页，《大观本草》卷三，《政和本草》第八十一页）
味甘，性平，无毒。主治五脏百病，柔润筋骨、强健骨骼，安定魂魄，促进肌肉生长，益气，通利血脉，治疗妇人带下十二种疾病，消除气滞癃闭，使耳目清明。长期服用可耐寒暑，不饥不渴，成为不老的神仙，身体轻盈、延年益寿。人在临死前服用五斤，死后三年尸体颜色不变。又名“玉札”，产于蓝田山谷，采集没有固定时间。（畏款冬花。）
蓝田位于长安东南，旧时出产美玉，这应该是玉的精华部分，白色的质地明澈，可以消解化为水，所以名叫“玉泉”。如今的人不再能确切识别，只普遍称为玉罢了。张华又说：服用玉应选用蓝田白色珏玉，这种物品平时服用，就能成仙。有人临死前服用五斤，死后经过三年，其面色不变。自古以来发掘墓穴见到尸体如同活人一样，其身体腹部内外，无不大量含有金玉。汉代制度，王公贵族下葬，都用珠襦玉匣，是为了使尸体不朽的缘故。炼制的服食方法，也应依照《仙经》中服玉的方法，用水磨成的玉屑随宜使用，虽然玉性平，但服用玉的人也多有发热，如同服用寒食散后的症状。金玉既然是天地的重宝，不同于其他石头，如果未深刻理解节度禁忌，不要轻易使用。（出自《新修本草》第三页，《大观本草》卷三，《政和本草》第八十二页）
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.)