神仙服气法，存心如婴儿在母胎，十月成就，筋骨和柔，以心息念，和气自至，呼吸如
法，咽之不饥，百毛孔开，息无壅滞，常取六阳时食生气，则气力日增矣。
取阳时法
半夜子，服九九八十一。
平旦寅，服八八六十四。
食时辰，服七七四十九。
正中午，服六六三十六。
晡时申，服五五二十五。
黄昏戌，服四四一十六。
夫服气法，须能去气，去气须根据门户出入，鼻为天门，服气魂魄归天门，口为地户，服
气魂魄归地户，黄庭经云，百谷之实土地精，五味外美邪魔腥，玉池清水灌灵根，子能修之
补命门，从鼻口出入，即为顺气，根据此不辍，下却三尸，舍荣去爱，日渐成功。始近道矣。
真人本性幽闲，发言合道，心行无瑕，漱咽灵津，服之百味自足，通三焦，理正气，气
自周遍，大通五脏，骨髓坚溢，夫道为万气之主，道者气也，气为精门，能保精气，精气两
足，是名真人，人有三丹田，其中各有三神，气漏即精泄，精泄即神伤，精者物之真，长生
之根，精全则气全，精泄则气泄，唯精与气，须保全之。
凡入气为阴，出气为阳，此二者服日月精华也，外内自安静，安静即神定，神定即气和
，气和即元气自至，元气自至，即五脏滋润，五脏滋润，即百脉流通，百脉流通，即津液上
应，津液上应，即不思五味，绝饥渴，气化为血，血化为髓，一年易气，二年易血，三年易
脉，四年易肉，五年易髓，六年易骨，七年易发，八年易筋，九年易形，为真炼九还，通于
仙矣。
真理六气诀，嘘属肝，呵属心， 属肺，吹属肾，呼属脾，嘻属三焦，六气各有所理，
五脏有疾，皆属于心，心主呵，诸疾皆可愈，初学人但食少淡粥或胡麻，益气生津液，忌吃
热食，悖乱正气，凡欲食，先服三五咽气与食作主人，兼每早先服二十颗椒，清酒一杯，冬
温夏冷，戒在过度，切忌冲见新产死亡，及食油腻肥鲜臭秽等物。
凡服气，静定安坐寂然，瞑目叩齿，闭口鼓腹，令气满口即咽，至九下一息，春夏服冷
气，秋冬服暖气，每至五更，两掌掩口，用力呵掌中，津液生，即摩拭面目，令得光泽，时
时含枣蜜汤助之，日日减食，朝朝服气，气即易成，昔人谓饥食自然气，渴饮华池浆者，此
也。
神仙服气法，要求意念如同婴儿在母胎中一样，经过十个月的孕育而成熟，使筋骨调和柔顺。通过用心控制呼吸和念头，和气自然到来，呼吸合乎法度，吞咽后不感到饥饿，全身毛孔张开，气息没有壅滞堵塞。经常在六个阳气旺盛的时辰（六阳时）摄取生气，那么气力就会日益增加。
取用阳气时辰的方法：
半夜子时，服用九九八十一口。
清晨寅时，服用八八六十四口。
食时辰时，服用七七四十九口。
正中午时，服用六六三十六口。
傍晚申时，服用五五二十五口。
黄昏戌时，服用四四十六口。
所谓服气法，必须能够排出体内的浊气。排出浊气必须依据门户进出：鼻子是天门，吸入清气魂魄归于天门；嘴巴是地户，吸入清气魂魄归于地户。《黄庭经》说：“百谷之实土地精，五味外美邪魔腥，玉池清水灌灵根，子能修之补命门。”从鼻口出入呼吸，就是顺气。坚持这样做不停止，就能除去三尸虫，舍弃荣华与私爱，日渐取得成功，开始接近大道了。
真人本性幽静闲适，言语符合大道，心行没有瑕疵，漱口咽下灵津液，服用后各种滋味自然充足，疏通三焦，调理正气，气自然周遍全身，大通五脏，骨髓坚固充盈。道是万气的主宰，道就是气，气是精气之门，能够保全精气，精气两足，这就叫做真人。人有三丹田，其中各有三位神君。气漏则精泄，精泄则神伤。精是物的真元，长生的根本。精全则气全，精泄则气泄。只有精与气，必须加以保全。
凡是吸气进入为阴，呼气出去为阳，这两者是在服用日月精华。内外自然安静，安静则神定，神定则气和，气和则元气自然到来。元气自然到来，则五脏滋润；五脏滋润，则百脉流通；百脉流通，则津液上应；津液上应，则不想吃五味食物，断绝饥渴感。气化为血，血化为髓。一年改变气，二年改变血，三年改变脉，四年改变肉，五年改变髓，六年改变骨，七年改变头发，八年改变筋，九年改变形体，这就是真正的炼九还丹，通达成仙的境界。
真理六气诀：嘘字诀属肝，呵字诀属心，呬字诀属肺，吹字诀属肾，呼字诀属脾，嘻字诀属三焦。六气各自有其所治理的脏腑。五脏有病，都归属于心。心主呵字诀，各种疾病都可以痊愈。初学的人只吃少量的淡粥或胡麻，以益气生津液。忌吃热食，以免扰乱正气。凡是要吃东西之前，先服用三五口真气作为食物的主人，并且每天早晨先服用二十颗花椒，配一杯清酒，冬天温热喝，夏天冷喝，戒除过度。切忌冲撞见到刚生产完的产妇、死者，以及食用油腻肥鲜臭秽等食物。
凡是服气，要静定安坐，寂然无声，闭目叩齿，闭口鼓腹，让气充满口腔然后吞咽，每九次吞咽配合一次呼吸。春夏服用冷气，秋冬服用暖气。每到五更天，用两手掌掩住口，用力向掌中呵气，津液产生，就用来摩擦擦拭面目，使其得到光泽。时时含服枣蜜汤来辅助它，天天减少进食，早晨服用真气，气就容易成就。古人说“饿了吃自然之气，渴了喝华池之浆”，指的就是这个。
The method of Immortal Qi Swallowing requires maintaining the mind as if an infant were in the mother's womb, completing ten months of gestation to achieve maturity, thereby harmonizing and softening the sinews and bones. By using the heart to control breath and thoughts, Harmonious Qi (Heqi) arrives naturally; breathing follows proper methods, swallowing prevents hunger, all hundred pores open, and breath flows without obstruction. Frequently consuming Vital Qi (Shengqi) during the six Yang hours causes physical strength to increase daily.
Methods for Utilizing Yang Hours:
At midnight (Zi hour), swallow 81 times (9x9).
At dawn (Yin hour), swallow 64 times (8x8).
During the eating time (Chen hour), swallow 49 times (7x7).
At noon (Wu hour), swallow 36 times (6x6).
In the afternoon (Shen hour), swallow 25 times (5x5).
At dusk (Xu hour), swallow 16 times (4x4).
The method of Qi swallowing requires the ability to expel turbid Qi. Expelling Qi must follow the gates of entry and exit: the nose is the Heavenly Gate (Tianmen), where inhaled clear Qi and soul return; the mouth is the Earthly Door (Dihu), where inhaled clear Qi and soul return. The *Huangting Jing* (Yellow Court Classic) states: "The fruits of a hundred grains are the essence of the earth; though five flavors may seem delicious externally, they harbor evil and fishy odors. Clear water from the Jade Pool irrigates the spiritual root; if you can cultivate this, it supplements the Life Gate (Mingmen)." Breathing in and out through the nose and mouth constitutes following the natural flow of Qi (Shunqi). Persisting in this without ceasing eliminates the Three Corpses (Sanshi), discards worldly glory and selfish desires, leads to gradual success, and brings one close to the Dao.
A True Person (Zhenren) possesses a nature that is quiet and leisurely, speaks in accordance with the Dao, and has flawless mental conduct. Rinsing the mouth and swallowing Spiritual Saliva (Lingjin) ensures that all flavors are naturally sufficient. It unblocks the Sanjiao (Triple Burner), regulates Righteous Qi (Zhengqi), allowing Qi to circulate throughout the body, thoroughly benefiting the Five Zang Organs, making the bone marrow firm and abundant. The Dao is the master of all Qi; the Dao is Qi. Qi is the gate of Essence (Jing). Preserving Essence and Qi, when both are full, is called being a True Person. Humans have three Dantians (Elixir Fields), each containing three deities. If Qi leaks, Essence is lost; if Essence is lost, Spirit (Shen) is injured. Essence is the true substance of things and the root of longevity. When Essence is complete, Qi is complete; when Essence leaks, Qi leaks. Only Essence and Qi must be preserved.
Inhaling Qi is Yin, exhaling Qi is Yang; these two practices involve consuming the essence of the sun and moon. External and internal states become naturally tranquil; tranquility stabilizes the Spirit; stabilized Spirit harmonizes Qi; harmonized Qi allows Original Qi (Yuanyuan) to arrive naturally. When Original Qi arrives, the Five Zang Organs are moistened; when the Five Zang Organs are moistened, the hundred vessels flow freely; when the hundred vessels flow freely, Body Fluids (Jinye) respond upwards; when Body Fluids respond upwards, there is no desire for the five flavors, and hunger and thirst are cut off. Qi transforms into Blood, and Blood transforms into Marrow. In one year, Qi changes; in two years, Blood changes; in three years, Vessels change; in four years, Flesh changes; in five years, Marrow changes; in six years, Bones change; in seven years, Hair changes; in eight years, Tendons change; in nine years, Form changes. This is the true refinement of the Nine Returns (Jiu Huan), leading to immortality.
The Truthful Six Qi Mantras: Xu (嘘) belongs to the Liver, He (呵) belongs to the Heart, Si (呬) belongs to the Lungs, Chui (吹) belongs to the Kidneys, Hu (呼) belongs to the Spleen, Xi (嘻) belongs to the Sanjiao. Each of the Six Qi governs specific aspects. Diseases of the Five Zang Organs all relate to the Heart. The Heart governs the He mantra, through which various diseases can be healed. Beginners should eat only small amounts of light congee or sesame seeds to benefit Qi and generate fluids. Avoid hot food, which disrupts Righteous Qi. Before eating, first swallow three to five mouthfuls of Qi to act as the host for the food. Additionally, every morning, take twenty Sichuan peppercorns with a cup of clear wine; warm in winter, cool in summer. Avoid excess. Strictly avoid encountering newly delivered women or corpses, and avoid eating greasy, rich, fresh, foul-smelling foods.
When practicing Qi swallowing, sit quietly and steadily, silent and still, close the eyes, click the teeth, close the mouth, and distend the abdomen until the mouth is full of Qi, then swallow. Perform nine swallows per breath cycle. In spring and summer, consume cold Qi; in autumn and winter, consume warm Qi. At every fifth watch (wugeng), cover the mouth with both palms, exhale forcefully into the palms to generate saliva, then rub and wipe the face to impart luster. Occasionally drink jujube honey soup to assist. Daily reduce food intake and practice Qi swallowing in the morning; Qi will easily form. As the ancients said, "Eat natural Qi when hungry, drink Hua Chi fluid when thirsty," referring to this practice.