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According to *Shiliao* (Dietary Therapy): If there is deficiency and weakness of Kidney Qi (Kidney energy), take an appropriate amount of raw chestnuts, dry them in the wind. Chew three or five pieces finely every day on an empty stomach, and swallow slowly.

Immortals who consume Polygonatum sibiricum (Huangjing, 黄精) can become Earthly Immortals: In the past, a scholar in Linchuan abused his maid, so she fled into the mountains. After a long time, she saw wild grass with lovely leaves and branches, plucked them, and ate them; they tasted very delicious. From then on, she often consumed them. Over time, she no longer felt hungry, and her body became light and agile. One night, resting under a large tree, she heard movement in the grass and thought it was a tiger. Fearing for her life, she climbed the tree to hide. When dawn broke and she descended to the flat ground, she felt suddenly refreshed and seemed to fly through the air, sometimes leaping from the peak of one mountain like a flying bird. Years later, her family saw her while gathering firewood in the mountains and told her master, who sent people to capture her but failed. One day, at the foot of a sheer cliff, they surrounded her with nets on three sides. Suddenly, she soared up to the mountaintop. The master was amazed and someone said, "How could this maid have the demeanor of an immortal? It must be due to consuming spiritual herbs." So, they placed wine, food, and fragrant flavors along her path to see if she would eat them. She indeed came to eat them, which prevented her from escaping far away, and she was captured. When asked about the cause, the herb she pointed to as having been eaten was Polygonatum sibiricum (Huangjing, 黄精). Respectfully noted: Polygonatum sibiricum (Huangjing, 黄精) soothes the middle and benefits Qi (vital energy), tonifies the Five Zang organs (Heart, Liver, Spleen, Lung, Kidney), harmonizes muscles, enriches marrow, strengthens bones and sinews, prolongs life, brightens complexion, turns white hair black again, and causes fallen teeth to regrow.

When Emperor Wu of Han toured eastward to the foot of Mount Tai, he saw an old man hoeing by the road, with a white light shining several feet high above his back. The Emperor found this strange and asked him if he possessed Daoist arts. The old man replied, "When I was eighty-five years old, I was frail and near death, with white hair and lost teeth. A Daoist priest taught me to consume dates, drink water, practice Juegu (abstaining from grains), and make a Divine Pillow method, which contained thirty-two ingredients. Twenty-four of these were beneficial, corresponding to the Twenty-Four Solar Terms; the other eight were toxic, corresponding to the Eight Winds. After practicing this, I appeared younger, my black hair grew back, and my lost teeth reappeared. I could walk three hundred li per day. I am now one hundred and eighty years old. I cannot abandon the world to enter the mountains because I cherish my descendants, so I resumed eating grains. It has been over twenty years since then, yet thanks to the power of the Divine Pillow, I have not aged further." Emperor Wu looked at the old man and saw his face looked vigorous, like that of a man in his fifties. He verified this with the neighbors, who confirmed it was true. The Emperor then requested the formula to make the pillow but could not follow the practices of Juegu (abstaining from grains) and drinking only water.

Divine Pillow Formula: Use cypress wood collected on the fifth day of the fifth lunar month and the seventh day of the seventh lunar month to make the pillow core. It should be one chi two cun long, four cun high, with a hollow center holding one dou two sheng. Use cypress heart wood that is red as the lid, with a thickness of two fen. Cover it tightly to ensure it is sealed, yet allow for opening and closing. Drill three rows of holes on the lid, forty-nine holes per row, totaling one hundred and forty-seven holes, sized to hold millet grains. Use the following herbs:
Ligusticum chuanxiong (Chuanxiong, 川芎), Angelica sinensis (Danggui, 当归), Angelica dahurica (Baizhi, 白芷), Magnolia biondii (Xinyi, 辛夷), Duheng (Du Heng, 杜衡), Atractylodes macrocephala (Baizhu, 白术), Ligusticum wallichii (Gaben, 藁本), Magnolia officinalis (Mulan, 木兰), Zanthoxylum schinifolium (Shujiao, 蜀椒), Cinnamomum cassia (Guizhi, 桂), Zingiber officinale (Ganjiang, 干姜), Saposhnikovia divaricata (Fangfeng, 防风), Panax ginseng (Renshen, 人参), Platycodon grandiflorus (Jiegeng, 桔梗), Cynanchum atratum (Baiwei, 白薇), Tribulus terrestris (Jingshi, 荆实), Cistanche deserticola (Roucongrong, 肉苁蓉), Carduus crispus (Feilian, 飞廉), Platycodon grandiflorus seeds/Baijiu (Baishi, 柏实 - likely Cypress seeds), Coix lacryma-jobi (Yiyiren, 薏苡仁), Farfarae Flos (Kuandonghua, 款冬花), Baiheng (Bai Heng, 白衡 - possibly a variant or error for another herb), Zanthoxylum bungeanum (Qinjiao, 秦椒), Elsholtzia splendens (Miwan, 麋芜).
These twenty-four ingredients correspond to the Twenty-Four Solar Terms.
Aconitum carmichaelii (Wutou, 乌头), Aconitum carmichaelii processed (Fuzi, 附子), Veratrum nigrum (Lilu, 藜芦), Gleditsia sinensis (Zaorao, 皂角), Cao (Grass - text incomplete/ambiguous), Alum (Fanshi, 矾石), Pinellia ternata (Banxia, 半夏), Asarum heterotropoides (Xixin, 细辛).
These eight toxic ingredients correspond to the Eight Winds.
Take one qian of each of the above thirty-two ingredients, all cut into small pieces. Place the toxic ingredients on top, fill the pillow completely, and wrap the pillow in a cloth bag. After one hundred days, the pillow will shine. Within one year, bodily ailments will cease, all illnesses will heal, and the body will emit fragrance. After four years, white hair will turn black, lost teeth will regrow, and hearing and vision will become sharp. This is a miraculous and secret formula, not to be passed to unworthy persons. When Emperor Wu asked Dongfang Shuo about this, he answered, "In the past, Nü Lian transmitted this to Yu Qing, Yu Qing to Guangchengzi, and Guangchengzi to the Yellow Emperor. Recently, a Daoist priest named Chunyu Gong from Gu Cheng used this medicinal pillow and lived over a hundred years without white hair. Diseases arise from the Yang meridians. Now, by using a medicinal pillow, wind-pathogens cannot invade." He added, "Although wrapped in a cloth bag, it should be further wrapped in a silk pouch, removing it only when ready to sleep." The Emperor bestowed a bolt of silk upon the old man, but the old man refused, saying, "My relationship to Your Majesty is like that of a son to a father. A son who understands the Way offers it to his father and does not accept reward according to righteousness. Moreover, I do not sell the Way; I offer this because Your Majesty loves goodness." The Emperor ceased the bestowal of silk and instead granted him various medicines.