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In women with a thin physique who have been unable to conceive for a long time, sexual intercourse immediately causes them to fall ill and remain in bed all day. People attribute this to Qi deficiency (Qi Xu), but little do they know it is actually due to Blood deficiency (Xue Xu). Some argue that Blood resides in the Liver (Gan) and Essence (Jing) is contained in the Kidney (Shen); since intercourse depletes Kidney Essence, what does it have to do with Blood deficiency? They fail to realize that if Liver Qi (Gan Qi) does not flow freely, Essence cannot be discharged; and once Kidney Essence is discharged, Liver Qi cannot relax. Since the Kidney is the Mother of the Liver, when the "Mother" depletes Essence, it cannot distribute nourishment to feed its "Child" (the Liver). This leads to dryness of Wood (Liver) lacking Water (Kidney) support, while latent Fire (Huojing) moves secretly to scorch Essence, causing further Kidney deficiency. Moreover, thin people tend to have internal Heat/Fire, and depleting Essence further reduces Water while intensifying Fire. Although Water controls Fire, the emptiness of Kidney Essence renders it powerless to assist, resulting in a state resembling the hexagram Ji Ji (Water over Fire, indicating imbalance/disharmony in this context), hence the fatigue and desire to lie down. Such women are prone to moving Fire easily, yet this Fire arises from the Liver Wood due to lustful desires; it is a deficient, dry Fire, not true Excess Fire (Zhen Huo). If intercourse does not occur, fine; but if it does, leakage or premature ejaculation occurs easily. This is Yin Deficiency with Hyperactive Fire (Yin Xu Huo Wang), which prevents conception. Even if conception occasionally occurs, it may force the depletion of the male's Essence, causing the conceived seed to dissipate immediately. The treatment method must strongly tonify Kidney Water (Shen Shui) and soothe Liver Wood (Gan Mu). When Water is abundant, Blood becomes abundant; when Blood is abundant, Fire subsides, creating a harmonious state resembling the hexagram Wei Ji (Fire over Water, symbolizing proper interaction/nourishment here).

The prescription is Yang Jing Zhong Yu Tang (Nourish Essence and Seed Jade Decoction).
Prepared Rehmannia Root (Shu Di Huang, 1 liang, steamed nine times)
Angelica Sinensis Root (Dang Gui, 5 qian, washed with wine)
White Peony Root (Bai Shao, 5 qian, stir-fried with wine)
Cornus Officinalis Fruit (Shan Yu Rou, 5 qian, steamed until soft)
Decoct in water and take orally. After three months, the body will become robust and capable of conception, thus meeting the conditions for seeding. The function of this formula is not merely to tonify Blood, but purely to fill Essence. When Essence is full, the uterus easily captures sperm; when Blood is sufficient, the uterus easily accommodates the fetus. These are the ways to bear children. However, those indulging in lust are many, while those practicing moderation are few, so efficacy is often not achieved. Those taking this medicine must truly practice sexual abstinence/moderation for three months and keep their mind clear and calm; otherwise, there is no reason for infertility. If they do not, they will only become physically robust, so do not blame the formula for being ineffective.

Marginal Note: If pregnancy does not occur after three months of medication, add Cyathula Root (Guan Zhong, 2 qian) to the original prescription. Stir-fried Eucommia Bark (Du Zhong, 2 qian), Dipsacus Root (Xu Duan, 2 qian), Earth-fried Atractylodes Macrocephala Rhizome (Bai Zhu, 5 qian), and Scorched Poria (Jiao Fu Ling, 3 qian). After taking several doses, pregnancy will surely occur.

Verse:
Women thin and weak, infertility arises,
Liver Wood dry, Kidney Water empty lies.
Tonify Kidney Water to nourish Liver Wood,
When Water thrives and Fire fades, conception succeeds.
Yang Jing Zhong Yu values the generation of offspring,
Take medicine and moderate desire for three months whole.
Angelica, Prepared Rehmannia, White Peony,
Cornus, these four ingredients nourish Kidney Essence.