气微温，味甘平。无毒。甘，平。味薄，气升阳也。
入手太阴经、足少阴经、厥阴经。
《象》云∶主心腹痛内崩。补虚安胎，坚筋骨，和血脉，益气止痢。炮用。
《心》云∶补肺金气不足。除不足，甘温补血。出东阿，得火良。
《本草》云∶主心腹内崩，劳极，洒洒如疟状。腰腹痛，四肢酸痛，女子下血，安胎，
丈夫小腹痛。虚劳羸瘦。阴气不足，脚痛，不能久立。养肝气，益肺气。肺虚极损。咳嗽，
唾脓血，非阿胶不补。仲景猪苓汤，用阿胶，滑以利水道。《活人书》四物汤加减例，妊娠
下血者，加阿胶。
气寒，味甘。
入足少阴经。
《液》云∶猪皮，味甘，寒。猪，水畜也，其气先入肾。解少阴客热，是以猪肤解之，
加白蜜，以润燥除烦；白粉，以益气断痢。
气寒，味苦、咸。苦，寒。
《液》云∶仲景白通汤，加此汁，与人尿咸寒，同与热剂合，去格拒之寒。又，与醋相
合，内谷道中，酸苦益阴，以润燥泻便。
《本经》云∶治伤寒热渴。又∶白猪蹄，可用；杂青色者，不可食，疗疾亦不可。
《心》云∶与人尿同体，补肝而和阴引置阳，不被格拒，能入心而通脉。
Qi is slightly warm, taste is sweet and neutral. Non-toxic. Sweet, neutral. The flavor is thin, the qi ascends to nourish yang.
Enters the Hand Taiyin Lung Meridian, Foot Shaoyin Kidney Meridian, and Jueyin Liver Meridian.
Li Dongyuan (Dongyuan) states: It governs internal bleeding in the heart and abdomen. It tonifies deficiency, calms the fetus, strengthens sinews and bones, harmonizes blood vessels, benefits qi, and stops dysentery. Use after processing.
Wang Haogu (Haicang) states: It tonifies the insufficiency of Lung Metal Qi. It eliminates deficiency, sweet and warm to nourish blood. Produced in Dong'e, it is effective when processed with fire.
Bencao records: It governs internal bleeding in the heart and abdomen, extreme exhaustion, chills resembling malaria. Waist and abdominal pain, soreness and pain in the four limbs, uterine bleeding in women, calming the fetus, lower abdominal pain in men. Consumptive weakness and emaciation. Insufficiency of Yin Qi, foot pain, inability to stand for long periods. Nourishes Liver Qi, benefits Lung Qi. Extreme Lung deficiency with coughing up pus and blood; only Ejiao can tonify this. Zhang Zhongjing's Zhu Ling Tang uses Ejiao to lubricate and promote water passage. In the modification examples of Siwu Tang (Four Substance Decoction) from Huoren Shu, for vaginal bleeding during pregnancy, add Ejiao.
Qi is cold, taste is sweet.
Enters the Foot Shaoyin Kidney Meridian.
Cheng Wuji (Yi) states: Pig skin, taste is sweet, nature is cold. Pigs are aquatic animals, their qi enters the Kidney first. It resolves exogenous heat in the Shaoyin meridian; therefore, pig skin is used for this purpose, added with white honey to moisten dryness and eliminate irritability; added with rice flour to benefit qi and stop dysentery.
Qi is cold, taste is bitter and salty. Bitter, cold.
Cheng Wuji (Yi) states: In Zhang Zhongjing's Bai Tong Tang, adding this juice shares the salty-cold nature of human urine. Combined with hot agents, it removes the rejection of cold. Furthermore, combined with vinegar and inserted into the anus, sour and bitter nourish Yin, moistening dryness and unblocking bowels.
Shennong Bencao Jing states: Treats thirst due to heat from typhoid fever. Also: White pig trotters can be used; those mixed with blue-green color should not be eaten, nor used for treating diseases.
Wang Haogu (Haicang) states: It shares the same nature as human urine, tonifies the Liver and harmonizes Yin, guiding Yang without being rejected, entering the Heart to unblock vessels.
Taste is sweet. Toxic.
Bencao records: It governs ghost consumption (Gui Zhu), gu poison, removes fish bones stuck in the throat, and stops chronic cough. Burn to ash and take orally.
Treats recurrence of typhoid fever due to overexertion. Jing states: Male rat feces with pointed ends are used. Sometimes found left among various items in households.