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Fox Penis (Huli Jing) is indicated for women with infertility and pruritus vulvae, as well as pediatric testicular swelling and hydrocele.

The otter is an aquatic animal; its nature is cold, but its liver alone is warm. It has a salty taste and slight toxicity, entering the Liver and Kidney meridians. It specifically tonifies Yin Qi and treats deficiency injuries, ensuring that the Five Zang organs' spirits are tranquil in cases of extreme exhaustion, thereby naturally repelling Gui Zhu (Ghost Transmission, a contagious chronic wasting disease). The sweet and salty flavors are good at resolving toxicity, and saltiness can moisten and direct downwards, thus treating long-term abdominal pain due to parasites and Gu poison (Gu toxin). As stated in the *Classic* (*Huangdi Neijing*): "Where pathogenic factors gather, Zheng Qi (Upright Qi) must be deficient." Since Otter Liver excels at tonifying Yin and treating deficiency, and can also dispel Gu and drive out Zhu pathogens, it is a crucial herb for treating Chuan Shi Gu Zheng (Transmitted Corpse Bone Steaming, e.g., tuberculosis), evil Zhai diseases (Lao Zhai/Tuberculosis). Zhang Zhongjing and Cui Shi both used Otter Liver in treating various Lao diseases, often employing it as the Jun (Emperor) herb. Its ability to remove fish bones is merely a minor skill derived from the otter's fondness for fish.

Mountain Otter Penis has a sweet flavor and hot nature, with no toxicity. It treats Yang deficiency leading to impotence and cold sperm. This substance originates from Yizhou, Xidong, and Nandanzhou in Guangdong. Locals call it "Cha Qiao". Its nature is sexually toxic; if present in the mountains, all female beasts flee. If an otter lacks a mate, it embraces a tree until it dies. Yao women gather in groups during spring to collect this material. Upon smelling a woman's qi, an otter will leap and embrace her, inserting its penis deeply into the vagina where it becomes firmly stuck. People then strangle it, carry it back, and extract the penis. One piece is worth one tael of gold. If obtained from an otter that died embracing a tree, it is even more precious. Local Dong people treasure it highly; those who secretly trade it across borders face the death penalty. The method to test authenticity is: have a woman rub her hands until extremely hot, place the specimen in her palm, and breathe upon it. If it jumps or moves, it is genuine.

Otter Liver: While the otter's overall nature is cold, its liver alone is warm. Its liver differs from other livestock; it grows one leaf-like lobe each month, completing twelve lobes over a year, then gradually falls off and regenerates. It can be burned to powder and taken with wine, or roasted hot for consumption. It treats Zhu diseases and Chuan Shi (transmissible tuberculosis within a family), showing efficacy. It demonstrates special merit for postpartum labor fever and spontaneous sweating in all three seasons. It treats Qi-reversal coughing and is suitable for ingestion. It can dispatch Gui Du (Ghost Toxins) and plague. Cui Shi's formulas use it for Gu epidemics; Zhang Zhongjing uses it for Cold Lao (Cold Consumption); it removes fish bones stuck in the throat and reduces abdominal water distension.

According to Ge Hong: Shi Zhu (Corpse Transmission) and Gui Zhu (Ghost Transmission) cause alternating chills and fever, deep depression and silence, unknown suffering, and general malaise. Accumulating over months and years, it leads to death, and after death, it can infect others, potentially wiping out a household. Only by using Otter Liver dried in the shade and powdered, taken with water (2 qian per dose, three times daily), can worms be gradually expelled, with recovery as the goal. Its claws can also search out and eliminate Lao worms.