Ingredient Animal — secretion (动物分泌物 dòng wù fēn mì wù)

Sang Piao Xiao

Mantis egg case · 桑螵蛸

Tenodera sinensis Saussure / Statilia maculata (Thunberg) / Hierodula patellifera (Serville) · Ootheca Mantidis

Also known as: Sang Piao Xiao, Sang Piao Shao, Praying mantis egg case,

Sang Piao Xiao (Mantis egg case) plant

Images shown are for educational purposes only

Mantis egg case is a unique animal-derived substance used in Chinese medicine primarily to help the body control urination and retain its vital reserves. It is best known as a go-to remedy for bedwetting in children and frequent nighttime urination in older adults, and is also used for involuntary seminal loss. Its gentle, neutral nature means it rarely causes side effects, though it should be avoided if symptoms are caused by heat or inflammation rather than weakness.

Category Astringent / Stabilizing herbs (收涩药) Herbs that secure Essence and reduce urination (固精缩尿止带药)
Therapeutic focus Bladder Health Men's Reproductive Health Kidney Health Children's bedwetting

TCM Properties

Temperature

Neutral

Taste

Sweet (甘 gān), Salty (咸 xián)

Channels entered

Liver, Kidneys

Parts used

Animal — secretion (动物分泌物 dòng wù fēn mì wù)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Ingredient Does

Every ingredient has a specific set of actions — here's what Sang Piao Xiao does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Sang Piao Xiao is primarily used to support these areas of health:

Bladder Health Men's Reproductive Health Kidney Health Children's bedwetting

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Sang Piao Xiao performs to restore balance in the body:

Tonifies Kidney Yang Secures Essence and Stops Seminal Emission Secures Essence and Stops Enuresis Astringes to Stop Vaginal Discharge

How these actions work

'Tonifies the Kidneys and assists Yang' means Sāng Piāo Xiāo gently strengthens the Kidneys' warming and holding functions. In TCM, the Kidneys govern reproduction, urinary control, and the storage of Essence (the body's deep reserves). When these functions weaken, people may experience low back soreness, sexual dysfunction, or frequent urination. This herb provides a mild warming support to the Kidney Yang without being overly hot, making it suitable for cases of Kidney deficiency that are not complicated by excessive heat.

'Secures Essence and stops seminal emission' refers to the herb's ability to help the body hold onto its vital reserves. In TCM, the Kidneys are responsible for 'sealing' and storing Essence. When Kidney Qi is weak and cannot perform this holding function, involuntary loss of semen (during sleep or even while awake) can occur. Sāng Piāo Xiāo's sweet and salty tastes give it both tonifying and astringent properties, tightening the 'gate of Essence' so that these losses are controlled.

'Reduces urination and stops enuresis' means this herb strengthens the Bladder's ability to hold urine. Because the Bladder depends on Kidney Qi for its control, Kidney deficiency often leads to frequent urination, dribbling after urination, bedwetting in children, or urinary incontinence in older adults. Sāng Piāo Xiāo is considered one of the most important herbs specifically for bedwetting and is frequently combined with other astringent herbs to reinforce this effect.

'Stops vaginal discharge' applies when Kidney deficiency leads to a failure to contain fluids in the lower body, resulting in chronic clear or white vaginal discharge. This action follows from the same underlying mechanism of strengthening the Kidneys' ability to hold and control body fluids.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Sang Piao Xiao is used to help correct these specific patterns.

Why Sang Piao Xiao addresses this pattern

When Kidney Qi is insufficient and cannot perform its holding and storing functions, the body loses control over urination and Essence retention. Sāng Piāo Xiāo directly addresses this pattern through its sweet and salty tastes, which tonify the Kidneys while simultaneously providing an astringent, binding quality. It enters the Kidney channel and gently supports Kidney Yang, strengthening the 'gate of Essence' (精关 jīng guān) so the Kidneys can properly seal and store. This makes it a primary herb for the core symptoms of this pattern: involuntary loss of urine and semen.

A practitioner would look for one or more of these signs

Frequent Urination

Frequent, clear urination especially at night

Urinary Incontinence

Inability to fully control urination

Nocturnal Emission

Involuntary seminal emission during sleep

Lower Back Pain

Soreness and weakness of the lower back and knees

Commonly Used For

These are conditions where Sang Piao Xiao is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Kidney Qi not Firm Heart and Kidney not communicating

TCM Interpretation

In TCM, bedwetting in children is primarily understood as a result of the Kidneys not yet being fully developed. The Kidneys govern the Bladder's ability to hold urine, and in children, this function is inherently immature. When combined with constitutional weakness, fear, or overtiredness, the Kidney Qi cannot maintain its 'sealing' function during sleep, and urine escapes involuntarily. In some cases, the Heart-Kidney connection is also involved, particularly when the child is anxious, fearful, or has disturbed sleep. Adult enuresis follows similar principles but is usually attributed to the gradual decline of Kidney Qi with age or illness.

Why Sang Piao Xiao Helps

Sāng Piāo Xiāo is historically regarded as one of the single most important herbs for treating bedwetting. Its sweet and salty tastes directly tonify and astringe the Kidney Qi, strengthening the Bladder's holding function. Its neutral temperature makes it safe for children without risk of generating excess heat. The classical formula Sāng Piāo Xiāo Sǎn, where this herb serves as the King ingredient, was specifically designed for this condition and has been validated in modern clinical studies showing efficacy rates above 95% for pediatric enuresis.

Also commonly used for

Urinary Incontinence

Stress incontinence, postpartum urinary leakage

Nocturnal Emission

Spermatorrhea and involuntary seminal loss

Premature Ejaculation
Impotence

Erectile dysfunction from Kidney Yang deficiency

Leukorrhea

Chronic white vaginal discharge from Kidney deficiency

Benign Prostatic Hypertrophy

Used in formulas for prostate-related urinary symptoms

Overactive Bladder

Bladder hyperactivity with urgency and frequency

Ingredient Properties

Every ingredient has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Neutral

Taste

Sweet (甘 gān), Salty (咸 xián)

Channels Entered

Liver Kidneys

Parts Used

Animal — secretion (动物分泌物 dòng wù fēn mì wù)

Dosage & Preparation

These are general dosage guidelines for Sang Piao Xiao — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

5–10g

Maximum dosage

Up to 15g per day in acute cases of urinary incontinence, for short-term use under practitioner supervision. Standard doses of 5–10g should not be exceeded for routine use.

Dosage notes

Use the standard range of 5–10g for most indications including seminal emission, urinary frequency, and enuresis. When taken as ground powder rather than decoction, 3–5g is the typical dose. Salt-prepared (盐炒) Sang Piao Xiao is preferred for Kidney-focused applications, as salt processing guides the herb's action into the Kidney channel and enhances its astringent effect. For children with bedwetting, 3–5g is typical, and the herb can be used alone as a powder taken with rice water.

Preparation

Raw Sang Piao Xiao must be steamed before use to kill the developing mantis nymphs inside the egg case and to eliminate the diarrhea-causing effect of the unprocessed material. After collection, the egg cases are cleaned of debris, steamed for approximately one hour, then dried. This is the minimum required processing. They should be cut or broken into pieces before adding to a decoction.

Processing Methods

In TCM, the same ingredient can be prepared in different ways to change its effects — here's how processing alters what Sang Piao Xiao does

Processing method

The raw egg cases are cleaned of debris, placed in a steamer, and steamed for approximately one hour to kill the developing insect eggs inside, then dried.

How it changes properties

Steaming is the standard baseline processing. Raw, unprocessed egg cases can cause diarrhea (as noted in the Míng Yī Bié Lù). Steaming eliminates this laxative side effect while preserving the herb's core astringent and tonifying properties. The temperature, taste, and channel entry remain unchanged.

When to use this form

This is the standard form used in most prescriptions. Virtually all commercially available Sāng Piāo Xiāo has been steamed as a minimum processing step.

Common Ingredient Pairs

These ingredients are traditionally combined with Sang Piao Xiao for enhanced therapeutic effect

Long Gu
Long Gu 1:1 (Sang Piao Xiao 10g : Long Gu 10g)

Sāng Piāo Xiāo tonifies the Kidneys and astringes Essence, while Lóng Gǔ (fossilized bone) calms the spirit and provides powerful astringent action. Together, they reinforce each other's binding qualities: the Kidney-tonifying effect of Sāng Piāo Xiāo addresses the root deficiency, while Lóng Gǔ's heavy, settling nature anchors the spirit and tightens the gate of Essence. This is the core pairing in Sāng Piāo Xiāo Sǎn.

When to use: Seminal emission (especially with dream-disturbed sleep), urinary incontinence with mental restlessness or forgetfulness, bedwetting in anxious children.

Yi Zhi Ren
Yi Zhi Ren 1:1 (Sang Piao Xiao 10g : Yi Zhi Ren 10g)

Both herbs warm and tonify the lower body and astringe urine. Sāng Piāo Xiāo focuses on Kidney tonification and securing Essence, while Yì Zhì Rén adds Spleen-warming action and a stronger warming quality. Together they create a comprehensive approach to lower body Deficiency Cold affecting both urination and digestion.

When to use: Nocturia and urinary frequency in elderly patients with Kidney Yang deficiency, childhood enuresis with underlying cold constitution, dribbling after urination.

Jin Ying Zi
Jin Ying Zi 1:1 (Sang Piao Xiao 10-15g : Jin Ying Zi 10-15g)

Sāng Piāo Xiāo tonifies Kidney Yang and binds Essence, while Jīn Yīng Zǐ (Cherokee rose fruit) provides strong sour astringency. The combination strengthens both the tonifying and the astringent aspects, where Sāng Piāo Xiāo treats the underlying deficiency and Jīn Yīng Zǐ directly controls leakage.

When to use: Spermatorrhea, urinary incontinence in the elderly, chronic clear vaginal discharge, nocturia that has not responded to milder approaches.

Tu Si Zi
Tu Si Zi 1:1 (Sang Piao Xiao 10g : Tu Si Zi 10g)

Tú Sī Zǐ (cuscuta seed) tonifies both Kidney Yin and Yang and secures Essence, while Sāng Piāo Xiāo adds stronger astringent and Yang-assisting action. The combination nourishes and secures the Kidneys from multiple angles, treating both the deficiency and the leakage of Essence.

When to use: Spermatorrhea and premature ejaculation from Kidney deficiency, impotence with lower back soreness, urinary frequency with reproductive complaints.

Key Formulas

These well-known formulas feature Sang Piao Xiao in a prominent role

Sang Piao Xiao San 桑螵蛸散 King

The definitive formula for this herb. Sāng Piāo Xiāo serves as the King ingredient, directly showcasing its core actions of tonifying the Kidneys, securing Essence, and reducing urination. The formula, from the Běn Cǎo Yǎn Yì (1116 CE), pairs this herb with spirit-calming and Heart-nourishing ingredients to treat the combined Heart-Kidney deficiency pattern, making it the classic prescription for childhood bedwetting, urinary frequency, and spermatorrhea with forgetfulness.

Tu Si Zi Wan 菟絲子丸 Assistant

In this Kidney Yang-tonifying formula, Sāng Piāo Xiāo assists the main herbs (Tú Sī Zǐ, Fù Zǐ, Lù Róng) by adding astringent action to secure Essence and reduce urination. This demonstrates its role as a supporting astringent within broader Kidney-warming prescriptions for impotence, spermatorrhea, and lower back weakness.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Hai Piao Xiao
Sang Piao Xiao vs Hai Piao Xiao

Despite similar-sounding names, these are completely different substances. Hǎi Piāo Xiāo (cuttlefish bone) is salty, astringent, and slightly warm; it excels at stopping bleeding, controlling vaginal discharge, neutralizing stomach acid, and healing ulcers externally. Sāng Piāo Xiāo (mantis egg case) is sweet, salty, and neutral; it excels at tonifying the Kidneys, assisting Yang, and astringeing both urine and Essence. While both can treat spermatorrhea and vaginal discharge through Kidney-channel astringency, Hǎi Piāo Xiāo does not tonify, while Sāng Piāo Xiāo does not stop bleeding or treat stomach acid.

Fu Pen Zi
Sang Piao Xiao vs Fu Pen Zi

Both tonify the Kidneys and astringe Essence, treating enuresis, urinary frequency, spermatorrhea, and impotence. However, Fù Pén Zǐ (raspberry fruit) is sweet, sour, and slightly warm, and more strongly enriches Kidney Yin. Sāng Piāo Xiāo is sweet, salty, and neutral, and more strongly reinforces Kidney Yang. Choose Fù Pén Zǐ when there are concurrent Yin deficiency signs; choose Sāng Piāo Xiāo when Yang deficiency and poor bladder control are the dominant features.

Yi Zhi Ren
Sang Piao Xiao vs Yi Zhi Ren

Both warm and astringe the lower body, treating urinary frequency and enuresis. Yì Zhì Rén (Alpinia fruit) is acrid and warm, entering the Spleen and Kidney channels, and additionally warms the Spleen to stop diarrhea and control drooling. Sāng Piāo Xiāo is neutral and enters the Liver and Kidney channels, focusing more specifically on securing Essence and stopping seminal emission. Yì Zhì Rén is better when Spleen Cold accompanies urinary symptoms; Sāng Piāo Xiāo is better when Kidney deficiency with spermatorrhea or impotence is the main concern.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Sang Piao Xiao

The most common source of confusion is between Sang Piao Xiao (桑螵蛸, mantis egg case) and Hai Piao Xiao (海螵蛸, cuttlefish bone). Despite their similar names, these are completely different substances with distinct therapeutic actions: Sang Piao Xiao tonifies Kidney Yang and astringes essence and urine, while Hai Piao Xiao stops bleeding, controls acidity, and dries Dampness. They must never be substituted for each other. Another quality concern is species authenticity. The Chinese Pharmacopoeia recognizes only three mantis species as official sources, but commercial products frequently contain egg cases from other mantis species, which may have different pharmacological profiles. DNA barcoding studies have confirmed widespread species confusion in the marketplace. Additionally, egg cases collected from trees other than mulberry are considered inferior to authentic mulberry-branch specimens, though all mantis oothecae are used in practice.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any ingredient.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Sang Piao Xiao

Non-toxic

Sang Piao Xiao is classified as non-toxic in classical sources. The Wu Pu Ben Cao explicitly states it has no toxicity (无毒), and the Shen Nong Ben Cao Jing lists it as an upper-grade herb. No significant toxic components have been identified. The main safety concern is not toxicity but rather its warming, Yang-supporting nature, which can aggravate Yin-deficient or Heat patterns if used inappropriately. The raw, unprocessed egg case can cause diarrhea, which is why classical texts universally require steaming or dry-roasting before internal use. Proper processing eliminates this effect.

Contraindications

Situations where Sang Piao Xiao should not be used or requires extra caution

Caution

Yin deficiency with vigorous Fire (阴虚火旺). The Ben Jing Feng Yuan warns that if used by mistake in persons with Yin deficiency and excessive Fire, it can paradoxically fuel deficiency-Yang, leading to painful, burning urination and worsened seminal loss.

Caution

Damp-Heat in the Bladder or Lower Jiao. When frequent urination or urinary urgency is caused by Damp-Heat rather than Kidney deficiency, Sang Piao Xiao's astringent and Yang-supporting nature will trap the pathogen and worsen symptoms.

Caution

Excess Fire patterns causing seminal emission or urinary frequency. The Ben Cao Jing Shu states that when seminal loss or frequent urination stems from excessive Fire, this herb should be used sparingly or avoided.

Classical Incompatibilities

Traditional Chinese pharmacological incompatibilities — herbs or substances to avoid combining with Sang Piao Xiao

Sang Piao Xiao does not appear on the Eighteen Incompatibilities (十八反) or Nineteen Mutual Fears (十九畏) lists. However, classical sources note the following: - Ben Cao Jing Ji Zhu (《本草经集注》): "Fears" (畏) Xuan Fu Hua (旋复花, Inula flower) - Yao Xing Lun (《药性论》): "Fears" (畏) Dai Shen (戴椹) These are traditional precautions from individual texts rather than the standardized incompatibility lists.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Classical texts record Sang Piao Xiao being used during pregnancy specifically for frequent urination and urinary incontinence. The Chan Shu Fang (《产书方》) describes using 12 egg cases ground to powder and taken with rice water to treat pregnancy-related urinary frequency. Based on its neutral thermal nature and non-toxic classification, it is not considered contraindicated in pregnancy at standard doses when used appropriately under practitioner guidance. However, its astringent nature means it should only be used when there is a clear deficiency pattern, not for urinary symptoms caused by other mechanisms.

Breastfeeding

No specific classical or modern contraindications for breastfeeding have been documented. Classical texts record use of Sang Piao Xiao in postpartum formulas for urinary incontinence, suggesting it was considered compatible with the postpartum and lactating period. It is classified as non-toxic and neutral in thermal nature. As always, use should be under practitioner supervision and limited to appropriate deficiency patterns.

Children

Sang Piao Xiao has been traditionally regarded as one of the most important herbs for treating childhood bedwetting (enuresis). Classical sources describe using it as a single herb, ground to powder and taken with rice water, for pediatric enuresis. A clinical report describes using Sang Piao Xiao with Yi Zhi Ren, decocted, with reduced doses for children aged 5–12 (approximately one-third of adult dose). Dosages for children are typically 3–5g in decoction, adjusted by age and body weight. The herb is considered gentle and non-toxic, making it suitable for pediatric use under practitioner guidance.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Sang Piao Xiao

No well-documented pharmaceutical drug interactions have been established for Sang Piao Xiao. Its main active constituents include phospholipids, proteins, amino acids, calcium carbonate, and trace minerals, which are generally considered to have low interaction potential.

As a theoretical precaution, because Sang Piao Xiao has antidiuretic properties (reducing urinary output), it could theoretically interact with diuretic medications by opposing their effect. Practitioners should be aware of this possibility in patients taking diuretics for conditions such as hypertension or edema.

Dietary Advice

Foods and dietary considerations when taking Sang Piao Xiao

While taking Sang Piao Xiao for Kidney deficiency and urinary problems, it is advisable to avoid cold and raw foods, excessive caffeine, and alcohol, as these can burden the Kidney and Bladder and counteract the herb's warming and astringent effects. Warm, nourishing foods that support the Kidney (such as black sesame, walnuts, and lamb) are complementary. Avoid overly salty foods in large amounts, as excess salt can strain the Kidneys despite the herb's own salty flavor being therapeutic at medicinal doses.

Botanical Description

Physical characteristics and morphology of the Sang Piao Xiao source animal

Sang Piao Xiao is not a plant but rather the dried egg case (ootheca) of praying mantis species. The three official source species recognized by the Chinese Pharmacopoeia are the Chinese mantis (Tenodera sinensis), the small mantis (Statilia maculata), and the giant axe mantis (Hierodula patellifera). These produce three commercially distinct forms known respectively as Tuan Piao Xiao (团螵蛸, round egg case), Chang Piao Xiao (长螵蛸, long egg case), and Hei Piao Xiao (黑螵蛸, black egg case).

Female mantises secrete a foamy material onto twigs in late summer and autumn, which hardens into a protective casing sheltering dozens to hundreds of eggs through winter. The medicinally preferred egg cases are those found on mulberry (Morus alba) branches, as classical theory holds that the egg case absorbs beneficial properties from the mulberry bark. The name "Sang" (桑) means mulberry, and "Piao Xiao" (螵蛸) refers to the mantis egg case.

The round form (Tuan Piao Xiao) is roughly cylindrical or semi-circular, 2.5–4 cm long and 2–3 cm wide, made of layered membranous sheets, pale yellowish-brown on the surface. The cross-section reveals a spongy outer layer and an inner layer of tiny chambers arranged radially, each containing a small, dark brown, glossy egg.

Sourcing & Harvesting

Where Sang Piao Xiao is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Late autumn through early spring (after first frost until before hatching in spring), traditionally from after the Start of Winter (立冬) through the Awakening of Insects (惊蛰) solar term.

Primary growing regions

Sang Piao Xiao is collected across much of China, as praying mantises are widespread. The three official source species have different distributions: - Tenodera sinensis (Tuan Piao Xiao): Guangxi, Yunnan, Hubei, Hunan, Hebei, Liaoning, Henan, Shandong, Jiangsu, Inner Mongolia, Sichuan - Statilia maculata (Chang Piao Xiao): Zhejiang, Jiangsu, Anhui, Shandong, Hubei - Hierodula patellifera (Hei Piao Xiao): Hebei, Shandong, Henan, Shanxi The best quality is traditionally considered to come from egg cases found on mulberry trees, as classical texts note that these absorb the beneficial properties of mulberry bark. Shandong and Hebei provinces are among the most important commercial collection areas.

Quality indicators

Good quality Sang Piao Xiao should be: - Intact and complete, with no holes from insect damage or hatching - Lightweight but firm and resilient (not crumbly or powdery) - Pale yellowish-brown in color (for Tuan Piao Xiao, the most common type) - Cross-section showing a clear spongy outer layer and organized radial inner chambers containing small, dark brown, glossy eggs - Slightly fishy smell (微腥), bland or slightly salty taste - Still attached to or showing marks from mulberry twigs (桑枝) for the highest grade - Free of mold, insect infestation, or dark discoloration Avoid specimens that are hollow, crumbled, have hatched (empty chambers), show pest contamination, or come from non-mulberry sources.

Classical Texts

Key passages from the classical Chinese medical texts that describe Sang Piao Xiao and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

Original: 桑螵蛸，味咸平。主伤中，疝瘕，阴痿，益精生子，女子血闭，腰痛，通五淋，利小便水道。

Translation: Sang Piao Xiao is salty and neutral. It treats internal injury, mounting conglomeration, and impotence. It enriches essence and promotes fertility. For women, it treats amenorrhea and lower back pain. It opens the five types of painful urination and facilitates the urinary waterways.

Ming Yi Bie Lu (《名医别录》)

Original: 疗男子虚损，五脏气微，梦寐失精，遗溺。

Translation: It treats men's deficiency-taxation, when the Qi of the five organs is feeble, nocturnal seminal emission during dreams, and urinary incontinence.

Bie Lu (《别录》) — on processing

Original: 桑螵蛸当火炙，不尔令人泄。

Translation: Sang Piao Xiao should be dry-roasted over fire; otherwise it causes diarrhea.

Ben Jing Feng Yuan (《本经逢原》)

Original: 桑螵蛸，肝肾命门药也。功专收涩，故男子虚损，肾虚阳痿，梦中失精，遗溺白浊方多用之。《本经》又言通五淋，利小便水道，盖取以泄下焦虚滞也。阴虚多火人误用，反助虚阳，多致溲赤茎痛，强中失精，不可不知。

Translation: Sang Piao Xiao is a medicinal for the Liver, Kidney, and Gate of Vitality. Its specialty is astringent binding; hence it is widely used for men's deficiency-taxation, Kidney deficiency impotence, nocturnal emissions, and turbid urination. The Ben Jing also says it opens the five painful urinary conditions and facilitates urination, meaning it drains stagnation from the Lower Jiao. If mistakenly used by someone with Yin deficiency and excess Fire, it paradoxically fuels deficiency-Yang, often causing painful red urination and worsened seminal loss — this must be known.

Yao Xing Lun (《药性论》)

Original: 主男子肾衰漏精，精自出，患虚冷者能止之。止小便利，火炮令热，空心食之。

Translation: It treats men's Kidney decline with leaking essence and spontaneous seminal loss; for those suffering from deficiency-Cold, it can stop this. It checks excessive urination. Dry-roast it until warm, and take on an empty stomach.

Historical Context

The history and evolution of Sang Piao Xiao's use in Chinese medicine over the centuries

Sang Piao Xiao has one of the oldest documented histories of any insect-derived medicine. It was first recorded in the Shen Nong Ben Cao Jing (circa 100 AD), where it was classified as an upper-grade (上品) medicinal, indicating it was considered non-toxic and suitable for long-term use. Its early inclusion likely arose because the mulberry tree was deeply revered in ancient China as the host plant for silkworms, and virtually every part of the mulberry was used medicinally. Egg cases found on mulberry branches were naturally collected and tested as medicine.

The name itself is telling: "Sang" (桑) means mulberry, emphasizing that only egg cases from mulberry trees were considered authentic. The early commentator Tao Hongjing (陶弘景, Southern dynasties) wrote that egg cases from mulberry were superior because they "absorb the vital essence of mulberry bark." This reflects the classical concept that the host substrate influences the medicinal quality of a substance.

Over time, the herb's uses narrowed. The Shen Nong Ben Cao Jing described broad applications including hernial masses, impotence, amenorrhea, and urinary disorders. By the Song and later dynasties, its use became increasingly focused on its astringent properties for treating seminal emission and urinary incontinence. The famous formula Sang Piao Xiao San, recorded in the Ben Cao Yan Yi (《本草衍义》, 1116 AD), exemplifies a sophisticated "mind-body" approach by combining Sang Piao Xiao with spirit-calming herbs to treat the Heart-Kidney axis. This formula treats not just the urinary symptoms but also the mental-emotional dimension of forgetfulness, restlessness, and poor concentration.

Modern Research

2 published studies investigating the pharmacological effects or clinical outcomes of Sang Piao Xiao

1

Mantidis ootheca induces vascular relaxation through PI3K/AKT-mediated nitric oxide-cyclic GMP-protein kinase G signaling in endothelial cells (in vitro study, 2017)

Journal article indexed in PubMed, 2017

This laboratory study investigated how an aqueous extract of mantis egg case affects blood vessels. The extract induced relaxation in isolated rat aortic rings and increased nitric oxide production in human endothelial cells via the PI3K/Akt/eNOS signaling pathway. This suggests a potential mechanism for cardiovascular effects, though clinical significance remains to be established.

PubMed
2

Mantidis Oötheca (mantis egg case) original species identification via morphological analysis and DNA barcoding (analytical study, 2020)

Song J-H, Cha J-M, Moon BC, Kim WJ, Yang S, Choi G. Journal of Ethnopharmacology, 2020, 252, 112574

This study developed DNA barcoding methods to accurately identify the species of origin of commercial Sang Piao Xiao products. It found that morphological identification alone is unreliable, and that non-pharmacopoeia species are sometimes sold as authentic product, highlighting quality control concerns in the market.

PubMed

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.