Herb Peel / Rind (皮 pí / 果皮 guǒ pí)

Shi Liu Pi

Pomegranate rind · 石榴皮

Punica granatum L. · Pericarpium Granati

Also known as: Shi Liu Ke (石榴壳)

Shi Liu Pi (Pomegranate rind) plant

Images shown are for educational purposes only

Pomegranate rind is a strongly astringent herb used primarily for chronic diarrhea and dysentery that has persisted for a long time. It also helps stop bleeding, control excessive vaginal discharge, and has traditional uses against intestinal parasites like tapeworms. It should not be used during the early stages of diarrhea or dysentery, as it works by binding the intestines rather than addressing the root cause of infection.

Category Astringent / Stabilizing herbs (收涩药) Herbs that astringe the Lungs and bind the intestines (敛肺涩肠药)
Therapeutic focus Digestive Health Chronic Diarrhea Bleeding Disorders Parasite Management

TCM Properties

Temperature

Warm

Taste

Sour (酸 suān), Astringent (涩 sè), Bitter (苦 kǔ)

Channels entered

Large Intestine, Kidneys

Parts used

Peel / Rind (皮 pí / 果皮 guǒ pí)

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What This Herb Does

Every herb has a specific set of actions — here's what Shi Liu Pi does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Shi Liu Pi is primarily used to support these areas of health:

Digestive Health Chronic Diarrhea Bleeding Disorders Parasite Management

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Shi Liu Pi performs to restore balance in the body:

Astringes the Intestines and Stops Diarrhea Stops Bleeding Expels Parasites Tonifies the Kidneys and Secures Essence Astringes to Stop Vaginal Discharge

How these actions work

'Astringes the intestines and stops diarrhea' is the primary action of Shí Liú Pí. Its strongly sour and astringent taste gives it a powerful binding effect on the Large Intestine. This makes it especially useful for chronic, long-standing diarrhea or dysentery that has gone on for weeks or months, where the intestines have become slack and can no longer hold contents properly. It is not appropriate for the early stages of diarrhea when the pathogen still needs to be expelled.

'Stops bleeding' refers to its ability to restrain bleeding through astringency. This applies to blood in the stool, uterine bleeding (including heavy periods and bleeding during pregnancy), and other types of bleeding caused by the body's inability to hold Blood in the vessels. The charcoal-processed form (Shí Liú Pí Tàn) is preferred when the primary goal is stopping bleeding.

'Kills parasites and expels worms' refers to its traditional use against intestinal parasites, particularly tapeworms and roundworms. The rind contains alkaloids that have a paralysing effect on intestinal worms, making it a historically important antiparasitic remedy, often combined with Bīng Láng (betel nut).

'Stabilizes the Kidneys and retains essence' means it helps the body hold onto substances that should not leak out, such as semen. In TCM, the Kidneys govern the storage of essence. When Kidney function weakens, involuntary loss of semen (spermatorrhea) or excessive vaginal discharge can occur. Shí Liú Pí's astringent nature helps tighten these 'gates' and prevent leakage.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Shi Liu Pi is used to help correct these specific patterns.

Why Shi Liu Pi addresses this pattern

When both Spleen and Kidney Yang are deficient, the body loses its ability to transform and hold fluids in the intestines, resulting in chronic watery diarrhea, sometimes with rectal prolapse. Shí Liú Pí's warm temperature and strongly astringent, sour taste directly counter the slippery, uncontrolled discharge characteristic of this pattern. By entering the Large Intestine and Kidney channels, it binds the intestines to stop diarrhea while also stabilizing the Kidney's 'gate' function. However, as an astringent herb it only addresses the symptom of leakage and must be combined with Yang-warming herbs like Gān Jiāng and Fù Zǐ to treat the root deficiency.

A practitioner would look for one or more of these signs

Chronic Diarrhea

Chronic watery diarrhea, especially early morning or dawn diarrhea

Rectal Prolapse

Rectal prolapse from prolonged diarrhea

Cold Limbs

Cold extremities and aversion to cold

Eye Fatigue

Fatigue and weakness

Commonly Used For

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

Arises from: Spleen and Kidney Qi Deficiency Damp-Heat in the Large Intestine

TCM Interpretation

In TCM, chronic diarrhea is understood as a failure of the Spleen to properly transform and transport fluids, often compounded by Kidney Yang weakness that leaves the body unable to 'hold' its contents. The Large Intestine, which depends on Spleen and Kidney support, becomes slack and loses its ability to absorb fluids and form solid stools. When diarrhea persists for weeks or months, it further depletes Qi and Yang, creating a vicious cycle. In some cases, lingering Damp-Heat continues to irritate the intestines even as the overall constitution weakens.

Why Shi Liu Pi Helps

Shí Liú Pí directly enters the Large Intestine channel with a powerfully astringent, sour taste that 'binds' the intestines, reducing the excessive fluid discharge and restoring the intestine's holding function. Its warm temperature supports the deficient Yang that often underlies chronic diarrhea. Modern studies on pomegranate rind decoctions used for bacterial dysentery showed high cure rates, with symptoms resolving within days. The herb's tannin content produces a direct tightening effect on intestinal mucosa, reducing secretions. However, it must be combined with herbs that address the root cause (such as Spleen Qi or Kidney Yang tonics) because it treats the symptom of leakage, not the underlying deficiency.

Also commonly used for

Rectal Prolapse

From chronic diarrhea or dysentery, often used as a wash

Bleeding

Intestinal bleeding, bloody stool, uterine bleeding

Thin Vaginal Discharge

Chronic white or watery vaginal discharge from Spleen/Kidney deficiency

Spermatorrhea

Involuntary seminal emission from Kidney insecurity

Intestinal Parasites

Tapeworms, roundworms, and associated abdominal pain

Ulcerative Colitis

Used in formulas for chronic inflammatory bowel conditions

Bleeding

Functional uterine bleeding and menorrhagia

Herb Properties

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

Temperature

Warm

Taste

Sour (酸 suān), Astringent (涩 sè), Bitter (苦 kǔ)

Channels Entered

Large Intestine Kidneys

Parts Used

Peel / Rind (皮 pí / 果皮 guǒ pí)

Dosage & Preparation

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

Standard dosage

3-10g

Maximum dosage

Up to 15g in decoction for stubborn chronic diarrhea or parasitic infections, under practitioner supervision. Do not exceed this range due to slight toxicity of pomegranate alkaloids.

Dosage notes

Use lower doses (3-6g) for mild chronic diarrhea and as an intestinal astringent. Use higher doses (6-10g) for chronic dysentery, parasitic infections, and significant bleeding conditions. When used as a powder (ground and taken directly rather than decocted), the dose is much lower: 0.5-1g per dose. For external use (skin conditions, wounds, ear infections), no strict internal dosage limit applies. The charcoal-processed form (Shi Liu Pi Tan) has enhanced astringent power and is preferred for severe chronic diarrhea, chronic dysentery, and uterine bleeding.

Preparation

The classical text Lei Gong Pao Zhi Lun specifies that pomegranate rind, leaves, and root must not come into contact with iron during preparation (勿令犯铁), because the high tannin content reacts with iron to form undesirable dark compounds. Use ceramic, glass, or enamel vessels for decoction.

Processing Methods

In TCM, the same herb can be prepared in different ways to change its effects — here's how processing alters what Shi Liu Pi does

Processing method

Stir-fry clean Shi Liu Pi pieces using the charcoal method (炒炭法) until the outer surface is black-yellow and the interior is brown. The pieces should retain their shape and not be fully carbonized.

How it changes properties

Charring enhances the herb's hemostatic (blood-stopping) action while moderating its other properties. The astringent effect becomes more focused on stopping bleeding rather than binding the intestines. The warmth is preserved but the antiparasitic alkaloids are partly degraded.

When to use this form

Choose the charcoal form when the primary treatment goal is stopping bleeding, such as bloody stool, uterine bleeding, or bleeding during pregnancy. The raw (unprocessed) form is preferred for diarrhea, dysentery, and parasites.

Common Herb Pairs

These ingredients are traditionally combined with Shi Liu Pi for enhanced therapeutic effect

Bing Lang
Bing Lang 1:1 (equal parts, ground to powder)

Bīng Láng (betel nut) is bitter, acrid, and warm, while Shí Liú Pí is sour, astringent, and warm. Both enter the Large Intestine channel. Together they create an ideal antiparasitic combination: the sour taste calms the parasites, the acrid taste subdues them, and the bitter taste drives them downward and out. This is considered one of the most effective classical pairs for expelling roundworms and tapeworms.

When to use: Intestinal parasitic infections, particularly tapeworm and roundworm infestations with abdominal pain, nausea, or visible worms in stool.

Huang Lian
Huang Lian Huang Lian 6g : Shi Liu Pi 10g

Huáng Lián clears Heat and dries Dampness in the Large Intestine, while Shí Liú Pí astringes the intestines to stop diarrhea. Together they address chronic dysentery where residual Damp-Heat persists alongside intestinal weakness, achieving simultaneous clearing and binding that neither herb could accomplish alone.

When to use: Chronic dysentery or diarrhea with blood and mucus in stool, where Damp-Heat has not fully resolved but the intestines are already weakened.

Rou Dou Kou
Rou Dou Kou 1:1

Both herbs astringe the intestines, but Ròu Dòu Kòu (nutmeg) warms the Middle Burner and moves Qi to address the cold and stagnation behind chronic diarrhea, while Shí Liú Pí provides stronger astringent binding. Together they warm and bind the intestines more powerfully than either alone.

When to use: Chronic cold-type diarrhea with watery stools, poor appetite, and cold abdomen, where the Spleen Yang is deficient.

He Zi
He Zi 1:1

Both Hē Zǐ (chebula fruit) and Shí Liú Pí are sour, astringent herbs that bind the intestines. Combined, they reinforce each other's intestine-tightening effect. Hē Zǐ also descends Lung Qi and benefits the throat, adding a mild Lung-astringent dimension to the pair.

When to use: Severe chronic diarrhea or dysentery that has not responded to a single astringent herb alone.

Comparable Ingredients

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

He Zi
Shi Liu Pi vs He Zi

Both Hē Zǐ (Fructus Chebulae) and Shí Liú Pí astringe the intestines to stop chronic diarrhea. The key difference is that Hē Zǐ also astringes the Lungs to stop coughing and benefits the throat to restore the voice, making it more versatile for conditions involving both Lung and intestinal leakage. Shí Liú Pí has stronger antiparasitic action and is the preferred choice when intestinal parasites are also present.

Rou Dou Kou
Shi Liu Pi vs Rou Dou Kou

Ròu Dòu Kòu (nutmeg) and Shí Liú Pí both astringe the intestines for chronic diarrhea. Ròu Dòu Kòu is more warming to the Middle Burner and better at moving stagnant Qi, making it preferred when cold and Qi stagnation are prominent (bloating, undigested food in stools). Shí Liú Pí has stronger astringent power and additional actions of stopping bleeding and killing parasites.

Wu Mei
Shi Liu Pi vs Wu Mei

Wū Méi (smoked plum) is also sour and astringent and can bind the intestines, but its range is much broader: it generates fluids, calms roundworms, and stops cough. Wū Méi is neutral to slightly warm, while Shí Liú Pí is definitively warm. For pure intestinal astringency, Shí Liú Pí is more focused and powerful. For roundworm-related abdominal pain with mixed cold-heat, Wū Méi is preferred (as in Wū Méi Wán).

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Shi Liu Pi

Shi Liu Pi (pomegranate fruit rind) must be distinguished from Shi Liu Gen Pi (石榴根皮, pomegranate root bark). The root bark has significantly higher alkaloid content and is classified as toxic (有毒) rather than slightly toxic. Root bark is primarily used for killing intestinal parasites, especially tapeworms, and has a narrower safety margin. The two should never be confused or substituted. Additionally, the sour variety (酸石榴皮) is the standard medicinal form. Sweet pomegranate rind is considered inferior for medicinal use. Classical sources note that rind from old trees, aged and stored for some time, is superior to freshly harvested material from young trees.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Shi Liu Pi

Slightly toxic

Shi Liu Pi contains pomegranate peel alkaloids (石榴皮碱, isopelletierine and related compounds) that can be toxic in excessive doses. Symptoms of toxicity include fever, dizziness, blurred vision, nausea, vomiting, and a crawling sensation on the skin. In severe cases, calf muscle spasms, generalized convulsions, and collapse may occur. The fruit rind is classified as slightly toxic (小毒), which is much less toxic than the root bark (石榴根皮), which has a higher alkaloid content and is classified as toxic. At standard therapeutic doses (3 to 10g in decoction), the fruit rind is considered safe. The high tannin content can cause gastrointestinal discomfort if taken on an empty stomach or in excessive amounts. The classical instruction to avoid contact with iron vessels during preparation (勿令犯铁) is chemically sound, as the tannins react with iron to form undesirable compounds.

Contraindications

Situations where Shi Liu Pi should not be used or requires extra caution

Avoid

Active dysentery or diarrhea with retained pathogenic factors (痢积未尽). The classical text Ben Cao Cong Xin warns that using Shi Liu Pi too early when pathogenic accumulation has not yet been cleared will trap the pathogen inside, worsening the condition. This astringent herb should only be used after the acute pathogenic phase has resolved.

Avoid

Constipation of any type. As a strongly astringent herb, Shi Liu Pi will further bind the intestines and worsen constipation.

Avoid

Acute damp-heat dysentery in the initial stages. The astringent nature of Shi Liu Pi will retain damp-heat pathogens in the intestines, potentially prolonging or worsening the illness. Wait until the pathogen has been substantially cleared before introducing this herb.

Caution

Exterior patterns (common cold or flu) that have not yet resolved. Using astringent herbs during active exterior conditions may trap the pathogen inside the body.

Caution

Excessive dosage. Shi Liu Pi is classified as slightly toxic. Overdose can cause nausea, vomiting, dizziness, blurred vision, and in severe cases, calf muscle spasms and generalized convulsions.

Caution

Patients with significant Yin deficiency or internal dryness should use with caution, as the warm and astringent nature may aggravate dryness.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Use with caution during pregnancy. While Shi Liu Pi is classified as only slightly toxic at standard doses, it contains alkaloids (isopelletierine and related compounds) that could potentially affect the fetus. Interestingly, one classical formula (Shi Liu Pi Tang from the Chan Jing Fang) actually uses pomegranate rind with Dang Gui, E Jiao, and Ai Ye for sudden diarrhea during pregnancy, suggesting it was not absolutely forbidden in all classical contexts. However, the astringent and alkaloid-containing nature of this herb warrants caution, and it should only be used during pregnancy under the guidance of an experienced practitioner.

Breastfeeding

No specific classical or modern data directly addresses the safety of Shi Liu Pi during breastfeeding. The herb's alkaloid content (though small in the fruit rind compared to the root bark) raises theoretical concern about transfer through breast milk. The high tannin content could also potentially affect infant digestion. Use only under practitioner guidance and at standard or lower doses if needed while breastfeeding.

Children

Can be used in children with appropriate dose reduction proportional to body weight and age. Classical formulas for pediatric parasitic infections (such as pairing with Bing Lang for roundworms) included Shi Liu Pi with dose reduction noted. For children, use roughly one-third to one-half the adult dose depending on the child's age. Due to the slight toxicity, extended use in children should be avoided. The astringent taste is quite bitter, so combining with sugar or honey (if age-appropriate) may improve palatability.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Shi Liu Pi

CYP3A4 and CYP2C9 substrates: Pomegranate constituents (punicalagin and related tannins) have been shown in preclinical studies to inhibit intestinal CYP3A4 and CYP2C9 enzymes, potentially increasing the bioavailability and blood levels of drugs metabolized through these pathways. These include many commonly prescribed medications such as certain calcium channel blockers (e.g. nitrendipine), antiretrovirals (e.g. saquinavir), anxiolytics (e.g. buspirone), PDE5 inhibitors (e.g. sildenafil), and antibiotics (e.g. metronidazole). Clinical data are limited, but caution is warranted.

Tannin-drug interactions: The high tannin content (approximately 10% by weight) can bind to and reduce the absorption of concurrently taken oral medications, particularly iron supplements, alkaloid-containing drugs, and certain antibiotics. It is advisable to separate the timing of Shi Liu Pi from other oral medications by at least 1-2 hours.

Anticoagulants and antiplatelet agents: While no direct interaction studies exist, the herb's haemostatic (止血) properties could theoretically oppose anticoagulant or antiplatelet therapy. Monitor closely if used concurrently with warfarin or similar medications.

Dietary Advice

Foods and dietary considerations when taking Shi Liu Pi

Avoid iron-rich foods or iron supplements at the same time as taking Shi Liu Pi, as the tannins will bind iron and reduce absorption of both. Avoid cold, raw, and greasy foods while taking this herb for diarrhea or dysentery, as these can counteract its astringent effect. When using Shi Liu Pi for chronic diarrhea, warm and easily digestible foods (congee, cooked grains) are recommended. The classical pairing with brown sugar (砂糖) is said to moderate the astringent nature and harmonize the Stomach.

Botanical Description

Physical characteristics and morphology of the Shi Liu Pi source plant

Punica granatum L. is a deciduous shrub or small tree in the family Lythraceae (formerly Punicaceae), typically growing 2 to 7 metres tall. Young branches are often four-angled with spine-tipped ends. The leaves are opposite or nearly clustered, oblong to obovate, 2 to 8 cm long and 1 to 2 cm wide, with short petioles. The trunk is greyish-brown with knobby protrusions and often twists to the left.

Flowers appear singly or in small clusters at branch tips or in leaf axils, with a thick, bell-shaped calyx that is characteristically red. Petals are typically bright red (less commonly orange, yellow, or white), with numerous stamens. The fruit is a large, nearly spherical berry about 6 cm in diameter, with a thick, leathery rind topped by the persistent calyx. Inside, the fruit contains numerous seeds, each surrounded by a juicy, translucent red or white aril. The medicinal part is the dried fruit rind (pericarp), which is 1.5 to 3 mm thick after drying.

Sourcing & Harvesting

Where Shi Liu Pi is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Autumn, when the fruit is fully ripe and the top begins to split open naturally.

Primary growing regions

Pomegranate originated in Central Asia (the region around modern-day Iran) and was reportedly introduced to China during the Western Han Dynasty by Zhang Qian, the famous envoy to the Western Regions. It is now cultivated throughout China, north and south. The principal producing regions include Jiangsu, Henan, Anhui (notably Huaibei, famous for its centuries-old Huangli soft-seed pomegranate), Shandong, Shaanxi, Sichuan, Yunnan, and Xinjiang. Jiangsu and Henan are noted for the largest cultivation areas. Jiangsu is known for its Crystal Pomegranate (水晶石榴) varieties.

Quality indicators

Good quality Shi Liu Pi should have thick pieces (1.5 to 3 mm), with a reddish-brown to dark brown outer surface showing a slight lustre and numerous small wart-like protrusions. The inner surface should be yellow to reddish-brown with a raised, net-like pattern from the remnant fruit pedicle. The pieces should be hard and brittle, with a yellow, slightly granular cross-section. There should be no odour, and the taste should be distinctly bitter and astringent. Older, aged pieces from mature trees are traditionally preferred (陈久者佳). Avoid pieces that are thin, pale, or that still have significant pulp or seed remnants attached.

Classical Texts

Key passages from the classical Chinese medical texts that describe Shi Liu Pi and its therapeutic uses

《名医别录》(Ming Yi Bie Lu)

「止下利、漏精。」

"Stops diarrhea and seminal leakage."

《药性论》(Yao Xing Lun)

「治筋骨风，腰脚不遂，步行挛急疼痛。主涩肠，止赤白下痢。取汁止目泪下，治漏精。」

"Treats wind in the sinews and bones, inability to move the lower back and legs, cramping pain during walking. Primarily astringes the intestines and stops red and white dysentery. The juice stops tearing of the eyes and treats seminal leakage."

《本草汇言》(Ben Cao Hui Yan)

「石榴皮，涩肠止痢之药也。能治久痢虚滑不禁，并妇人血崩、带下诸疾，又安蛔虫。盖取酸涩收敛下脱之意，与诃子肉、罂粟壳同义。」

"Shi Liu Pi is a medicinal for astringing the intestines and stopping dysentery. It can treat chronic dysentery with deficiency-type slippery stool, as well as women's flooding and vaginal discharge. It also settles roundworms. Its action derives from its sour-astringent quality that binds and lifts what is descending, similar in principle to He Zi (Chebula) and Ying Su Ke (Poppy Husk)."

《本草从新》(Ben Cao Cong Xin)

「能恋膈成痰，痢积未尽者，服之太早，反为害也。」

"It can retain phlegm in the diaphragm. If dysentery accumulation has not yet been cleared, taking it too early will instead cause harm."

《滇南本草》(Dian Nan Ben Cao)

「治日久水泻，同炒砂糖煨服，又治痢脓血，大肠下血。」

"Treats long-standing watery diarrhea: stir-fry with sugar and simmer before taking. Also treats dysentery with pus and blood, and large intestinal bleeding."

《雷公炮炙论》(Lei Gong Pao Zhi Lun)

「凡使石榴皮、叶、根，勿令犯铁。」

"Whenever using pomegranate rind, leaves, or root, do not let them come into contact with iron." (This relates to the high tannin content, which reacts with iron.)

Historical Context

The history and evolution of Shi Liu Pi's use in Chinese medicine over the centuries

The pomegranate was introduced to China from Central Asia by the Han Dynasty envoy Zhang Qian (张骞) around the 2nd century BCE. The Jin Dynasty scholar Lu Ji wrote that "Zhang Qian served as Han envoy for eighteen years and obtained the 'tu lin' pomegranate from the An Shi kingdom" (涂林安石榴). This origin story explains the classical name An Shi Liu (安石榴, "pomegranate of Anshi"). Li Shizhen in the Ben Cao Gang Mu offered an alternative etymology, noting that planting pomegranates with stones and old bones at the roots made them flourish, hence "An Shi" may also mean "with stones settled." He further explained that "Liu" (榴) means "Liu" (瘤, tumour/knob), because the red fruits hang down like lumpy growths.

The medicinal use of pomegranate rind was first recorded in the Ming Yi Bie Lu (名医别录), compiled during the Southern and Northern Dynasties period (around 5th century CE). The famous Yuan Dynasty physician Zhu Danxi and his student Dai Sigong feature in a well-known anecdote: when Zhu could not stop a friend's chronic diarrhea, his student Dai Sigong added just three qian of Shi Liu Pi to the master's formula, and the condition resolved. This story illustrates the herb's reputation as a powerful intestinal astringent. Classical authors often compared its action to that of He Zi (Chebula) and Ying Su Ke (Poppy Husk), the other major astringent herbs for chronic dysentery.

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of Shi Liu Pi

1

RCT: Pomegranate peel extract in non-alcoholic fatty liver disease (2023)

Ghasemi S, Karimi Shahri M, Hosseinzadeh H, et al. Nutrition Journal, 2023, 22, 47.

A randomized double-blind clinical trial gave 39 NAFLD patients 1500 mg of pomegranate peel extract capsules daily for 8 weeks alongside a calorie-deficit diet, while 37 patients received placebo. The pomegranate group showed significant reductions in liver stiffness and the hepatorenal ultrasound index compared to placebo, suggesting potential benefit for liver health in metabolic syndrome.

PubMed
2

RCT: Pomegranate peel extract effects on liver enzymes and lipid profile in NAFLD (2024)

Moshfegh F et al. Food Science & Nutrition, 2024.

A double-blind randomized trial in 46 NAFLD patients found that 1000 mg daily pomegranate peel extract for 10 weeks significantly reduced triglycerides, ALT, AST, and hs-CRP, and significantly increased HDL-C compared to placebo. However, total cholesterol, LDL-C, and fatty liver grade changes were not significantly different between groups.

PubMed
3

Triple-blind RCT: Pomegranate peel extract mouthwash vs chlorhexidine for oral bacteria (2021)

Aravinth V et al. International Journal of Dentistry, 2021, 2021, 5567305.

A triple-blind randomized clinical trial compared pomegranate peel extract mouthwash to chlorhexidine in 60 high caries risk adults. Using quantitative real-time PCR to measure S. mutans, Lactobacilli, and Veillonella in saliva at 2 and 4 weeks, the study found pomegranate peel extract showed comparable antibacterial effectiveness to chlorhexidine, supporting its potential as a natural oral antimicrobial agent.

PubMed
4

Preclinical study: Antifungal activity of pomegranate peel extract and punicalagin against dermatophytes (2014)

Foss SR, Nakamura CV, Ueda-Nakamura T, et al. BMC Complementary and Alternative Medicine, 2014, 14, 392.

This laboratory study found that pomegranate peel crude extract and its isolated compound punicalagin showed significant antifungal activity against Trichophyton and Microsporum dermatophytes. Punicalagin was identified as the key active compound with MIC values of 125-250 mcg/mL. Cytotoxicity testing showed the extract was 6.4 times more selective for fungal cells than mammalian cells, supporting its safety for potential topical use.

PubMed
5

Review: Impact of pomegranate juice on CYP3A4- and CYP2C9-mediated drug metabolism (2023)

Alhalmi A, Amin S, Khan SA, et al. Molecules, 2023, 28(5), 2117.

This review summarized preclinical and clinical evidence on pomegranate's effects on drug-metabolizing enzymes. Preclinical studies showed prolonged pomegranate administration increased the bioavailability of buspirone, nitrendipine, metronidazole, saquinavir, and sildenafil by reducing intestinal CYP3A4 and CYP2C9 activity. Clinical data were limited to single-dose studies and showed less pronounced effects. The review highlights the need for caution when combining pomegranate products with CYP3A4/CYP2C9-metabolized drugs.

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.