Catkin

Catkin (Pollen Typhae / Pu Huang): A Comprehensive Reference

1. Identity: Botanical Classification, Natural Source, and Common Forms

1.1 What Is a Catkin?

A catkin (also called an ament, from the Latin amentum) is a specialized type of flowering inflorescence — a densely packed, pendulous or erect spike of small, reduced, often unisexual flowers — found on a wide range of wind-pollinated trees and herbaceous plants. The word "catkin" entered English in 1578 when Henry Lyte coined it in his translation of Dodoens' New Herbal as a translation of the Dutch katteken (kitten), used for the downy inflorescences of willows and other plants. Notable catkin-bearing genera include members of the order Fagales — oaks, walnuts, hazels, birches, and alders — and the relatively distantly related family Salicaceae, comprising willows and poplars.

As a dietary supplement ingredient, the term "catkin" most specifically refers to the dried pollen harvested from the male catkin inflorescences of aquatic plants of the genus Typha (cattails or bulrushes), which produce one of the most historically used and currently studied pollen-based medicines in the world. Typhae Pollen is one of the earliest pollen varieties used in the world, whether as a herbal medicine or a dietary additive. Pollen from other catkin-bearing species — notably birch (Betula spp.), pine (Pinus spp.), and chestnut (Castanea sativa) — has also attracted research attention and forms part of the broader catkin-pollen supplement category, though the Typha-derived product has the most substantial body of literature and the longest pharmacopeial record.

1.2 Botanical Sources

Pollen Typhae (Pu Huang) is the dry pollen of the hydrophilic herbaceous plant Typha angustifolia L., T. orientalis Presl, or sibling plants of the family Typhaceae (Bulrush family). The genus Typha comprises a series of perennial aquatic or marsh plants; there are 24 species distributed across the world, and 12 of them are found in China. These wetland plants grow on the edges of ponds, lakes, and streams throughout the world and are often considered to be invasive species.

The plants are monoecious, bearing separate male and female flower spikes on the same stem. The male (staminate) spike sits at the top of the flowering stalk above the larger, brown, cigar-shaped female spike. Pine pollen is the fine yellow powder released by pine trees every spring that forms part of the reproductive life cycle of the tree; the powder is produced inside the catkin (male flowers) of pine trees. Similarly, Typha pollen is released in mass from the male portion of the plant's unique, club-shaped catkin-like inflorescence.

The official TCM sources are T. angustifolia and T. orientalis (Oriental Cattail), while T. latifolia (Common Cattail) is a common Western source also used in TCM.

1.3 Harvesting and Common Preparations

The yellow male inflorescence is picked from the cattail's spike, dried in the sun, then ground and screened; the pollen may be used unprocessed or stir-baked (charred). The male inflorescence is harvested in summer and crushed after sun-drying, then put through a seventh sieve (120 mesh) to remove impurities. The final product is characterized by a bright yellow color, lightness, fine and velvety texture, and is cleaned and purified.

Two primary pharmaceutical forms are recognized in traditional practice and in contemporary Chinese pharmacopoeia:

• Raw Pollen Typhae (Pu Huang): The unprocessed, dried pollen. Used primarily to invigorate blood circulation and resolve blood stasis.
• Carbonized Pollen Typhae (Pu Huang Tan / Pollen Typhae Carbonisata, PTC): Carbonized Typhae Pollen (CTP) is a processed product of Typhae Pollen after stir-frying, and is a well-known Traditional Chinese Medicine with functions of removing blood stasis and hemostasis.

Both the raw pollen grains and the Pollen Typhae charcoal are listed in the Pharmacopoeia of the People's Republic of China (2015 edition). Beyond TCM formulations, catkin pollen more broadly is available in modern supplement forms including granules, capsules, tablets, pellets, and powders.

2. Traditional and Historical Use

2.1 Traditional Chinese Medicine (TCM)

Pu Huang was first recorded in the Shen Nong Ben Cao Jing (Divine Farmer's Classic of Materia Medica), where it was classified as a "superior" (上品) herb, indicating that it was considered safe for long-term use. The classical name literally means "cattail yellow," referring to the bright golden-yellow pollen of the cattail plant (蒲, the cattail; 黄, yellow).

Typhae Pollen (PT), known as Puhuang, was originally recorded in the Shen Nong Ben Cao Jing and was commonly used as a herbal medicine to treat dysmenorrhea, stranguria, stroke, and angina pectoris. The herb's later elaboration in the monumental 16th-century pharmacopeia Ben Cao Gang Mu by Li Shizhen solidified its canonical status. Li Shizhen cited historical cases of Pu Huang's ability to cool and invigorate Blood in the Ben Cao Gang Mu.

Pu Huang belongs to the category of Herbs That Stop Bleeding in the Chinese Materia Medica but has a dual nature characteristic of Chinese herbal medicine: raw, it invigorates the Blood; charred (Pú Huáng Tàn), it stops bleeding. The unprocessed form activates blood circulation and dispels stasis, while the charred form is used to stop bleeding.

In TCM classification, Pu Huang is sweet in flavor and neutral in temperature, and enters the Liver and Heart meridians; its primary actions are to stop bleeding, resolve stasis, and induce diuresis.

Classical indications included a wide range of bleeding disorders. Clinical applications to stop bleeding included abnormal/chronic uterine bleeding, nosebleeds, coughing or vomiting up blood, and blood in the stools or urine. The herb also had prominent gynecological applications. Uses recorded in historical texts included topical application to stop external bleeding, treatment of coughing or spitting blood, blood in the urine or stool, uterine bleeding, chest pain, menstrual pain, postpartum abdominal pain, and retention of the lochia.

A famous historical anecdote illustrates the herb's broader scope in classical practice: Emperor Duzong of the Southern Song Dynasty developed a severe, sudden swelling of the tongue that filled his entire mouth, leaving him unable to speak or eat; the imperial physician Cai prescribed a simple powder of equal parts Pu Huang and dried ginger (Gan Jiang) applied directly to the swollen tongue, which rapidly cured the condition.

In TCM practice, raw Pollen Typhae was frequently combined with Trogopterus feces (Wu Ling Zhi) in the classical formula Shi Xiao San (Sudden Smile Powder) to treat blood stasis–type pain, including dysmenorrhea and epigastric pain.

2.2 Carbonization in TCM Processing

Charcoal medicine, named "Tan Yao" in China, is a kind of special processing product in Chinese medicine used for the treatment of hemoptysis, hematemesis, and hemorrhage in clinical practice during ancient times; the principal method of preparation is carbonizing the drugs by high-temperature heating. Some components are lost during carbonizing, but the hemostatic efficacy is enhanced and the toxic effect of the crude drug is reduced according to Traditional Chinese Medicine theory.

The charcoal-processed product (PTC) was recorded in the Compendium of Materia Medica during the Ming Dynasty (1578 A.D.) at the earliest, and is acknowledged in the 2015 Pharmacopoeia of the People's Republic of China as a hemostatic drug.

2.3 Western and Other Traditions

In European folk traditions, the catkin-bearing hazel (Corylus avellana) was occasionally employed medicinally. The bark, leaves, flowers, catkins, and nuts of hazel are all considered astringent, wound-healing, blood-purifying, fever-fighting, and sweat-inducing. However, the plant has not been heavily used in herbal medicine through the ages. Similarly, the catkins of chestnut (Castanea sativa) were used in folk contexts: flowers from semiwild and wild species such as C. sativa have been traditionally used for several folk medicine applications.

In the Western tradition, Typha pollen (cattail down) was primarily used externally. The pollen was most often used in the West for external purposes, while the TCM tradition primarily used the pollen internally.

3. Key Constituents and Active Compounds

3.1 Flavonoids (Primary Bioactive Class)

The main chemical compositions of Pollen Typhae were flavonoids, sterols, long-chain hydrocarbons, amino acids, and organic acids. The pollen of Typha angustifolia L. (Typhaceae) has been used as a traditional Chinese medicine for improving microcirculation and promoting wound healing; flavonoids are the main constituent in the plant.

The major individually identified flavonoid compounds include:

• Typhaneoside (isorhamnetin-3-O-neohesperidoside derivative): The main structure group in Puhuang was flavonoids, and the major components were typhaneoside and I3ON (isorhamnetin-3-O-neohesperidoside).
• Isorhamnetin-3-O-neohesperidoside (I3ON)
• Kaempferol 3-O-neohesperidoside
• Naringenin (NAR), a dihydroflavonoid

The active subfraction of Typhae Pollen mainly comprises flavonoid glycosides and dihydroflavonoids; the sum of the contents of 8 flavonoids was 290.05 mg/g in the active subfraction, including typhaneoside, isorhamnetin 3-O-neohesperidoside, kaempferol 3-O-neohesperidoside, and naringenin.

3.2 Sterols and Phytosterols

Phytosterols — particularly β-sitosterol and its derivatives — are important constituents. β-Sitosterol palmitate was shown to inhibit smooth muscle cell (SMC) proliferation, and β-sitosterol glucoside showed an inhibitory effect on platelet aggregation. Stigmasterols have also been identified in pollen extracts.

3.3 Polysaccharides

Polysaccharides represent another major constituent class. A pectin polysaccharide (PTPS-2-2) has been obtained from T. angustifolia pollen through water extraction, ion-exchange chromatography, and gel chromatography; structural characterization showed it had a molecular weight of 54 kDa and was composed of rhamnose, arabinose, xylose, galactose, and galacturonic acid. Polysaccharides contribute to the hypolipidemic effects of the pollen: many polysaccharides produced hypolipidemic potential by inhibiting oxidative stress by acting as natural scavengers of free radicals and other reactive oxygen species.

3.4 Organic Acids and Other Constituents

Several phenolic acids have been identified in Pollen Typhae, including vanillic acid and p-coumaric acid, which serve as quality-control markers and contribute to the herb's pharmacological profile. Additionally, the pollen contains amino acids, long-chain hydrocarbons, linoleic acid, and other unsaturated fatty acids. Studies have proven that the main constituents of Pollen Typhae contain flavones, linoleic acid, and other unsaturated fatty acids.

3.5 Carbon Quantum Dots (Post-Carbonization)

A remarkable recent finding relates to the charcoal-processed form. Researchers discovered and separated novel water-soluble carbon quantum dots (CQDs, named PTC-CQDs) from aqueous extracts of Pollen Typhae Carbonisata (PTC), a calcined herb drug that has been used as a hemostatic medicine to promote hemostasis for thousands of years. The PTC-CQDs are spherical, monodisperse, and have a narrow size distribution between 2 and 8 nm; pharmacology experiments revealed remarkable anti-hemorrhagic effects, and rats showed a profound decrease in activated partial thromboplastin time and increase in fibrinogen and platelets after PTC-CQD treatment.

4. Established Mechanisms of Action

4.1 Hemostatic and Anticoagulant Activity

Pollen Typhae demonstrates a paradoxical bidirectional activity on the coagulation cascade that is deeply embedded in its classical TCM description. Pharmacological research has indicated that characteristic constituents of PT have pro-coagulant, anti-coagulant, and hemostatic activities. Typhae Pollen (TP) and its carbonized product (CTP) have been widely used in clinical settings; TP boasts an effect of removing blood stasis and promoting blood circulation, while CTP typically presents a hemostatic function. The two forms thus mechanistically diverge post-processing.

The flavonoid isorhamnetin-3-O-rhamnosyl-glucoside was shown to stimulate endothelial cells (EC) to produce tissue plasminogen activator (tPA) and prostacyclin (PGI₂); quercetin-3-O-neohesperidose was shown to protect EC from injury by fibrin and raise tPA activity. These findings point to anti-thrombotic and endothelium-protective mechanisms in the raw form.

4.2 Anti-Inflammatory Mechanisms

Multiple signaling pathways have been implicated. Pollen Typhae total flavone (PTF) can inhibit IL-6 mRNA expression and IL-6 protein secretion via the nuclear factor-κB (NF-κB) pathway in C2C12 skeletal muscle cells, which may be one of its mechanisms in relieving inflammation and insulin resistance. In macrophage models, PTF flavonoids modulate the NLRP3 inflammasome and AMPK-mediated lipid metabolism pathways. PTF also inhibits iNOS and COX-2 signaling, as evidenced by studies with LPS-stimulated RAW 264.7 macrophages. Phytochemical constituents present in Typha angustifolia Linn could be used for treating inflammation-related diseases.

4.3 Antioxidant Mechanisms

Extracted activities were measured using DPPH and ferric chloride reducing assays; typhaneoside and I3ON were investigated for their relationship with NO, MDA, and SOD in HUVECs treated with LPS, and were found to modulate these oxidative stress markers. The conclusions of this study indicate that the constituents from Typha angustifolia could be a novel therapeutic strategy for LPS-induced inflammation.

4.4 Metabolic and Insulin-Sensitizing Mechanisms

Defects in insulin-stimulated glucose uptake in skeletal muscle result from dysfunction of insulin signaling including the PI3K pathway and a β-arrestin-2-mediated signaling, which leads to insulin resistance (IR); Pollen Typhae, a Chinese herb used for thousands of years in TCM, has the potential to inhibit the development of IR. More specifically, PTF improved insulin-stimulated glucose uptake in a dose- and time-dependent manner in C2C12 myotubes and prevented palmitate-induced IR. The anti-diabetes mechanisms of PTF involve increasing glucose consumption and glucose uptake, improving palmitic acid-caused insulin resistance in C2C12 myotubes through the regulation of the β-arrestin-2-mediated pathway, and promoting GPR40 signaling to relieve palmitic acid-caused impairment of glucose-stimulated insulin secretion in INS-1 pancreatic β cells.

4.5 Anti-Atherosclerotic Mechanisms

Based on investigations showing that Pollen Typhae had anti-atherogenic effects, several components were isolated successively from the drug and their effects on porcine aortic endothelial cell (EC) and smooth muscle cell (SMC) cultures as well as platelet aggregation were examined; 12 components were identified, and 4 of them showed different evident anti-atherogenic effects. Additionally, inhibition of endoplasmic reticulum (ER) stress-induced apoptosis in oxidized low-density lipoprotein (ox-LDL)-induced human aortic vascular smooth muscle cells (HA-VSMCs) was associated with suppression of the PERK–eIF2α–ATF4–CHOP signaling pathway by PTF.

5. Scientific Evidence by Area of Use

5.1 Hemostasis and Bleeding Disorders

Evidence level: Preclinical (animal and in vitro), with supportive historical clinical record in China.

Pollen Typhae Carbonisata (PTC) is a type of calcined herb drug that has been used as a hemostatic medicine to promote hemostasis for thousands of years. Supported by consecutive clinical evidence and literature documentation, the hemostatic effect of PTC is regarded as well established within TCM practice. Mechanistic research has begun to elucidate the material basis of this effect. PT has traditionally been processed by carbonizing, and modern pharmacological studies have proved that carbonized PT is more effective in hemostasis. Critically, the water-soluble carbon quantum dots isolated from PTC represent a newly identified active fraction with demonstrable pro-coagulant activity in preclinical models. Limitation: Controlled human clinical trials specifically designed to evaluate the hemostatic effect of PTC in isolation are not yet available in peer-reviewed Western literature.

5.2 Cardiovascular Disease and Atherosclerosis

Evidence level: Preclinical (cell culture and animal models). Limited clinical use in China for hyperlipidemia.

The pollen of Typha angustifolia L., known as Pollen Typhae, has been used as a traditional Chinese medicine for improving microcirculation and treating hyperlipidemia. T. angustifolia pollen decoction was clinically used to treat hyperlipidemia in China. However, the mechanistic evidence is predominantly preclinical:

• Isorhamnetin-3-O-rhamnosyl-glucoside stimulated EC to produce tPA and PGI₂; quercetin-3-O-neohesperidose protected EC from fibrin-induced injury; β-sitosterol palmitate inhibited SMC proliferation; and β-sitosterol glucoside showed an inhibitory effect on platelet aggregation in cell culture experiments.
• PTF suppressed insulin-promoted proliferation of vascular smooth muscle A7r5 cells in a concentration-dependent fashion, with the mechanism identified as inhibition of ERK1/2 phosphorylation via MEK1/2-ERK1/2 cascades, providing insight into the potential uses of PTF for treatment of diabetic atherosclerosis.

Limitation: No adequately powered, randomized controlled trials (RCTs) in human subjects have been published in peer-reviewed international literature establishing clinical efficacy for cardiovascular endpoints.

5.3 Diabetes and Insulin Resistance

Evidence level: Preclinical (cell culture and animal models). No robust human RCT evidence.

Pollen Typhae, a Chinese herb used for thousands of years in TCM, has the potential to inhibit the development of insulin resistance (IR); PTF, the extract from Pollen Typhae, was shown to ameliorate high-glucose- and high-insulin-induced impairment of glucose uptake in 3T3-L1 adipocytes. A follow-up in vivo study found that PTF ameliorated insulin resistance and dyslipidemia, but failed to significantly increase body weight in type 2 diabetic rats induced by high-fat diet and low-dose streptozotocin.

At the pancreatic β-cell level, PTF, an extract from Pollen Typhae, has been reported to effectively treat type 2 diabetes; in INS-1 cells, palmitic acid severely impaired glucose-stimulated insulin secretion (GSIS) in a time-dependent manner, and PTF treatment prevented the impairment in a dose-dependent manner. Clinically, in clinical research and animal studies, the Chinese herbal formula "Yiqi Sanju Formula" chiefly consisting of Pollen Typhae and several other Chinese herbs has been used to treat type 2 diabetes, central obesity, and non-alcoholic fatty liver disease, showing anti-insulin resistance activity. However, this formula contains multiple herbs, making it impossible to attribute observed effects specifically to Pollen Typhae. Limitation: All direct PTF evidence is from animal or cell-culture models. No stand-alone human clinical trials for PTF in diabetes management have been reported in indexed peer-reviewed literature.

5.4 Dysmenorrhea and Gynecological Pain

Evidence level: Traditional clinical use corroborated by mechanistic animal studies. Combination formula evidence in Chinese clinical trials.

Typhae Pollen was recorded in the earliest Chinese materia medica and was commonly used to treat dysmenorrhea. The classical formula Shi Xiao San (Sudden Smile Powder) pairing Pollen Typhae with Trogopterus feces has been the subject of bioactivity-guided research. Typha angustifolia has been used as a traditional Chinese medicine with the abilities to improve microcirculation, induce uterine contractions, and treat wound healing. The uterine-contracting effect of the raw form is consistent with its TCM indication for expelling stasis and lochia.

Limitation: Controlled trials using isolated Pollen Typhae for dysmenorrhea are not available in international peer-reviewed literature. Evidence remains at the level of traditional use and combination-formula trials conducted within China.

5.5 Benign Prostatic Hyperplasia (BPH)

Evidence level: Preliminary preclinical (animal models). Mechanistic plausibility.

Typhae Pollen has been reported to alleviate benign prostatic hyperplasia (BPH) and is widely used in traditional Chinese medicine prescriptions, though its active components and potential mechanisms of action remain insufficiently understood. An in vivo study found that the Typhae Pollen active subfraction alleviated prostate enlargement, decreased prostate epithelial tissue thickness, inhibited androgen levels, and network pharmacology analysis demonstrated it may suppress angiogenesis in BPH by inhibiting VEGF signaling and arachidonic acid metabolism.

For comparison, other plant pollens have been studied for BPH in clinical trials: Qianlie Kang Pule'an tablets made of Brassica campestris pollen have been used for BPH through animal and several clinical trials; Cernilton, prepared mainly from Secale cereale pollen, improves BPH by inhibiting the synthesis of prostaglandins and leukotrienes. Limitation: Published human clinical trial evidence for Typhae Pollen alone in BPH is absent in indexed international literature.

5.6 Anti-Inflammatory Effects

Evidence level: In vitro and animal model only.

In vivo studies have demonstrated the anti-inflammatory activity of T. angustifolia extract in carrageenan-induced rats, showing promising results for treating both acute and chronic conditions. Other studies have further highlighted its pharmacological activities, including immunosuppressive, wound healing, and anti-atherosclerotic effects. An ethanolic extract study found that phytochemical constituents present in Typha angustifolia Linn could be used for treating inflammation-related diseases.

5.7 Diabetic Retinopathy

Evidence level: Animal model and network pharmacology only.

A network pharmacology study analyzed the mechanisms by which Pollen Typhae might address diabetic retinopathy, identifying key bioactive compounds and target proteins through computational analysis. An animal study cited in the literature found that Typhae pollen polysaccharides ameliorated diabetic retinal injury in a streptozotocin-induced diabetic rat model (J Ethnopharmacol, 2018; 224: 169–176). Limitation: No human clinical trial evidence.

5.8 Wound Healing and Antimicrobial Activity

Evidence level: Preclinical and in vitro.

Typha angustifolia has been used as a traditional Chinese medicine to treat atherosclerosis and wound healing, and to induce the differentiation and stimulate the proliferation of human keratinocytes. In the related area of chestnut catkin flowers, the antimicrobial properties of C. sativa flowers provide a potential applicability as natural antimicrobials in the food processing chain. Several studies have proven the antioxidant and antimicrobial potential of C. sativa flowers as a raw matrix.

6. Body Systems and Health Areas Associated with Catkin Use

Based on the available literature, the following body systems and health areas are associated with Pollen Typhae:

• Hematological / Coagulation System: Hemostasis, blood stasis, anticoagulation, platelet aggregation modulation.
• Cardiovascular System: Hyperlipidemia and improvement of microcirculation, as well as anti-atherosclerotic effects documented in traditional use and in preclinical research.
• Metabolic System: Insulin resistance, dyslipidemia, type 2 diabetes management in preclinical models.
• Gynecological / Reproductive System: Dysmenorrhea, uterine bleeding, postpartum pain, lochia retention.
• Urinary System: Promotes urination and relieves conditions like urinary bleeding and urinary strangulation.
• Musculoskeletal System: Reduction of inflammation in skeletal muscle, particularly in the context of insulin resistance.
• Urological System: Benign prostatic hyperplasia in preclinical models.
• Ocular System: Diabetic retinopathy in preclinical models.
• Immune System: Anti-protozoal and anti-genotoxic activities have been documented in pharmacological research.

7. Dosage Forms and Dosages Reported in Studies

The following dosages and forms are reported in the source literature. These are provided strictly as reported and do not constitute dosage recommendations.

• PTF extraction procedure (laboratory): Dried pollen was extracted with 85% ethanol in four cycles; the resulting solution was filtered and concentrated under low-temperature, vacuum conditions; extracts were purified by macroporous resin adsorption and dried by spray drying; the dried powder, with an extraction rate of 0.8%, had a flavonoid content of 90.25%.
• Anti-inflammatory in vitro assay: Plant material (1 g) was extracted by 95% ethanol and water (10 mL × 2, 1 hour each); extracted activities were measured at 0.8–2.6 mg/mL for DPPH and 1.7–2.6 mg/mL for ferric chloride reducing activity.
• HUVECs inflammation model: Typhaneoside and I3ON were investigated at 2.8–70 μmol/L in HUVECs treated with 100 μg/mL of LPS for 24 hours.
• Diabetic rat model (insulin resistance): PTF is reported to enhance glucose uptake in C2C12 myotubes in vitro; in vivo, PTF ameliorated insulin resistance and dyslipidemia in type 2 diabetic rats induced by high-fat diet and low-dose streptozotocin. (Specific in vivo dosage not stated in available abstract data.)
• Traditional Chinese medicine decoction: T. angustifolia pollen decoction was clinically used to treat hyperlipidemia in China, though specific dosage ranges for this clinical use are not detailed in the available source extracts.

The Chinese Pharmacopoeia lists both crude and carbonized Pollen Typhae, with clinical doses in TCM practice typically administered as part of decoctions or powders.

8. Safety Considerations and Interactions

8.1 Pregnancy Contraindication

Pollen Typhae is contraindicated in pregnancy because of uterine stimulation. Typha angustifolia has been used as a traditional Chinese medicine with the ability to induce uterine contractions. This property is considered both a traditional therapeutic indication (for expelling retained lochia postpartum) and a primary safety concern during pregnancy.

8.2 Form-Dependent Appropriate Use

The raw form should be used cautiously in heavy bleeding without stasis; the charred form should be used when haemostasis is the priority. Inappropriate application of the wrong form — raw versus carbonized — can worsen the underlying clinical picture in TCM terms. This dual action also has mechanistic grounding: the chemical profile changes substantially upon carbonization, including the generation of novel carbon quantum dot species.

8.3 Interaction with Anticoagulants and Antiplatelet Agents

Individuals taking anticoagulants or antiplatelet medication should exercise caution, as the interaction is variable; some stop-bleeding herbs also modulate platelets bidirectionally. Given that raw Pollen Typhae contains compounds documented to stimulate tPA production and inhibit platelet aggregation, additive effects with anticoagulant or antiplatelet drugs — including warfarin, aspirin, or clopidogrel — represent a theoretical concern that has not been formally studied in human pharmacokinetic trials.

8.4 Pharmacopeial Recognition and General Safety Profile

Pollen Typhae is a well-known TCM medicine widely used clinically for antithrombosis, wound healing, and bleeding; both the raw pollen grains and the charcoal are listed in the Pharmacopoeia of the People's Republic of China (2015 edition). Adverse effects of plant pollens are rarely reported in the research literature.

8.5 Classical Incompatibilities

Pollen Typhae is not listed in either of the two classical incompatibility texts — Shi Ba Fan (Eighteen Antagonisms) or Shi Jiu Wei (Nineteen Mutual Inhibitions) — the foundational classical texts enumerating herb–herb incompatibilities in TCM.

8.6 Pollen Allergy

As with any pollen-derived product, the potential for allergic sensitization should be considered in individuals with known pollen allergies. In Europe, hazelnuts (whose catkins are a major airborne pollen source) are a frequent cause of food allergies; allergies to hazelnut can start at a young age and can be severe, and people who suffer from nut allergies should avoid related products. While this specific caution is for hazelnut food products, it illustrates the broader principle that catkin-bearing plant products carry allergenic risk, particularly in sensitized individuals. Individuals with known pollen allergies should approach catkin-derived supplements with caution.

8.7 Quality Variability and Adulteration

In China, Typhae Pollen has been extensively utilized as a medicinal product; however, existing methods for differentiating the botanical origin and controlling the quality of TP are confusing, unreliable, and unsystematic. This quality-control concern has practical safety implications, as the botanical origin significantly affects phytochemical composition and pharmacological activity. Research employing UHPLC-DAD/Q-TOF-MS and multivariate chemometric analysis is ongoing to address these gaps.

9. Regulatory and Pharmacopeial Status

Both the raw pollen grains and the Pollen Typhae charcoal are listed in the Pharmacopoeia of the People's Republic of China (2015 edition). Pollen Typhae thus has formal pharmacopeial status in China. Outside of China, the ingredient is not formally monographed in major Western pharmacopeias (e.g., USP, European Pharmacopoeia, or WHO Monographs) as of the available source date. Where sold in Western markets, it is classified as a dietary supplement ingredient and subject to the regulatory frameworks governing such products in respective jurisdictions.

10. Current Research Status and Limitations

The body of published research on Pollen Typhae (catkin pollen) is substantial within the Chinese scientific literature but remains predominantly preclinical. Pollen Typhae total flavone (PTF), the extract of Pollen Typhae, possesses anti-inflammatory and anticoagulant activities based on cell and animal studies. The pharmacological research has, however, uncovered multiple plausible mechanisms spanning metabolic, cardiovascular, hemostatic, and anti-inflammatory domains.

Evidence strength by domain can be summarized as follows:

• Hemostasis (carbonized form): Strong traditional and pharmacopeial support; moderate preclinical mechanistic evidence; human RCT evidence limited.
• Cardiovascular / hypolipidemic: Traditional clinical use in China; preclinical mechanistic evidence from cell and animal models; no international human RCT data.
• Insulin resistance / diabetes: Well-developed preclinical mechanistic literature; combination formula clinical use in China; no stand-alone human RCT evidence for PTF.
• Anti-inflammatory: In vitro and animal model evidence; no human trial evidence.
• BPH, diabetic retinopathy, wound healing: Preliminary preclinical evidence only.

As noted in the relevant literature, the potentialities of catkin flowers for pharmaceutical and food industries represent a promising field of research; pharmaceutical industries could use these by-products as excipients for dietary supplements and take advantage of their natural content in polyphenols for health purposes.

References

• Comprehensive Quality Evaluation and Botanical Differentiation of Typhae Pollen Using UHPLC-DAD/Q-TOF-MS and Multivariate Chemometric Analysis — PubMed (2025)
• Pharmacokinetic comparison of two phenolic acids after oral administration of Typhae Pollen — PubMed (2017)
• Typhae Pollen active subfraction exerts antiangiogenic effect in benign prostatic hyperplasia via VEGF signaling — PubMed (2025)
• Effects of carbonized process on quality control, chemical composition and pharmacology of Typhae Pollen: A review — ScienceDirect / Journal of Ethnopharmacology (2021)
• Screening of Combinatorial Quality Markers for Natural Products by Metabolomics: A Case Study on Pollen Typhae — PMC / Frontiers in Pharmacology (2018)
• Hemostatic bioactivity of novel Pollen Typhae Carbonisata-derived carbon quantum dots — PMC (2017)
• Antioxidant capacity of Typha angustifolia extracts and two active flavonoids — PMC / Pharmaceutical Biology (2017)
• The antiatherogenic effects of components isolated from Pollen Typhae — ScienceDirect / Thrombosis Research (1990)
• Pollen Typhae total flavone improves insulin resistance in high-fat diet and low-dose streptozotocin-induced type 2 diabetic rats — PubMed (2014)
• Pollen Typhae total flavone improves insulin-induced glucose uptake through the β-arrestin-2-mediated signaling in C2C12 myotubes — PubMed / International Journal of Molecular Medicine (2012)
• Protective role of Pollen Typhae total flavone against the palmitic acid-induced impairment of glucose-stimulated insulin secretion involving GPR40 signaling in INS-1 cells — Spandidos / Int J Mol Med (2017)
• Pollen Typhae Total Flavone Inhibits Endoplasmic Reticulum Stress-Induced Apoptosis in Human Aortic-Vascular Smooth Muscle Cells through PERK-eIF2α-ATF4-CHOP — PubMed (2019)
• Ethanolic extract of Puhuang (Pollen Typhae) modulates LPS-induced inflammatory response through iNOS/COX-2 signaling in RAW 264.7 macrophage — PubMed (2022)
• Pollen typhae total flavone suppresses A7r5 cell proliferation promoted by insulin involving the MEK1/2-ERK1/2 cascades — PubMed (2023)
• Pollen Typhae total flavones inhibit expression of IL-6 in C2C12 skeletal muscle cells cultured with palmitate — PubMed (2008)
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• Investigating the Mechanisms of Pollen Typhae in the Treatment of Diabetic Retinopathy Based on Network Pharmacology and Molecular Docking — PubMed / Evidence-Based Complementary and Alternative Medicine (2022)