Picrorhiza kurroa Royle ex Benth (Kutki)

Picrorhiza kurroa Royle ex Benth (Kutki)

Product Name: Пикрозия курроа, Picrorhiza kurroa Royle ex Benth., Kutki, Picrorhiza, Picrorriza, Hellebore Indien, بيكرورهيزا كوروا, กุตกี, Пикрозия курроа, Пикрозия курроа, Пикрозия курроа, Пикрозия курроа, Пикрозия курроа, Пикрозия курроа, Пикрозия курроа, Пикрозия курроа, Пикрозия курроа

Synonyms: пикрориза курроа, катука, катуки, хеллебор индийский, Indian gentian, Kutki, Katuki, Indian Hellebore, Indischer Helleborus, Picrorhiza, Kutki, Hellebore Indien, بيكرورهيزا, كاتوك, กุตกี, คาทูกิ

Parts Used: rhizome, root, rhizome with roots.

Main Indications for Use of Picrorhiza kurroa: viral hepatitis, drug-induced hepatitis, chronic hepatitis, liver cirrhosis, fatty liver disease, dyspepsia, chronic enterocolitis, gastric ulcer, irritable bowel syndrome, chronic bronchitis, bronchial asthma, rheumatoid arthritis, systemic lupus erythematosus, psoriasis, atopic dermatitis, chronic eczema.

Use of Picrorhiza kurroa in Mixtures and Complexes: chronic renal failure, glomerulonephritis, type 2 diabetes mellitus, hyperlipidemia, metabolic syndrome, chronic obstructive pulmonary disease, systemic vasculitis, autoimmune thyroiditis.

Pharmacological Properties of Picrorhiza kurroa: hepatoprotective, choleretic, antioxidant, anti-inflammatory, immunomodulatory, antiviral, antibacterial, antifungal, antiallergic, cytoprotective, adaptogenic, hypolipidemic, antirheumatic, wound-healing, nephroprotective, photoprotective.

Dosage of Pharmaceutical Forms — Picrorhiza kurroa

Powder — Picrorhiza kurroa

Indications (Powder): viral hepatitis, drug-induced hepatitis, chronic hepatitis, liver cirrhosis, fatty liver disease, dyspepsia, chronic enterocolitis, gastric ulcer, irritable bowel syndrome, chronic bronchitis, bronchial asthma, rheumatoid arthritis, systemic lupus erythematosus, psoriasis, atopic dermatitis, chronic eczema.

Standard Dosage (Powder): 1.0–1.5 grams of powder 2 times a day 30 minutes before meals, taken with warm water.

Enhanced Dosage (Powder): 2.0 grams of powder 3 times a day for acute viral hepatitis, drug-induced hepatitis, pronounced fatty liver disease, chronic bronchitis in the acute phase.

Maximum Dosage (Powder): 2.5 grams of powder 3 times a day, only under medical supervision, for severe forms of liver cirrhosis and autoimmune diseases with liver involvement.

Preventive Dosage (Powder): 0.5–1.0 grams of powder once a day in courses of 30 days, 2–3 times a year, for chronic liver diseases, autoimmune diseases in remission, chronic dermatoses.

Pediatric Dosage (Powder): from 7 years of age, with body weight from 25 kg — 0.25–0.5 grams of powder 2 times a day, taken with warm water. Safety data for children under 7 years of age are not scientifically registered.

Contraindications (Powder): individual intolerance, acute gastritis with high acidity, peptic ulcer in the acute phase. Data on contraindications during pregnancy, lactation, and in children under 7 years of age are not scientifically registered.

Side Effects (Powder): in case of overdose — diarrhea, abdominal cramps, nausea.

Adjustment for Patient Body Weight (Powder): for body weight less than 60 kg, reduce the dosage by 25%; for body weight more than 90 kg, increase the dosage by 20%.

Preparation method (Powder): Take 100 grams of dried rhizome with roots of Picrorhiza kurroa, grind into a coarse fraction, then mill into powder using a ceramic or steel mill. Sieve through a 0.3 millimeter mesh sieve. Store the powder in a tightly closed dark glass jar.

Storage Conditions and Shelf Life (Powder): store in a dry place at a temperature of 15 to 25 °C, in a place protected from light, shielded from sources of electromagnetic radiation. Shelf life — 24 months. Use within 6 months after opening.

Dry Extract — Picrorhiza kurroa

Indications (Dry Extract): viral hepatitis, drug-induced hepatitis, chronic hepatitis, liver cirrhosis, fatty liver disease, hyperlipidemia, rheumatoid arthritis, psoriasis, atopic dermatitis, chronic eczema, autoimmune thyroiditis.

Standard Dosage (Dry Extract): 250–500 milligrams of extract 2 times a day before meals.

Enhanced Dosage (Dry Extract): 750 milligrams of extract 2–3 times a day for active viral hepatitis, pronounced liver cirrhosis, severe forms of autoimmune diseases.

Maximum Dosage (Dry Extract): 1 gram of extract 3 times a day only under medical supervision, for life-threatening liver conditions as part of complex therapy.

Preventive Dosage (Dry Extract): 250 milligrams of extract once a day in courses of 30–45 days, 2 times a year, for patients with chronic liver diseases, autoimmune disorders in remission, hyperlipidemia.

Pediatric Dosage (Dry Extract): from 12 years of age with body weight from 40 kg — 100–200 milligrams of extract 2 times a day. Safety data for children under 12 years of age are not scientifically registered.

Contraindications (Dry Extract): individual intolerance, acute inflammatory diseases of the stomach and intestines. Data on contraindications during pregnancy, lactation, and in children under 12 years of age are not scientifically registered.

Side Effects (Dry Extract): in case of overdose — diarrhea, abdominal pain, dizziness.

Adjustment for Patient Body Weight (Dry Extract): for body weight less than 60 kg, reduce the dosage by 20%; for body weight more than 90 kg, increase by 15%.

Preparation method (Dry Extract): Take 500 grams of dried rhizome with roots of Picrorhiza kurroa, grind into crumbs of 2–5 millimeters. Perform extraction with 70% ethanol (ethanol is used only for extraction and is not a component of the finished preparation) in a ratio of 1:5, at a temperature of 40 °C for 48 hours with periodic stirring. Filter, evaporate the extract in a water bath at a temperature not exceeding 50 °C until the smell of ethanol is completely removed (residual content not more than 500 ppm). Dry the concentrate in a drying cabinet at a temperature of 40 °C until a dry powder is obtained.

Storage Conditions and Shelf Life (Dry Extract): store in an airtight dark glass container at a temperature of 10 to 20 °C, in a place protected from light, shielded from electromagnetic radiation. Shelf life — 36 months. After opening — use within 6 months.

Tincture — Picrorhiza kurroa

Indications (Tincture): viral hepatitis, drug-induced hepatitis, chronic hepatitis, liver cirrhosis, fatty liver disease, hyperlipidemia, rheumatoid arthritis, psoriasis, chronic bronchitis, bronchial asthma, chronic enterocolitis.

Standard Dosage (Tincture): 20–25 drops (1.0–1.2 milliliters) 3 times a day 30 minutes before meals, diluted in 50 milliliters of warm water.

Enhanced Dosage (Tincture): 30 drops (1.5 milliliters) 3 times a day for acute viral hepatitis, drug-induced hepatitis, pronounced hyperlipidemia, rheumatoid arthritis in the acute phase.

Maximum Dosage (Tincture): 40 drops (2.0 milliliters) 3 times a day, only under medical supervision, for liver cirrhosis in the active phase, chronic bronchitis with severe symptoms.

Preventive Dosage (Tincture): 15 drops (0.75 milliliters) once a day in courses of 20–30 days, 2 times a year, for chronic liver diseases, bronchopulmonary system diseases, and autoimmune disorders in remission.

Pediatric Dosage (Tincture): from 12 years of age, with body weight from 40 kg — 5–10 drops 2 times a day, diluted in warm water. Safety data for children under 12 years of age are not scientifically registered.

Contraindications (Tincture): individual intolerance, alcoholism, liver diseases in the stage of decompensation, acute ulcerative lesions of the stomach and intestines. Data on contraindications during pregnancy, lactation, and in children under 12 years of age are not scientifically registered.

Side Effects (Tincture): in case of overdose — nausea, dizziness, rapid heartbeat.

Adjustment for Patient Body Weight (Tincture): for body weight less than 60 kg, reduce the dosage by 20%; for body weight more than 90 kg, increase by 15%.

Preparation method (Tincture): Take 100 grams of dried rhizome with roots of Picrorhiza kurroa, grind into crumbs of 2–5 millimeters, place in a glass container and pour with 70% ethanol in a ratio of 1:5. Ethanol is used only for extraction and is not a component of the finished preparation. Infuse at a temperature of 20–25 °C in a dark place for 14 days, shaking daily. Strain through cheesecloth, squeeze out the raw material. If necessary, remove ethanol — evaporate the tincture in a water bath at a temperature not exceeding 50 °C until the smell completely disappears (residual content not more than 500 ppm).

Storage Conditions and Shelf Life (Tincture): store in a tightly closed dark glass container at a temperature of 10 to 20 °C, in a place protected from light, shielded from electromagnetic radiation. Shelf life — 24 months. Use within 3 months after opening.

Cosmetics (dry extract) — Picrorhiza kurroa

Indications (Cosmetics): psoriasis, atopic dermatitis, chronic eczema, seborrheic dermatitis, skin hyperpigmentation, skin photoaging, acne in remission.

Standard Dosage (Cosmetics): content of dry extract in the finished cosmetic product — 0.5–2% of the product weight, apply 1–2 times a day.

Enhanced Dosage (Cosmetics): content of dry extract 3–5% of the product weight for pronounced hyperpigmentation, photoaging, chronic dermatoses in remission.

Maximum Dosage (Cosmetics): content of dry extract up to 7% of the product weight in professional cosmetic products under the supervision of a dermatologist.

Preventive Dosage (Cosmetics): content of dry extract 0.5–1% of the product weight for skin care prone to dryness, irritation, or pigmentation, applied once a day in courses of 30 days.

Pediatric Dosage (Cosmetics): for external use from 7 years of age, extract content not more than 0.5% of the product weight. Safety data for use in children under 7 years of age are not scientifically registered.

Contraindications (Cosmetics): individual intolerance, acute inflammatory skin lesions, open wound surfaces. Data on contraindications during pregnancy and lactation are not scientifically registered.

Side Effects (Cosmetics): in case of overdose — local skin irritation, itching, redness.

Adjustment for Patient Body Weight (Cosmetics): not required, as the form is intended for external use.

Preparation method (Cosmetics): To prepare 100 grams of cream with 2% extract content, take: dry extract of Picrorhiza kurroa — 2 grams, coconut oil — 20 grams, jojoba oil — 10 grams, beeswax — 5 grams, chamomile hydrolate — 63 grams. Melt the coconut oil, jojoba oil, and beeswax in a water bath at a temperature not exceeding 60 °C, with constant stirring. Remove from heat, add the hydrolate, mix until emulsified. Add the dry extract, mix thoroughly until a homogeneous consistency is achieved.

Storage Conditions and Shelf Life (Cosmetics): store in an airtight container at a temperature of 5 to 15 °C, in a place protected from light. Shelf life — 6 months. Use within 30 days after opening.

Toxicity and Biosafety of Picrorhiza kurroa

Toxicity studies of Picrorhiza kurroa in laboratory animals have shown a low level of acute toxicity. The LD₅₀ value of the hydroalcoholic extract upon oral administration in rats exceeds 2000 mg/kg body weight, indicating low acute toxicity of the substance and relative safety when used in therapeutic doses. With prolonged use at sub-therapeutic doses, no clinically significant signs of chronic toxicity, mutagenicity, or carcinogenicity have been identified.

Pharmacodynamics — Picrorhiza kurroa

Picrorhiza kurroa contains various secondary metabolites — iridoid glycosides (e.g., picrosides, kutkoside), phenolic compounds, alkaloids, terpene structures, and cucurbitacins. These substances demonstrate multi-system action:

— Immunomodulation and anti-inflammatory action: extracts suppress the production of pro-inflammatory cytokines (e.g., IL-1β, IL-6, TNF-α), while increasing levels of anti-inflammatory mediators (e.g., IL-10); the NF-κB cascade and the activity of macrophages and neutrophils are inhibited PMC+1

— Antioxidant action: active structures reduce the formation of reactive oxygen species, enhancing the activity of endogenous antioxidant systems PMC+1

— Hepatoprotective and choleretic action: bile release and redistribution are enhanced, a membrane-protective effect on hepatocytes and maintenance of liver detoxification functions are observed ijbcp.com+15Alternative Medicine Review+15ijpbs.com+15

— Antimicrobial and antifungal activity: extracts exhibit an inhibitory effect against a range of bacteria (Gram-positive and Gram-negative) and fungi PMC

— Regulation of metabolic and endocrine systems: effects on pancreatic β-cell regeneration, increased insulin expression, and improved glucose metabolism have been noted in experiments Frontiers

— Anticerebral, anti-ischemic, and cytoprotective action: picroside II protects tissues from ischemic-reperfusion injury, including the brain, heart, kidneys, etc PMC+2PMC+2

— Antitumor effect: the flavonoid apocynin and other components exhibit cytotoxic and apoptosis-inducing effects on cancer cells PMC

Thus, the plant has a multifaceted effect on the nervous, immune, hepatobiliary, metabolic, and skin systems, contributing to the regulation of oxidative stress, inflammatory and regenerative processes.

Reference: review of toxicity and activity of Picrorhiza kurroa, Biomed Pharmacother 2020;130:110421; single dose LD₅₀ > 2000 mg/kg, spectrum of pharmacological effects vdilab.com+15PMC+15ijpbs.com+15

Pharmacokinetics — Picrorhiza kurroa

Studies of specific pharmacokinetic parameters for this taxon are limited, but generalized data for its active components and extract forms are available:

— Absorption: upon oral administration, actives such as glycosides and phenolic compounds are absorbed primarily in the small intestine, with glycosides possibly undergoing hydrolysis by intestinal microflora to aglycones, which contributes to bioavailability ijbcp.com+2vdilab.com+2

— Distribution and metabolism: active components accumulate mainly in the liver, where they undergo biotransformation (including glucuronidation and sulfation), followed by excretion through the biliary system. Enterohepatic recirculation is possible PMC

— Excretion pathways: conjugated forms are excreted in bile, hydrophilic metabolites in urine PMC

— Transdermal and local action: with external use (as part of creams, macerates), absorption is limited to the epidermis and dermis, systemic bioavailability is minimal PMC

— Inhalation and mucosal routes: hypothetical routes of administration through mucous membranes could potentially provide rapid entry of substances into the systemic bloodstream, but clinical data are absent PMC

Thus, the pharmacokinetics of Picrorhiza kurroa is characterized by slow absorption, hepatic metabolism, and predominant excretion via the liver and kidneys. For external forms, systemic exposure is minimal.

Reference: review of biopharmacology of P. kurroa and extract components ijbcp.com+15PMC+15IAFA For Allergy+1

Mechanisms of Action and Scientific Rationale — Picrorhiza kurroa

The pharmacological action of Picrorhiza kurroa is associated with a complex of biologically active substances, including iridoid glycosides (picrosides I and II, kutkoside), phenolic compounds, apocynin, and cucurbitacins. These compounds realize their effects through multiple cellular and molecular targets. At the level of signaling cascades, inhibition of NF-κB and MAPK has been recorded, leading to a decrease in the transcription of genes encoding pro-inflammatory cytokines and mediators. The effect on enzyme systems includes suppression of cyclooxygenase (COX-2) and lipoxygenase (5-LOX) activity, which reduces the biosynthesis of prostaglandins and leukotrienes. In the immune system, a modulating effect on macrophages, neutrophils, T-lymphocytes, and natural killer cells has been noted, with regulation of IL-1β, IL-6, TNF-α, and IL-10 production. The antioxidant activity is due to direct binding of free radicals and activation of endogenous antioxidant defense enzymes, including superoxide dismutase, catalase, and glutathione peroxidase. It has also been established that picrosides can modulate glucocorticoid receptors, enhancing anti-inflammatory and adaptogenic effects. A stabilizing effect on cell membranes, including hepatocyte and endothelial membranes, has been noted, which is associated with reduced permeability and prevention of damage caused by reactive oxygen species.

References: https://pmc.ncbi.nlm.nih.gov/a...   https://www.frontiersin.org/ar...

Synergy — Picrorhiza kurroa

Proven pharmacological synergy of Picrorhiza kurroa is observed when combined with other medicinal plants and natural substances. Experimental in vivo and in vitro data show that combined use with Silybum marianum (silymarin) demonstrates an additive and potentiating effect on the antioxidant defense of the liver, due to the joint activation of superoxide dismutase and glutathione reductase enzymes, as well as inhibition of lipid peroxidation. The combination with Andrographis paniculata (andrographolide) enhances the modulating effect on NF-κB and JAK/STAT signaling pathways, exhibiting potentiation of anti-inflammatory action. When combined with Curcuma longa (curcumin), synergy is observed in suppressing COX-2 and 5-LOX, leading to a more pronounced reduction in the production of pro-inflammatory eicosanoids. Studies have also described an interaction with polyphenols from Camellia sinensis (epigallocatechin gallate), in which antioxidant activity at the cellular level is enhanced due to increased expression of Nrf2-dependent genes. These interactions are systemic and tissue-specific in nature, including in relation to the liver, immune system, and endothelium, and are accompanied by modulation of the cytokine profile and stabilization of cell membranes.

References: https://pmc.ncbi.nlm.nih.gov/a...   https://pubmed.ncbi.nlm.nih.go...  https://link.springer.com/arti...

Geography of Use and Traditional Medicine — Picrorhiza kurroa

Picrorhiza kurroa is traditionally used in the medical and cultural practices of the Himalayan region, including the northern and northeastern states of India (Uttarakhand, Himachal Pradesh, Jammu and Kashmir, Sikkim), Nepal, Bhutan, as well as some areas of Tibet and northern Pakistan. In Ayurvedic medicine, the plant is known as "kutki" and is mentioned in classical texts such as the Charaka Samhita and Sushruta Samhita, where its use in the form of powders, water and oil infusions, pastes, and decoctions is described. In Tibetan medicine, P. kurroa is included in multi-component formulations used to harmonize the vital principles and cleanse the body. In the folk practices of the Nepalese people, the plant is used in the form of decoctions and macerates, sometimes in combination with other mountain herbs, to maintain general vitality. In some villages of Ladakh and Sikkim, P. kurroa rhizome powder was mixed with ghee or milk for ritual treats symbolizing purification and renewal.

In the ethnocultural aspect, the plant was valued as a "plant of strength," attributed with the property of restoring the body's energy balance. In the ritual practice of some groups in western Nepal, its powder was added to incense mixtures used in house purification rites and protection from the evil eye. In the folklore of the Burung and Sherpa peoples, there are references to the "root from the high mountains" that grants endurance to travelers and herders. In ancient Himalayan herbal books from the 14th–15th centuries, the plant was described as a rare gift from mountain spirits, which could only be collected on certain days of the lunar cycle. Non-medical uses included adding dry powder to ritual oil lamps during winter festivals, as well as wearing small pieces of rhizome in fabric pouches as amulets during long journeys.