Picrorhiza Scrophulariiflora (Picrorhiza scrophulariiflora): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Picrorhiza protect the liver?

Picrorhiza contains iridoid glycosides called picrosides I and II, along with kutkin, which provide hepatoprotective effects through multiple mechanisms. These compounds act as potent antioxidants that neutralize free radicals and reduce oxidative stress in liver cells. They also inhibit inflammatory pathways, stimulate liver cell regeneration, and promote bile flow (choleretic effect). Additionally, these compounds may help stabilize cell membranes against toxin damage. Evidence for these mechanisms comes primarily from in vitro and animal studies, with human clinical evidence rated at Level C (preliminary findings requiring further confirmation).

Does Picrorhiza interact with any medications?

Picrorhiza may interact with immunosuppressive medications due to its immune-stimulating properties, potentially reducing drug effectiveness. This is particularly concerning for transplant patients taking cyclosporine, tacrolimus, or prednisone. The herb may also influence liver enzyme activity, potentially altering metabolism of drugs processed by the liver. Patients on diabetes medications should monitor blood sugar closely, as Picrorhiza may affect glucose levels. Always consult a healthcare provider before combining Picrorhiza with prescription medications. Evidence level: C, based primarily on theoretical concerns and animal data.

What is the recommended dosage for Picrorhiza extract?

The standard adult dosage for Picrorhiza scrophulariiflora is 200–400mg of standardized extract daily, typically standardized to contain picrosides or kutkin. For powdered root preparations, 500–1500mg daily in divided doses is traditionally used. Picrorhiza is intensely bitter, so capsules are often preferred over teas or tinctures. Due to limited human clinical data (Evidence Level C), these recommendations are based primarily on traditional use and animal studies. Start with lower doses to assess tolerance, as higher doses may cause gastrointestinal upset including nausea and diarrhea.

Is Picrorhiza safe to take during pregnancy?

Picrorhiza scrophulariiflora is considered unsafe during pregnancy and should be strictly avoided. The herb has emmenagogue properties that may stimulate uterine contractions and potentially cause miscarriage. There is insufficient safety data for breastfeeding, so nursing mothers should also avoid this herb. Additionally, Picrorhiza's immune-stimulating effects could pose theoretical risks during pregnancy when immune modulation is critical for fetal development. Women who are pregnant, planning pregnancy, or breastfeeding should not use Picrorhiza without explicit guidance from a qualified healthcare provider.

Can people with autoimmune diseases take Picrorhiza?

People with autoimmune conditions such as lupus, rheumatoid arthritis, multiple sclerosis, or Hashimoto's thyroiditis should avoid Picrorhiza. The herb stimulates immune function, which may worsen autoimmune symptoms or trigger disease flares. This immune-stimulating effect, while beneficial for some purposes, contradicts the immune-modulating or suppressing approach typically needed in autoimmune management. Patients with autoimmune conditions should consult a qualified healthcare provider before considering Picrorhiza. This contraindication is based on the herb's pharmacological mechanism rather than extensive clinical studies (Evidence Level C).

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Picrorhiza scrophulariiflora is a medicinal herb endemic to the Himalayan region known for its iridoid glycosides and various pharmacological activities [PMID:36184806, PMID:34951239].

Background

Picrorhiza scrophulariiflora is a species of the Scrophulariaceae family endemic to the Himalayan region [PMID:36184806]. It is categorized as endangered by the International Union for Conservation of Nature and Natural Resources (IUCN) due to unregulated wild harvesting and narrow distribution [PMID:36184806].

Traditional uses

The herb has been traditionally used to treat inflammatory diseases [PMID:19178960, PMID:19066289], as well as tumors and liver infections [PMID:19694604]. It is also traditionally utilized as an antioxidant and anti-inflammatory agent [PMID:37192720].

Active compounds

The plant contains iridoid glycosides (including picrosides I, II, III, and IV, minecoside, and sweroside) [PMID:21413048, PMID:37570895, PMID:9654780], tetracyclic triterpenoids, phenylpropanoids, and phenylethanoid glycosides [PMID:34951239]. Specific isolated compounds include cucurbitane glycosides [PMID:38812200], cyclopentanoid monoterpenes (piscrocins and neopiscrocins) [PMID:15095161, PMID:39329329], and caffeoyl glycosides (scrocaffesides A-C) [PMID:18463574].

Mechanism of action

Mechanisms include the inhibition of redox-sensitive inflammation to improve atherosclerosis [PMID:19178960], blocking the TSP1/TNF/NF-κB axis to ameliorate acute liver injury [PMID:42190414], and targeting acyl-CoA oxidase 1 (Acox1) to influence lipid metabolism and ATP production in NASH [PMID:39524810]. Picroside III promotes AMPK phosphorylation to protect intestinal barrier integrity [PMID:37218365], while Picroside II acts via the AMPK-FXR pathway to protect against cholestasis [PMID:32976922].

Clinical evidence

Evidence DNon-alcoholic steatohepatitis (NASH)

Total iridoid glycosides and total glucosides decreased hepatic steatosis, lowered serum triglycerides and total cholesterol, and suppressed pro-inflammatory cytokines in rat and mouse models [PMID:36117562, PMID:39524810].

Evidence DColitis

Picroside III and glycosidic fractions alleviated clinical signs of colitis (body weight loss, colon shortening) and protected intestinal barrier integrity in mice and Caco-2 cells [PMID:37218365, PMID:37249930].

Evidence DAtherosclerosis

Ethanol extract significantly decreased accelerated atherosclerosis induced by AGEs or AOPPs in rabbits [PMID:19178960].

Evidence DDiabetic Nephropathy

Ethanol extract reduced renal macrophage infiltration and overexpression of CCL2 and TGFB1 in streptozotocin-induced diabetic rats [PMID:19066289].

Evidence DAcute Liver Injury

Ethanol extract ameliorated CCl4-induced acute liver injury in mouse models and HepG2 cells [PMID:42190414].

Evidence D

Safety & adverse effects

Four isolated cucurbitane glycosides showed no significant cytotoxicity against four tumor cell lines (half inhibitory concentrations exceeded 100 μmol/L) [PMID:38812200].

Drug interactions

Research has investigated the effects of Picroside II on cytochrome P450 (CYP) enzymes in vitro and in vivo to assess potential herb-drug interactions [PMID:37192720].

Evidence summary

The current evidence consists primarily of in vitro studies and animal models (rats, mice, rabbits), indicating a strength of evidence level D. No human clinical trials were provided.

PubMed sources

1.PMID: 38812200 (2024) — [A new cucurbitane glycoside from Picrorhiza scrophulariiflora]. · Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica
2.PMID: 21413048 (2012) — TLC densitometric quantification of picrosides (picroside-I and picroside-II) in Picrorhiza kurroa and its substitute Picrorhiza scrophulariiflora and their antioxidant studies. · Biomedical chromatography : BMC
3.PMID: 36184806 (2022) — Iridoid glycosides from Picrorhiza genus endemic to the Himalayan region: phytochemistry, biosynthesis, pharmacological potential and biotechnological intercessions to boost production. · Critical reviews in biotechnology
4.PMID: 34951239 (2021) — [Advances in research on chemical composition of Picrorhiza scrophulariiflora and P. kurroa and their biological activities]. · Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica
5.PMID: 19178960

Picrorhiza Scrophulariiflora

Sources & Citations

Calculate a safe dose of Picrorhiza Scrophulariiflora

Pterocarpus santalinus

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Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Drug interactions

Evidence summary

PubMed sources

Government sources

Picrorhiza Scrophulariiflora

Sources & Citations

Calculate a safe dose of Picrorhiza Scrophulariiflora

Related Herbs

Pterocarpus santalinus

Kutki Tibetan

Frangipani

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Drug interactions

Evidence summary

PubMed sources

Government sources