Linaria vulgaris (Linaria vulgaris): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Linaria vulgaris work medicinally?

Linaria vulgaris contains active compounds such as linarin, aucubin, peganine, and flavonoids which contribute to its medicinal actions. Linarin and flavonoids are associated with hepatoprotective effects, supporting liver and gallbladder function. Aucubin offers anti-inflammatory properties, which may explain the herb's traditional topical application for skin conditions and hemorrhoids. Peganine is believed to contribute to the plant's diuretic activity. These mechanisms are derived from phytochemical analysis rather than extensive clinical trials (Evidence Level C).

Is Linaria vulgaris safe to take during pregnancy?

No, Linaria vulgaris is considered unsafe during pregnancy. The herb contains constituents that may stimulate uterine contractions or cause fetal toxicity. Additionally, its diuretic effects can disrupt fluid and electrolyte balance, which is risky during gestation. Due to these potential dangers and a lack of safety data, this herb is contraindicated for pregnant women and should be strictly avoided. It is also not recommended for children under 12 years of age (Evidence Level C).

Does Linaria vulgaris interact with any medications?

Linaria vulgaris may interact with diuretic medications (water pills) and antihypertensive drugs. Because the herb possesses diuretic properties, taking it alongside prescription diuretics like furosemide may potentiate effects, leading to dehydration or hypotension. Additionally, due to its traditional use for liver support, there is a theoretical risk that it may alter the metabolism of drugs processed by the liver. Patients taking prescription medications should consult a healthcare provider before use (Evidence Level D).

What is the recommended dosage for Linaria vulgaris tea?

The traditional adult dosage for Linaria vulgaris tea is 1 to 2 teaspoons of dried herb per cup of boiling water, taken twice daily. Users should not exceed this recommended amount due to the risk of gastrointestinal irritation. Because clinical safety data is limited, usage should be restricted to short-term durations. If adverse reactions occur, discontinue use immediately (Evidence Level C/Traditional).

What are the traditional uses of Linaria vulgaris?

Linaria vulgaris, also known as common toadflax, has been used in European folk medicine primarily for liver complaints and gallbladder support. It is traditionally employed as a diuretic to promote urine flow and is applied externally or taken internally for skin conditions and hemorrhoids. While the plant contains bioactive compounds like linarin and aucubin, modern clinical evidence supporting these specific uses is limited (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

Linaria vulgaris, also known as common toadflax, is a plant containing flavonoids and alkaloids that have demonstrated lipid-lowering, neuroprotective, and allergy-preventive effects in experimental models [PMID:28770537, 29468577, 38001861].

Background

Linaria vulgaris (common toadflax) is a member of the Plantaginaceae family [PMID:39257915]. It is characterized by zygomorphic flowers with nectar spurs, though a known radial-symmetry mutant called 'Peloria' exists due to heritable methylation of the Lcyc gene [PMID:10684579, 10490023, 34403807]. The species is noted for natural horizontal gene transfer from Agrobacterium rhizogenes into its genome [PMID:23134518, 25157257, 25420106].

Traditional uses

In Russian traditional medicine, Linaria vulgaris tincture has been used to treat hangover symptoms, including headache, vertigo, and drunken behaviors, and has been used as a sedative [PMID:30287194].

Active compounds

Identified compounds include flavonoids such as pectolinarigenin and acetylpectolinarin [PMID:30287194, 36415143], the alkaloid linarinic acid (1,2,3,9-tetrahydropyrrolo[2,1-b]quinazoline-1-carboxylic acid) [PMID:12372872, 29468577], iridoids (antirrinoside, antirride, 6-beta-idrossiantirride, 10-beta-glucosilaucubina, and 4-carboxy-boonein) [PMID:17987503], and linarin [PMID:18569715].

Mechanism of action

Pectolinarigenin inhibits fatty acid biosynthesis by downregulating genes such as ACACA, FASN, and HMGCR, while upregulating PPARGC1B and CPT1A [PMID:36415143]. In motor neuron cells, pectolinarigenin enhances mitochondrial fusion via the SIRT3/OPA1 axis to reduce oxidative stress and apoptosis [PMID:38001861].

Clinical evidence

Evidence DHyperlipidemia and Hepatic Steatosis

Flavonoids from L. vulgaris ssp. sinensis significantly reduced serum levels of AST, ALT, TC, TG, LDL-C, and free fatty acids, and improved hepatic architecture in mice fed a western-type diet [PMID:28770537]

Evidence DAllergic Reactions

Linarinic acid and its tetrahydropyrrolo[2,1-b]quinazoline derivatives showed significant allergy-preventive activities in a mouse model of lysozyme sensitization [PMID:29468577]

Evidence DMotor Neuron Degeneration (C9-ALS model)

Pectolinarigenin demonstrated neuroprotective effects by reducing ROS production and apoptosis in mouse NSC-34 motor neuron cell lines [PMID:38001861]

Evidence summary

The current evidence is based on in vitro studies and animal models (mice); there are no human clinical trials provided in the abstracts.

PubMed sources

1.PMID: 39257915 (2023) — The genome sequence of the common toadflax, Linaria vulgaris Mill., 1768. · Wellcome open research
2.PMID: 29500560 (2018) — Agrobacterium-Mediated Transformation in the Evolution of Plants. · Current topics in microbiology and immunology
3.PMID: 25157257 (2014) — Horizontal gene transfer from Agrobacterium to plants. · Frontiers in plant science
4.PMID: 10684579 (2000) — Evolutionary developmental genetics of floral symmetry: the revealing power of Linnaeus' monstrous flower. · BioEssays : news and reviews in molecular, cellular and developmental biology
5.PMID: 37426957 (2023) — How do you build a nectar spur? A transcriptomic comparison of nectar spur development in Linaria vulgaris and gibba development in Antirrhinum majus.

Linaria vulgaris

Sources & Citations

Calculate a safe dose of Linaria vulgaris