Lady's Bedstraw (Galium verum): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Lady's Bedstraw work as a diuretic?

Lady's Bedstraw (Galium verum) contains active compounds including asperuloside, flavonoids, and tannins that support its diuretic action. The herb promotes kidney function and increases urine output, helping eliminate excess fluids from the body. Asperuloside, an iridoid glycoside found in the plant, is considered the primary compound responsible for the lymphatic and diuretic effects. Evidence level: C (traditional use with some pharmacological data supporting mechanism).

Does Lady's Bedstraw interact with any medications?

Currently, there are no well-documented drug interactions for Lady's Bedstraw. However, due to its diuretic properties, it may theoretically enhance the effects of prescription diuretic medications such as furosemide or hydrochlorothiazide, potentially leading to dehydration or electrolyte imbalances. Those taking lithium should exercise caution, as increased urination could affect lithium levels. Always consult a healthcare provider before combining herbal supplements with prescription medications. Evidence level: C.

What is the recommended dosage for Lady's Bedstraw?

The typical adult dosage for Lady's Bedstraw is 3-5 grams of dried herb prepared as a tea, or 2ml of tincture taken daily. To make a tea, steep the dried herb in hot water for 10-15 minutes before straining. For tincture preparations, follow manufacturer instructions or consult a qualified herbalist. These recommendations are based on traditional use rather than clinical trials. Evidence level: C. Always start with lower doses to assess tolerance.

Is Lady's Bedstraw safe during pregnancy?

Lady's Bedstraw is generally considered safe during pregnancy when used in recommended amounts. The herb has a long history of traditional use without significant adverse effects reported for pregnant women. However, as with any herbal supplement during pregnancy, it is advisable to consult a healthcare provider or qualified herbalist before use. No specific contraindications have been identified for pregnant women. Evidence level: C (based on traditional use rather than clinical studies).

What is Lady's Bedstraw used for medicinally?

Lady's Bedstraw has been used traditionally as a diuretic tonic, for lymphatic system support, and to address urinary complaints such as cystitis and water retention. In folk medicine, it has also been historically used for epilepsy, though this application lacks scientific validation. The herb's lymphatic properties may help support the body's natural detoxification processes. Historically, it was also used to curdle cheese and stuff mattresses due to its pleasant scent. Evidence level: C.

What are the side effects of Lady's Bedstraw?

Lady's Bedstraw is generally well-tolerated with few reported side effects. The most commonly noted adverse effect is rare skin sensitization, which may cause contact dermatitis in susceptible individuals when handling the fresh plant. No significant contraindications exist for this herb. Those with known allergies to plants in the Rubiaceae family, such as cleavers or coffee, should exercise caution. Evidence level: C. Discontinue use if any adverse reactions occur and seek medical advice.

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

Galium verum, known as Lady's Bedstraw, is a perennial herb with recognized antioxidant, cardioprotective, and antimicrobial properties [PMID:40333892, 30632812].

Background

Galium verum (Yellow Bedstraw) is a rhizomatous perennial herb of the Rubiaceae family, native to Eurasia and Africa, and introduced to southern Canada and the northern U.S. [PMID:40333892].

Traditional uses

It has been widely used in traditional medicine for its diuretic, anti-inflammatory, antimicrobial, analgesic, and anticancer properties [PMID:40333892]. It is also traditionally used in cheese-making due to its milk-clotting enzymes [PMID:29339117] and as an anticancer decoction applied internally and externally [PMID:25017936, 24366449].

Active compounds

The plant is rich in flavonoids (including diosmetin, rutin, quercetin, and kaempferol), phenolic acids (chlorogenic, caftaric, and gallic acids), iridoids (notably asperuloside), anthraquinones, phytosterols, coumarins, and tannins [PMID:40333892, 36985838, 39253919, 20209910].

Mechanism of action

G. verum exhibits strong antioxidant activity that protects cells from oxidative stress and inflammation [PMID:40333892]. It modulates the activity of antioxidant enzymes and alleviates the production of pro-oxidants [PMID:30632812]. In cancer cells, sublethal doses act as inhibitors of motility by upregulating TIMP-1 and downregulating MMP-2 [PMID:25017936, 24366449].

Clinical evidence

Evidence DCardiotoxicity (Doxorubicin-induced)

Methanol extract (50 mg/kg/day for 14 days in rats) effectively suppressed disturbed heart response to perfusion pressure changes and reduced prooxidants [PMID:37372007]

Evidence DMyocardial Ischemia/Reperfusion Injury

Methanol extract (500 mg/kg for 28 days in hypertensive rats) preserved cardiac contractility, systolic and diastolic function, and reduced structural damage [PMID:30632812, 30863479]

Evidence DHypertension

An oral liquid formulation of ethanol extract effectively reduced blood pressure in spontaneously hypertensive rats [PMID:39125920]

Evidence DAphthous Stomatitis

A mucoadhesive oral gel based on ethanol extract significantly decreased ulcer size in rats [PMID:35897855]

Evidence DPsoriasis

Extract administration (125 mg/kg for 4 weeks in rats) mitigated cardiovascular events and showed therapeutic potential in imiquimod-induced models [PMID:39894905, 40806422]

Evidence D

Safety & adverse effects

In vitro assessments on myoblasts and in ovo on chorioallantoic membranes were conducted to assess the biosafety profile [PMID:40061279].

Evidence summary

The current evidence is based primarily on in vitro studies and animal models (rats), indicating strong antioxidant and cardioprotective potential, but lacks human clinical trials.

PubMed sources

1.PMID: 37372007 (2023) — Lady's Bedstraw as a Powerful Antioxidant for Attenuation of Doxorubicin-Induced Cardiotoxicity. · Antioxidants (Basel, Switzerland)
2.PMID: 40333892 (2025) — A Review of Phytochemical and Pharmacological Studies on Galium verum L., Rubiaceae. · Molecules (Basel, Switzerland)
3.PMID: 39125920 (2024) — Hypotensive and Cardioprotective Potential of Yellow Bedstraw Extract-Based Oral Liquid in Spontaneously Hypertensive Rats. · International journal of molecular sciences
4.PMID: 36985838 (2023) — Phytochemical Screening and Antioxidant Activity of Selected Estonian Galium Species. · Molecules (Basel, Switzerland)
5.PMID: 18636371 (2008) — Flavonoids from Galium verum L. · Journal of Asian natural products research

Lady's Bedstraw

Sources & Citations

Calculate a safe dose of Lady's Bedstraw

Ligusticum Chuanxiong Herb

Heal All Spica

Alpinia zerumbet

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources

Lady's Bedstraw

Sources & Citations

Calculate a safe dose of Lady's Bedstraw

Related Herbs

Ligusticum Chuanxiong Herb

Heal All Spica

Alpinia zerumbet

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources