Hermetica Superfood Encyclopedia
The Short Answer
Cleavers contains iridoid glycosides (asperuloside, asperulosidic acid, aucubin), hydroxycinnamic derivatives, condensed tannins, flavonoids (quercetin, luteolin, rutin), and triterpenoids (oleanolic and ursolic acids) that collectively drive lymphocyte proliferation, antioxidant scavenging, and cytotoxic activity against cancer cell lines. In vitro aqueous extracts at 250 µg/mL stimulated lymphocyte blast transformation to 1.36 times the activity of the phytohaemagglutinin (PHA) reference standard, and methanolic extracts selectively induced apoptosis in MDA-MB-231 triple-negative breast cancer cells and G1 cell cycle arrest in MCF-7 cells at 72 hours, without measurable toxicity to healthy breast epithelial cells.
CategoryHerb
GroupEuropean
Evidence LevelPreliminary
Primary Keywordcleavers herb benefits
Cleavers — botanical close-up
Health Benefits
**Lymphatic and Immune Stimulation**
Aqueous infusions and ethanolic extracts stimulate lymphocyte blast transformation in vitro, with the butanol-enriched phenolic fraction achieving 1.36-fold immunostimulation over the PHA reference at 250 µg/mL, consistent with traditional use as a lymphatic tonic.
**Antioxidant Activity**: Hydroxycinnamic derivatives (quantified at 18
7 µg/mg in raw infusion; up to 91.2 mg/g in 96% EtOH extract) and flavonoids (quercetin, rutin, luteolin) confer significant free-radical scavenging capacity, reducing oxidative burden on lymphatic and renal tissues.
**Selective Cytotoxicity Against Cancer Cell Lines**
Methanolic extracts induce apoptosis in MDA-MB-231 triple-negative breast cancer cells, necrosis in MCF-7 ER-positive cells, and G1-phase cell cycle arrest, while sparing normal epithelial cells across tested concentrations up to 72-hour exposure.
**Diuretic and Renoprotective Support**
Traditional and ethnobotanical records consistently document use as a diuretic and renal trophorestorative; triterpenoids such as oleanolic and ursolic acids, known to modulate renal tubular function in other Rubiaceae family members, are candidate actives.
**Depurative and Anti-inflammatory Potential**
Condensed tannins (up to 5% dry weight), phenolic acids (caffeic, gallic, p-coumaric, salicylic), and squalene contribute to anti-inflammatory and tissue-cleansing activity, supporting traditional use as a blood and tissue depurative.
**Polysaccharide-Mediated Immunomodulation**: The 20% EtOH extract yields 129.4 ± 1.6 mg/g polysaccharides
among the highest of all extract types — and aqueous infusions contain 96.3 µg/mg polysaccharides; these fractions may activate macrophages and lymphocytes via pattern-recognition receptor engagement analogous to other immunostimulant plant polysaccharides.
**Alkaloid-Associated Neuroprotective Potential**: The presence of β-carboline alkaloids harmine and (±)-vasicinone
known acetylcholinesterase inhibitors and MAO-A inhibitors in other botanical contexts — hints at potential neuroprotective or neurological activity, though this has not been directly studied in Galium aparine.
Origin & History
Natural habitat
Galium aparine is a sprawling annual herb native to Europe, North Africa, and temperate Asia, naturalised widely across North America and Australasia. It thrives in hedgerows, woodland margins, disturbed ground, and fertile, moist soils at low to moderate elevations, often climbing through shrubs via its hook-covered stems and leaves. Aerial parts — stems, leaves, and immature fruits — are harvested in spring before flowering, when iridoid and phenolic concentrations are highest.
“Galium aparine has been documented in European herbal medicine since at least the first century CE, referenced by Dioscorides in De Materia Medica as a remedy for fatigue, snake bite, and urinary conditions. In British folk medicine — particularly within the hedgerow herbalism tradition — cleavers was regarded as the premier spring lymphatic tonic and blood cleanser, consumed as a cold-pressed juice of fresh herb or infusion to 'cleanse the lymph' following winter, a practice codified by herbalists Nicholas Culpeper (1653) and later Matthew Wood in contemporary phytotherapy. It was employed across Germanic, Scandinavian, and Eastern European traditions as a diuretic, depurative, and treatment for skin diseases, glandular swellings, and urinary gravel, reflecting a pan-European consensus on its lymphatic and renal affinity. The clinging, velcro-like stems also gave rise to domestic uses — the herb was historically used to strain milk in dairies — and the roasted fruits were used as a caffeine-free coffee substitute, demonstrating the breadth of its cultural integration beyond strictly medicinal roles.”Traditional Medicine
Scientific Research
The evidence base for Galium aparine consists entirely of in vitro preclinical studies; no human clinical trials, randomised controlled trials, or controlled observational studies have been published as of the most recent literature search. Key in vitro findings include: immunostimulation quantified as 1.36-fold above PHA reference at 250 µg/mL for aqueous infusion fractions; selective cytotoxicity in MDA-MB-231 and MCF-7 breast cancer cell lines with preserved viability in healthy epithelial controls over 72-hour exposure; and comparative phytochemical profiling across five extract types (20%, 60%, 96% EtOH, raw infusion, lipophilic complex) characterising yields of polysaccharides, hydroxycinnamic derivatives, flavonoids, and polyphenols. Chromatography-mass spectrometry identified 36 compounds in the lipophilic complex (3.02% yield), with iridoids, triterpenoids, alkaloids, and sterols fully catalogued. The overall evidence quality is low-to-preliminary: mechanistic hypotheses are extrapolated from isolated compound data in other species, sample sizes are limited to cell-line models, and traditional use claims remain clinically unvalidated.
Preparation & Dosage
Traditional preparation
**Tincture (Standard)**
4–8 mL three times daily (12–24 mL/day total), the most cited traditional therapeutic dose
1:5 ratio in 25% ethanol; .
**Aqueous Infusion (Tea)**
Fresh or dried aerial parts steeped in hot water; yields 96.3 µg/mg polysaccharides and 18.7 µg/mg hydroxycinnamic derivatives per mg dried herb; consumed 2–3 cups daily in traditional British herbalism.
**20% Ethanolic Extract**
4 mg/g polysaccharides and 75
Yields 129..9 mg/g hydroxycinnamic derivatives; preferred for immunostimulant applications where polysaccharide content is prioritised.
**96% Ethanolic Extract**
3 mg/g) and hydroxycinnamic derivative (91
Highest flavonoid (15..2 mg/g) content; preferred for antioxidant and cytotoxic applications; yield 163.4 mg/mL.
**Lipophilic Complex**
3.02% extraction yield; contains carotenoids, squalene, sterols, and 36 chromatographically identified compounds; used in standardised phytopharmaceutical research preparations.
**Phenolic-Polysaccharide Concentrates (PPC/PSC)**
Post-infusion residue processing yields concentrated fractions for experimental use; not widely available commercially.
**Harvest Timing**
Aerial parts harvested pre-flower in spring for maximum iridoid and phenolic content; dried below 40°C to preserve thermolabile glycosides.
**Standardisation**
No internationally accepted standardisation benchmark exists; research preparations are characterised by hydroxycinnamic derivative content (as chlorogenic acid equivalent) or total polyphenol content (as gallic acid equivalent).
Nutritional Profile
Galium aparine aerial parts contain a complex phytochemical matrix rather than significant macronutrient density. Condensed tannins reach up to 5% dry weight, contributing astringency and antioxidant activity. Polysaccharides are abundant: 96.3 µg/mg (9.63% dry weight) in aqueous infusion, rising to 129.4 mg/g in 20% ethanolic extract. Hydroxycinnamic derivatives (chlorogenic acid equivalents) range from 18.7 µg/mg in infusion to 91.2 mg/g in 96% EtOH extract. Flavonoids (quercetin, rutin, luteolin, hesperidin, quercetin 3-O-rhamnoglucoside-7-O-glucoside) average 2.6 µg/mg in infusion and up to 15.3 mg/g in 96% EtOH extract. Phenolic acids include caffeic, p-coumaric, gallic, p-hydroxybenzoic, salicylic, and citric acids. The lipophilic fraction (3.02% yield) contains chlorophylls, carotenoids, squalene, and phytosterols (sitosterol, stigmasterol, campesterol, avenasterol). Iridoids (asperuloside, asperulosidic acid, aucubin, monotropein, acumine) and alkaloids (harmine, protopine, vasicinone) are present at pharmacologically relevant but unquantified concentrations in the current literature. Bioavailability of iridoid glycosides is expected to be moderate, subject to intestinal hydrolysis to aglycones; flavonoid bioavailability is extraction-method dependent, with ethanolic extracts delivering higher aglycone fractions.
How It Works
Mechanism of Action
The immunostimulatory activity of Galium aparine extracts is primarily attributed to phenolic compounds — especially hydroxycinnamic derivatives and flavonoids — in the butanol fraction, which stimulate lymphocyte proliferation (blast transformation), likely via toll-like receptor or lectin-independent mitogenic pathways, as evidenced by activity superior to PHA at 250 µg/mL in vitro. Iridoid glycosides, particularly asperuloside and aucubin, are known across the Rubiaceae family to modulate NF-κB signalling and inflammatory cytokine production, although specific pathway confirmation in Galium aparine has not yet been published. Methanolic extract cytotoxicity in breast cancer cell lines (apoptosis in MDA-MB-231; necrosis and G1 arrest in MCF-7 at 72 hours) suggests interference with cell cycle checkpoints — potentially via p21/Cdk2 modulation or mitochondrial apoptotic pathway activation — consistent with the bioactivity of constituent triterpenoids (oleanolic and ursolic acids) and flavonoids (quercetin, luteolin) documented in mechanistic studies on those isolated compounds. Antioxidant scavenging by hydroxycinnamic derivatives and polyphenols likely operates through hydrogen-atom transfer and single electron transfer mechanisms, reducing reactive oxygen species available to promote lymphatic and renal tissue damage.
Clinical Evidence
No human clinical trials for Galium aparine exist in the published literature. All quantified efficacy data derive from in vitro cell-based assays: lymphocyte blast transformation assays measured immunostimulation at 1.36× PHA activity (250 µg/mL aqueous extract), and breast cancer cell line experiments documented apoptosis, necrosis, and G1 arrest without healthy-cell toxicity at 72 hours. Pharmacokinetic parameters, bioavailability, effective human doses, and patient-relevant outcomes (e.g., lymphoedema reduction, urinary output, infection rates) remain entirely unstudied in human subjects. Confidence in clinical efficacy is therefore very low; the herb's continued therapeutic use rests on centuries of traditional practice rather than controlled clinical evidence.
Safety & Interactions
Human safety data for Galium aparine are absent from the published clinical literature; all available toxicity assessments are limited to in vitro cell-line studies in which methanolic and aqueous extracts showed no measurable cytotoxicity toward normal breast epithelial cells at tested concentrations over 72-hour exposure. Theoretical caution is warranted for individuals taking diuretic pharmaceuticals (thiazides, loop diuretics) or anticoagulants, as the herb's diuretic activity and salicylic acid content could potentiate fluid loss and platelet aggregation inhibition respectively, though direct pharmacokinetic interaction data do not exist. The presence of condensed tannins at up to 5% dry weight may reduce iron and certain mineral absorption if consumed chronically or in high doses, and could theoretically interact with iron supplementation or tetracycline-class antibiotics. Pregnancy and lactation safety is unestablished; given the traditional classification as a uterine stimulant in some European folk systems and the complete absence of reproductive toxicology data, use during pregnancy and breastfeeding is not recommended pending further research.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Galium aparineGoosegrassSticky WillyCatchweed BedstrawGrip GrassCoachweed
Frequently Asked Questions
What is cleavers herb used for?
Cleavers (Galium aparine) is used primarily as a lymphatic tonic, diuretic, and depurative in British and European herbal medicine. In vitro evidence supports immunostimulant activity — aqueous extracts stimulate lymphocyte proliferation to 1.36 times the activity of the PHA reference standard at 250 µg/mL — and the herb has traditionally been taken as a spring tonic to support lymphatic drainage, kidney function, and skin clarity.
What is the standard dosage for cleavers tincture?
The standard traditional dosage is 4–8 mL of a 1:5 tincture in 25% ethanol, taken three times daily, equating to 12–24 mL per day total. Fresh-herb aqueous infusions (tea) are consumed at 2–3 cups daily in British folk practice. No clinical trial data exist to confirm or refine these doses in human subjects.
Does cleavers have any scientific evidence behind it?
Evidence is limited to in vitro (cell and blood-based) studies only; no human clinical trials have been published. Key findings include 1.36-fold immunostimulation of lymphocytes versus PHA reference at 250 µg/mL, and selective cytotoxicity toward MDA-MB-231 and MCF-7 breast cancer cell lines without toxicity to healthy epithelial cells. The overall evidence score is preliminary, and clinical efficacy in humans remains unproven.
Is cleavers safe to take, and are there any drug interactions?
Human safety data are absent; in vitro studies found no toxicity to normal cells at tested concentrations. Theoretical interactions include potentiation of diuretic pharmaceuticals (thiazides, furosemide) due to additive fluid loss, and possible reduction of iron or tetracycline absorption due to high tannin content (up to 5% dry weight). Pregnancy and lactation use is not recommended given the complete absence of reproductive safety data.
What are the key active compounds in cleavers?
The primary bioactives are iridoid glycosides (asperuloside, asperulosidic acid, aucubin, monotropein), hydroxycinnamic derivatives (quantified at 18.7–91.2 mg/g depending on extract), flavonoids (quercetin, rutin, luteolin, hesperidin), condensed tannins (up to 5% dry weight), and triterpenoids (oleanolic and ursolic acids, betulin, lupeol). The herb also contains β-carboline alkaloids (harmine, protopine), phytosterols, carotenoids, squalene, and polysaccharides (up to 129.4 mg/g in 20% ethanolic extract).
What is the difference between cleavers infusion and tincture for lymphatic support?
Cleavers infusions (water-based) are traditionally preferred for lymphatic stimulation and are the form most studied for immune effects, with aqueous extracts demonstrating measurable lymphocyte activation in research. Tinctures (alcohol-based) may offer better preservation and convenience but may not capture the full spectrum of water-soluble polysaccharides and mucilage compounds that support lymphatic function, making infusions the more traditional choice for this specific use.
Is cleavers safe to use long-term as a daily lymphatic tonic?
Cleavers is generally considered safe for extended use as a gentle lymphatic herb when taken as a dilute infusion, though clinical data on long-term supplementation remains limited. Some herbalists recommend periodic breaks (such as 5 days on, 2 days off) to maintain sensitivity, and individuals with existing kidney conditions should consult a practitioner before prolonged use, as cleavers traditionally acts as a diuretic.
How does the antioxidant activity of cleavers compare to its immunostimulant effects?
While cleavers contains hydroxycinnamic acid derivatives with measurable antioxidant capacity, its primary documented mechanism is lymphocyte stimulation (1.36-fold immunostimulation in vitro), suggesting immune modulation is its more clinically relevant action. The antioxidant compounds likely support overall cellular health and reduce inflammatory stress in the lymphatic system rather than serving as the herb's primary therapeutic driver.
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