Cleavers
A traditional lymphatic and urinary herb. Its entire published literature is laboratory work on extracts; nothing has been tested in humans for any indication.
Evidence last reviewed: August 2026
What the science says
- Lymphatic and urinary use is traditional only Limited evidence
No human trial of Galium aparine exists for lymphatic drainage, swelling, or urinary flow. The published research is confined to bioactivity screening of extracts, such as antimicrobial and antioxidant characterisation in vitro.
- In-vitro antimicrobial and wound-healing activity Limited evidence
Laboratory studies report antimicrobial and antioxidant activity and effects in an in-vitro scratch wound-healing assay. Cell-culture activity of a crude plant extract is a starting point for research, not a reason to expect a clinical effect.
Dosage & safety
Studied doseNo studied dose. Traditional herbal practice uses fresh plant tincture at 2–4 mL three times daily or an infusion of 2–4 g of dried herb; commercial capsules commonly supply around 400 mg.
SafetyLittle formal safety data. Traditionally regarded as gentle, but its reputed diuretic action means caution with diuretic drugs and in kidney disease, and contact dermatitis from the clinging hairs is reported. Not recommended in pregnancy or breastfeeding for lack of data. Persistent swollen lymph nodes need medical assessment.
Scientific references
Where to buy
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