Quick summary

Cleavers (Galium aparine) is a plant traditionally used for medicinal purposes. Current scientific research on its clinical efficacy and safety in humans is limited, with no evidence from human clinical trials available in the supplied data. Some studies suggest potential antibacterial, anti-inflammatory, and antioxidant properties based on its phytochemical content and traditional use; however, clinical validation is still pending.

What is it?

Cleavers, also known as Galium aparine, is a herbaceous plant found in many parts of the world. It has historically been used in traditional medicine systems, often for its purported cleansing and diuretic properties. The plant contains various bioactive compounds that contribute to its traditional applications.

Traditional uses

Traditionally, Cleavers has been used for urinary tract health and as a supportive herb for inflammation and detoxification. It has also been employed in folk medicine to promote skin health and lymphatic drainage. Despite its longstanding use, these applications mainly arise from historical use rather than robust clinical evidence.

Active compounds

Cleavers contains several phytochemicals, including flavonoids and polyphenols, which are believed to contribute to its biological activity. These compounds have been associated with potential antibacterial, anti-inflammatory, and antioxidant effects in preclinical research.

Potential benefits with evidence levels

  • Potential antibacterial and anti-inflammatory effects related to urinary tract infection (UTI) treatment
    Evidence level: Preclinical / Traditional use
    Supporting data: A review (Saddam et al. 2026) highlights Cleavers as one of several antibacterial herbs used traditionally for UTIs, attributing effects to bioactive flavonoids and polyphenols. However, challenges such as lack of standardization, unclear dosage, and absence of clinical validation remain.
  • Antioxidant activity
    Evidence level: In vitro / Preclinical
    Supporting data: While studies on Cleavers itself are limited, related compounds found in the plant have shown notable antioxidant activities in laboratory and nanoparticle forms (e.g., Nughwal et al. 2025). Direct clinical evidence of antioxidant efficacy for Cleavers is not currently available.

Side effects

No specific human clinical safety data or reports on adverse effects or toxicity related to Cleavers were found in the supplied studies. Its overall safety profile remains unclear due to the lack of clinical trials.

Drug interactions

No information on potential drug interactions involving Cleavers is available from the supplied data.

Who should avoid it

There are no documented contraindications for Cleavers based on the available research. However, due to the absence of safety data, caution is advised, especially during pregnancy and breastfeeding. Individuals with known allergies to plants in the Rubiaceae family should also exercise caution.

Evidence limitations

  • No randomized controlled trials or clinical studies in humans specifically investigating Cleavers were found in the supplied data.
  • Most evidence derives from preclinical reviews of phytochemicals, traditional uses, or generalized assessments of herbal antibacterial activity.
  • Lack of standardized formulations, dosing guidance, and safety assessments for Cleavers herbal preparations.
  • Absence of pharmacokinetic, toxicological, or long-term safety data in humans.
  • No direct evaluation of efficacy endpoints in clinical populations.

References

Last reviewed

April 2024

Informational disclaimer: This page is for informational purposes only and does not constitute medical advice. Cleavers should not be used as a substitute for professional healthcare. Consult a healthcare provider before starting any herbal supplement, especially if you are pregnant, breastfeeding, have existing medical conditions, or are taking other medications.