Evidence supporting the use of: Bidens pilosa
For the health condition: Conjunctivitis

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Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Bidens pilosa, commonly known as Spanish needle or blackjack, has a long history of traditional use in various cultures for the treatment of eye conditions, including conjunctivitis. Ethnobotanical surveys from countries in Africa, South America, and Asia report its application as a topical eyewash or in the form of poultices for soothing eye irritation and inflammation. These practices are primarily based on the plant’s reputed anti-inflammatory and antimicrobial properties, as observed in folk medicine.

Scientific studies have confirmed that Bidens pilosa contains bioactive compounds—such as flavonoids, polyacetylenes, and phenolic acids—that exhibit antimicrobial and anti-inflammatory effects in vitro and in animal models. However, specific research directly evaluating the efficacy and safety of Bidens pilosa preparations in treating conjunctivitis in humans is either very limited or absent. The traditional use is thus supported by some pharmacological rationale, but high-quality clinical trials are lacking.

In summary, the use of Bidens pilosa for conjunctivitis is grounded in traditional medicine, with preliminary scientific evidence supporting its potential anti-inflammatory and antimicrobial actions, but without robust clinical validation for this specific indication.

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