Evidence supporting the use of: Oregano
For the health condition: Parasites (general)

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Synopsis

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

Oregano, particularly in the form of oregano oil, has been traditionally used as a remedy for intestinal parasites, and modern research provides some scientific basis for its antiparasitic activity. The active compounds in oregano, such as carvacrol and thymol, have demonstrated antimicrobial and antiparasitic properties in laboratory studies. Several in vitro (test tube) and animal studies have shown that oregano oil can inhibit the growth of certain parasites, including Giardia lamblia and Entamoeba histolytica. A small clinical trial published in 2000 in Phytotherapy Research found that supplementation with oregano oil helped reduce symptoms and parasite load in adults with intestinal parasites. However, the size of the study was limited, and more extensive clinical trials are needed to confirm efficacy and safety in humans.

Despite promising laboratory data, the overall quality of evidence is low, primarily consisting of in vitro studies, animal research, and limited human trials. While oregano has a long history of use in traditional medicine for digestive issues, its specific antiparasitic effects are only partly supported by scientific research to date. As such, oregano oil may be considered as a supportive therapy, but it should not replace standard antiparasitic medications without medical supervision. More rigorous clinical studies are necessary to determine optimal dosages, efficacy, and safety profiles for treating parasitic infections.

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