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5 peer-reviewed studies
What the evidence says
Most Oregano Oil studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality meta-analyses and randomised trials published 2020–2025.
Based on 5 studies · 2 meta-analyses
Confidence
HighBy outcome
4 studies in the last 5 years · Latest meta-analysis: 2024
A meta-analysis of Mediterranean-diet aromatic herbs and spices included oregano among those with metabolic/antioxidant signals.
Garza MC et al. · Nutrients (2024)
A meta-analysis reported anti-inflammatory and antioxidant activity of carvacrol (oregano's main compound), largely in preclinical/respiratory models.
de Carvalho FO et al. · Phytotherapy research : PTR (2020)
A systematic review documented antifungal activity of Origanum essential oil (mostly in vitro).
Mezzomo L et al. · Chemistry & biodiversity (2025)
A systematic review of anti-diabetic plant essential-oil compounds included oregano/carvacrol.
Gandhi GR et al. · Critical reviews in food science and nutrition (2024)
A review summarized antimicrobial activity of carvacrol and derivatives against mycobacteria (in vitro).
Fermiano TH et al. · Future medicinal chemistry (2024)