2023 Rhinosinusitis Study: Can Oil Of Oregano Help Your Sinuses?
Oil of Oregano Rhinosinusitis Study 2023: What Actually Changed
The main 2023 change was not a new oregano-oil trial, but a higher-level synthesis that placed Origanum vulgare among the more promising herbal options for chronic rhinosinusitis without nasal polyps, while still rating the evidence as low certainty and calling for larger, longer trials. The most relevant clinical study behind that signal remains a 2020 randomized, double-blind trial in 75 adults, where oregano oil nasal spray produced a larger drop in SNOT-22 symptom scores than fluticasone or sesame-oil placebo over 4 weeks.
What the 2023 review found
The 2023 review pooled 47 randomized controlled trials across 18 herbal medicines and six rhinosinusitis populations, then applied GRADE to judge certainty. For chronic rhinosinusitis without nasal polyps, oregano oil was reported as the most beneficial herbal treatment for symptom and quality-of-life improvement, but the authors explicitly labeled that evidence as low certainty.
That distinction matters because "most beneficial" in a network meta-analysis does not mean "proven superior in routine care." It means that, among the herbal interventions studied, oregano ranked favorably in the available datasets, but the underlying evidence base was still small and not definitive.
The key clinical trial
The landmark study linked to this topic was conducted at an otolaryngology clinic in Iran and enrolled 75 adults with chronic rhinosinusitis from January 30 to June 25, 2018; it was published in 2020. Participants received a 4-week regimen that paired lifestyle guidance with either oregano-oil nasal spray, fluticasone, or sesame-oil placebo.
At the end of treatment, the mean reduction in SNOT-22 scores was 51.52 points in the oregano group, 21.60 points in the fluticasone group, and 11.84 points in the placebo group. The reported mean difference favored oregano over fluticasone by 29.92 points and over placebo by 39.68 points, which is a large symptom signal by patient-reported standards.
| Study element | Reported finding | Interpretation |
|---|---|---|
| Population | 75 adults with chronic rhinosinusitis | Small, single-center trial |
| Intervention | Oregano-oil nasal spray for 4 weeks | Topical, not oral supplementation |
| Comparator | Fluticasone and sesame-oil placebo | Active and placebo controls included |
| SNOT-22 change | 51.52 points | Large symptom improvement |
| Authors' conclusion | Clinically meaningful benefit, but generalization needs more study | Promising, not practice-changing on its own |
Why 2023 mattered
In 2023, the field moved from a single positive study to a broader evidence map. The review showed that multiple herbal medicines may help different forms of rhinosinusitis, and that oregano stood out specifically for chronic rhinosinusitis without nasal polyps, but the certainty remained limited because of small samples, heterogeneous protocols, and few direct comparisons.
This is the real "what changed" message: oregano oil shifted from being an isolated traditional-medicine claim to being a candidate with some comparative human data. Even so, the evidence was still not strong enough to replace established treatments such as guideline-based intranasal corticosteroids, saline irrigation, or specialist evaluation when symptoms persist.
How strong is the evidence?
At a practical level, the evidence looks encouraging but early. The 2023 synthesis found only low-certainty support for oregano in CRSsNP, and the broader oregano-oil evidence base for upper respiratory uses remains sparse in humans compared with the extensive preclinical antimicrobial literature.
A useful way to read the data is this: oregano oil may be a hypothesis-generating adjunct, not a settled standard of care. The positive trial used a nasal spray formulation under study conditions, so the results should not be casually generalized to oral capsules, undiluted essential oil, or over-the-counter products with different concentrations.
"This study shows that oregano oil results in clinically meaningful benefits beyond those of fluticasone and sesame oil for patients with CRS without nasal polyps," the trial authors reported, while also noting that broader generalization still needed exploration.
Safety and limitations
Oil of oregano is not automatically safe just because it is plant-derived. Commonly reported concerns with oregano-oil products include gastrointestinal irritation, mouth and throat burning when undiluted, allergic reactions in people sensitive to the Lamiaceae family, and skin irritation with topical use.
The biggest limitation in interpreting the 2023 literature is that "herbal medicine" studies often vary in dose, formulation, endpoint selection, and follow-up length. In other words, a positive result from one nasal-spray protocol does not establish that every oregano product, dose, or route of use will work the same way.
What to do with the findings
For readers trying to act on the study, the safest interpretation is conservative. Oregano oil nasal spray is an interesting research finding for chronic rhinosinusitis without nasal polyps, but it should not be treated as a proven replacement for standard care.
- Use the 2023 result as a signal that oregano deserves more study, not as a standalone treatment recommendation.
- Recognize that the best-known trial was small, short, and disease-subtype specific.
- Do not extrapolate nasal-spray results to oral essential-oil products.
- Seek medical care if sinus symptoms are persistent, severe, or associated with fever, swelling, vision changes, or shortness of breath.
Bottom line
The 2023 evidence did not "prove" oregano oil for rhinosinusitis, but it did elevate the herb from folk remedy to a plausible candidate with low-certainty supportive data in chronic rhinosinusitis without nasal polyps. The headline change was ranking, not definitive confirmation: oregano looked promising in a broader 2023 review, yet the case still rests on limited clinical evidence and one especially influential small trial.
FAQ
Helpful tips and tricks for 2023 Rhinosinusitis Study Can Oil Of Oregano Help Your Sinuses
Did the 2023 study prove oregano oil works for sinusitis?
No. The 2023 review suggested oregano was promising for chronic rhinosinusitis without nasal polyps, but it rated the evidence as low certainty and called for more research.
Was there a new oregano-oil trial in 2023?
The most important human trial was published in 2020, not 2023, and the 2023 paper was a broader systematic review and network meta-analysis that included it.
How was oregano oil used in the study?
It was delivered as a nasal spray in a 4-week protocol, alongside saline and lifestyle guidance, rather than as a drink or capsule.
How large was the symptom improvement?
The oregano group's mean SNOT-22 improvement was 51.52 points, compared with 21.60 for fluticasone and 11.84 for placebo.
Is oregano oil safe to use in the nose?
Safety depends on the formulation and dilution, and essential oils can irritate tissue or trigger allergic reactions; the available research does not justify assuming all products are safe for self-treatment.