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Oro4.0
Oregano Oil Research
Mostly mechanism / observational
38 peer-reviewed studies
What the evidence says
Mostly mechanism / observational
Most Oregano Oil studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2006–2026.
Based on 38 studies · 2 meta-analyses · 4 RCTs
Confidence
High confidence
By outcome
Respiratory & lung
Too few graded studies5 studies
Neuroprotection & brain aging
Mostly mechanism / observational4 studies
Glucose & metabolic
Mostly mechanism / observational3 studies
Therapeutic & clinical
Too few graded studies2 studies
Safety profile
Too few graded studies2 studies
Oral & dental health
Too few graded studies2 studies
Cognitive function
Too few graded studies1 study
Anemia & hematology
Too few graded studies1 study
3 more outcomes with fewer studies not shown.
Active research area
35 studies in the last 5 years · Latest meta-analysis: 2024
200620162026
1RCT2006
Nurmi A, Mursu J, Nurmi T, Nyyssönen K, Alfthan G, Hiltunen R · J Agric Food Chem (2006)
No plain-language summary recorded for this citation — open the paper to read its abstract.
In plain English: Therefore Z. multiflora and its constituents may be considered as a preventive and/or relieving therapy in various respiratory diseases.
Ghorani V et al. · Phytotherapy research : PTR (2022)
The preventive effects of Z. multiflora were also demonstrated by mechanisms such as antioxidant, immunomodulatory, and antiinflammatory properties in the experimental animal models of different respiratory diseases.
Carvacrol and thymol are probably responsible for the therapeutic effect of plant among 56 constituents of Z. multiflora.
In addition, bronchodilatory and preventive effects of the plant and its constituents on asthma, COPD, lung disorders due to noxious agents and allergic and immunologic disorders were shown in the clinical studies.
In plain English: Essential oils that target PPAR/PI3K-Akt/MAPK signalling pathways could supplement other approaches to modulate microglial-associated inflammation to treat neurodegenerative diseases, particularly in cases where reactive microglia play a part in the pathophysiological mechanisms underlying neurodegeneration.
Stojanović NM et al. · International journal of molecular sciences (2024)
This study, starting from the ethnopharmacological premises of the therapeutic benefits of aromatic plants, assessed the evidence for the essential oil modulation of microglia, investigating their potential pharmacological mechanisms.
Current knowledge of the phytoconstituents, safety of essential oil components, and anti-inflammatory and potential neuroprotective effects were reviewed.
In plain English: Therefore, native plants of Iran have been reported to have antimicrobial properties for the treatment of vaginal infections and can be used as a suitable and effective alternative to antibiotics in future research.
Rashidipour M et al. · Infectious disorders drug targets (2022)
Therefore, native plants of Iran have been reported to have antimicrobial properties for the treatment of vaginal infections and can be used as a suitable and effective alternative to antibiotics in future research.
In plain English: In addition, elaborate structure-activity studies are needed to explore the potential use of Origanum-derived phytochemicals as promising drug candidates.
Sharifi-Rad M et al. · Phytotherapy research : PTR (2021)
However, Origanum has been reported causing angioedema, perioral dermatitis, allergic reaction, inhibition of platelet aggregation, hypoglycemia, and abortion.
Conclusive evidences are still required for its clinical applications against human medical conditions.
Toxicity analyses and risk assessment will aid to its safe and efficacious application.
In plain English: The potential of these compounds is discussed as the new nutraceutical drugs that may help to decrease the burden of cardiovascular disorders.
Abdul Ghani MA et al. · International journal of molecular sciences (2023)
Terpenophenolic compounds are comprised of terpenes and natural phenols as secondary metabolites by plants and are commonly found in the genus Humulus and Cannabis.
A growing body of evidence has shown that terpenophenolic compounds exhibit protective properties against inflammation and apoptosis within the cardiovascular system.
This review highlights the current evidence elucidating the molecular actions of terpenophenolic compounds in protecting the cardiovascular system, i.e., bakuchiol, ferruginol, carnosic acid, carnosol, carvacrol, thymol and hinokitiol.
In plain English: The review brings an up to date regarding the phytochemistry and bioactivity of Origanum vulgare L. essential oil, underlining also the most successful pharmaceutical formulation used for skin disorders.
Lombrea A et al. · International journal of molecular sciences (2020)
The bioactivities are in tight relation to the phytochemical profile of the essential oil, and also depend on taxonomic, climatic, and geographical characteristics of the plant material.
The antibacterial, antifungal, antiparasitic, antioxidant, anti-inflammatory, antitumor, skin disorders beneficial effects, next to antihyperglycemic and anti-Alzheimer activities were reported and confirmed in multiple studies.
Moreover, recent studies indicate a positive impact on skin disorders of OEO formulated as nanocarrier systems in order to improve its bioavailability and, thus, enhancing its therapeutic benefits.
In plain English: There is still a lot to discover and research.
de Carvalho FO et al. · Naunyn-Schmiedeberg's archives of pharmacology (2021)
Anyway, the benefits of carvacrol are numerous and the therapeutic possibilities too.
With this description, the question arises: would carvacrol be a supporting treatment option, effective in minimizing the deleterious effects of Covid-19?
In plain English: Knowledge of the multiple activities of carvacrol and magnolol can assist with the development of new treatment strategies, and the design of clinical animal and human trials will maximize the potential benefits of these extracts in subjects suffering from periodontitis or diabetes.
Cicalău GIP et al. · Molecules (Basel, Switzerland) (2021)
Based on our search strategy we conducted a literature search in the PubMed and Google Scholar databases to identify studies.
A total of one hundred eighty-four papers were included in the current review.
The results show that carvacrol and magnolol have anti-inflammatory, antioxidant, antimicrobial, anti-osteoclastic, and anti-diabetic properties that benefit both pathologies.
In plain English: The integration of carvacrol into existing treatment regimens could offer a multifaceted approach to asthma management, enhancing therapeutic outcomes and improving patients' quality of life.
Neopane D et al. · Pharmacological reports : PR (2025)
We discuss its mechanisms of action, including modulation of inflammatory pathways, inhibition of oxidative stress, and relaxation of bronchial muscles.
Additionally, preclinical and clinical studies evaluating the efficacy and safety of carvacrol in asthma treatment are analyzed.
The integration of carvacrol into existing treatment regimens could offer a multifaceted approach to asthma management, enhancing therapeutic outcomes and improving patients' quality of life.
In plain English: This is the first nationwide ethnomedical screening work conducted on flu treatment with plants in Turkey.
Sargin SA · Journal of ethnopharmacology (2021)
Rosa canina (58.7%) and Mentha x piperita (22.2%) were identified as the most common plants used in Turkey.
Also, Sambucus nigra (11.6%), Olea europaea (9.3%), Eucalyptus spp., Melissa officinalis, and Origanum vulgare (7.0%) emerged as the most investigated taxa.
This is the first nationwide ethnomedical screening work conducted on flu treatment with plants in Turkey.
In plain English: Due to anti-inflammatory and antioxidant effect, carvacrol could be suggested as a therapeutic agent for asthma.
Ghorani V et al. · Phytomedicine : international journal of phytotherapy and phytopharmacology (2021)
In carvacrol-treated group, respiratory symptoms significantly decreased after one- and two-month treatment with carvacrol compared to pre-treatment values (p < 0.05 to p < 0.001).
Compared to step 0, PFT values were significantly increased in step I and II, in treated group with carvacrol (p < 0.05 to p < 0.001).
Most oxidative stress markers were improved following carvacrol treatment (p < 0.05 to p < 0.001).
In plain English: Our review provides useful evidence about the neuroprotective potential of CV; however, a lack of studies was observed regarding CV encapsulation in proper dosage forms, in particular nanoparticles, which could be further explored for CV delivery to the central nervous system.
Tareen FK et al. · Molecules (Basel, Switzerland) (2024)
Neurodegenerative diseases were mostly perceived as diseases of ageing populations, but now-a-days, these diseases pose a threat to populations of all age groups despite significant improvements in quality of life.
All the research articles from these libraries were sorted out, with the first article tracing back to 2009, and the latest article was published in 2024.
The positive effects of CV in the treatment of Alzheimer's and Parkinson's Diseases, multiple sclerosis, ischemia, and behavioural disorders have been supported with evidence.
For a long time, oxidative stress has been recognized as a primary contributor to neurodegeneration.
Carvacrol enhances memory and cognition by modulating the effects of oxidative stress, inflammation, and Aβ25-35- induced neurotoxicity in AD.
Moreover, it also reduces the production of reactive oxygen species and proinflammatory cytokine levels in PD, which further prevents the loss of dopaminergic neurons in the substantia nigra and improves motor functions.
In plain English: The oregano fractions can be used in the food, health, and agricultural industries.
Bautista-Hernández I et al. · Molecules (Basel, Switzerland) (2021)
Furthermore, thermoresistant compounds that remain in the plant matrix following a thermal process can be priced in terms of the circular economy.
By using better and more selective extraction conditions, the bioactive compounds present in Mexican oregano can be studied as potential inhibitors of COVID-19.
Also, research on extraction technologies should continue to ensure a higher quality of bioactive compounds while preventing an undesired chemical shift (e.g., hydrolysis).
In plain English: The results of this phase I study regarding carvacrol effects on healthy subjects, showed clinical safety and tolerability for this agent.
Ghorani V et al. · Drug and chemical toxicology (2021)
There was significant reductions in high-density lipoprotein cholesterol (HDL), total bilirubin, amylase, iron, red blood cells (RBC) count, and HCT after one-month treatment with 2 mg/kg/day carvacrol compared to pretreatment values (p < 0.05-p < 0.01).
Treatment with carvacrol 2 mg/kg/day for one month increased FEV1 (p < 0.05).
Nevertheless, there was no significant difference in measured variables except LDH, MCH, MCHC, and MCV (p < 0.05-p < 0.01), between the two groups.
In plain English: Z. multiflora extract significantly alleviated UC symptoms and reduced inflammatory markers, indicating its potential as a complementary treatment for UC.
Morvaridi M et al. · Journal of ethnopharmacology (2025)
No significant changes were observed in Erythrocyte Sedimentation Rate (ESR) (p = 0.25), GATA Binding Protein 3 (GATA3) (p = 0.09), and Forkhead Box P3 (FOXP3) (p = 0.17).
Symptoms such as heartburn, acid reflux, bloating, diarrhea, and fecal urgency improved (p < 0.05).
The GSRS score improved (p < 0.001), while the p-Mayo score did not show a significant change (p = 0.24).