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ImmuneCited

Oregano Oil for Upper Respiratory Tract Infections

D

Strong in vitro antimicrobial evidence against bacteria and fungi via carvacrol and thymol. Used extensively in Mediterranean traditional medicine. Human clinical data for immune-specific outcomes is limited, with most evidence being preclinical.

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            D

        

        

            
The Bottom Line

            
            
Strong in vitro antimicrobial evidence against bacteria and fungi via carvacrol and thymol. Used extensively in Mediterranean traditional medicine. Human clinical data for immune-specific outcomes is limited, with most evidence being preclinical.

            
            
        

    










    

  
Key Study Findings





    

        
        

            

                
                    Systematic Review
                
                
                
                
            

            
                Herbal Medicines for Rhinosinusitis: A Systematic Review and Network Meta-analysis.
            
            

                
                Dose: None
                
                
                vs: None
                
                
                Outcome: None
                
                
                Effect: None
                
                
                None
                
            

            
            
Population: None

            
        

        
    







    
    

        
        

            

  
Key Statistics





            


    

        
2

        
Studies

    

    

        
50

        
Participants

    

    

        
            
            ↑
            
        
        
Positive

    

    

        D

        
Grade

    




        


        
        
        

            

  
Referenced Papers





            

                
                

                    

                        
                            Herbal Medicines for Rhinosinusitis: A Systematic Review and Network Meta-analysis.
                        
                        
                            
                                Meta-Analysis
                            
                            
                            
                        
                    

                    

                        Current allergy and …
                        2023
                        
                        6 citations
                        
                    

                

                
            

        

        

        
        
        

            

  
Dosage & Usage





            
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units


            
            

                
Commonly Used Dosages

                

                    
                    

                        
oil:

                        
2-4 drops diluted, 2-3x/day

                    

                    
                    

                        
general:

                        
150-300 mg standardized extract/day (60-80% carvacrol)

                    

                    
                

                
                

                    Upper limit: No established UL; short-term use recommended
                

                
            

            

            
            

                
Dosages Studied in Research

                

                    

                        
                            

                                Dosage
                                Duration
                                Effect
                                N
                            

                        
                        
                            
                            

                                None
                                --
                                
                                    
                                    Positive
                                    
                                
                                --
                            

                            
                        
                    

                

            

            

            
            

                Best taken: With meals; emulsified forms preferred for absorption
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
Reported Side Effects

                    
    
                        
                        
  • 
                            ⚠
                            Gastrointestinal irritation
                        
    • 
                        
                        
  • 
                            ⚠
                            Mouth and throat burning (undiluted oil)
                        
    • 
                        
                        
  • 
                            ⚠
                            Allergic reactions (especially in those allergic to Lamiaceae family)
                        
    • 
                        
                        
  • 
                            ⚠
                            Skin irritation with topical use
                        
    • 
                        
                    

                

                

                
                

                    
Known Interactions

                    
    
                        
                        
  • 
                            ●
                            Anticoagulant medications (may increase bleeding risk)
                        
    • 
                        
                        
  • 
                            ●
                            Diabetes medications (may lower blood sugar)
                        
    • 
                        
                        
  • 
                            ●
                            Iron supplements (may reduce iron absorption)
                        
    • 
                        
                    

                

                

                
                

                    

                        Tolerable upper intake: No established UL; short-term use recommended
                    

                

                
            

            

                Always consult your healthcare provider before starting any supplement.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Oregano Oil help with Upper Respiratory Tract Infections?
            
        
        

            Based on 2 studies with 50 participants, there is preliminary evidence that needs more research that Oregano Oil may support Upper Respiratory Tract Infections management. Our evidence grade is D (Very Early Research).
        

    

    
    

        
            How much Oregano Oil should I take for Upper Respiratory Tract Infections?
            
        
        

            Studies have used various dosages. A commonly studied range is 2-4 drops diluted, 2-3x/day. Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Oregano Oil?
            
        
        

            Reported side effects may include Gastrointestinal irritation, Mouth and throat burning (undiluted oil), Allergic reactions (especially in those allergic to Lamiaceae family), Skin irritation with topical use. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Oregano Oil and Upper Respiratory Tract Infections?
            
        
        

            We rate the evidence as Grade D (Very Early Research). This rating is based on 2 peer-reviewed studies with 50 total participants. The overall direction of effect is positive.
        

    

    




        

        

        
        
        

            

  
Related Evidence





            

                
                

                    
Other ingredients for Upper Respiratory Tract Infections

                    

                        
                        
                            Vitamin D
                            A

                        
                        
                        
                            Zinc
                            A

                        
                        
                        
                            Beta-Glucan
                            A

                        
                        
                        
                            Vitamin C
                            B

                        
                        
                        
                            Echinacea
                            B

                        
                        
                        
                            Andrographis
                            B

                        
                        
                    

                

                

                
            

        

        

    


    
    












    

        FDA Disclaimer:
        These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.