Skip to main content
ImmuneCited

Olive Leaf Extract for Upper Respiratory Tract Infections

D

Preclinical studies demonstrate oleuropein's antiviral and antimicrobial properties. Small clinical trials suggest antioxidant and anti-inflammatory benefits. The evidence base for immune-specific outcomes is growing but remains in early stages.

<\/script>\n
`; }, get iframeSnippet() { const domain = 'immunecited.com'; const params = 'ingredient\u003Dolive\u002Dleaf\u0026condition\u003Dupper\u002Drespiratory\u002Dinfections'; return ``; }, get activeSnippet() { return this.method === 'script' ? this.scriptSnippet : this.iframeSnippet; }, copySnippet() { navigator.clipboard.writeText(this.activeSnippet).then(() => { this.copied = true; setTimeout(() => { this.copied = false; }, 2000); }); } }" @keydown.escape.window="open = false" @click.outside="open = false">

Embed This Widget

Style



      
      
    


    
    

      Widget powered by
      .
      Free, no account required.
    

  




    








    

        

            D

        

        

            
The Bottom Line

            
            
Preclinical studies demonstrate oleuropein's antiviral and antimicrobial properties. Small clinical trials suggest antioxidant and anti-inflammatory benefits. The evidence base for immune-specific outcomes is growing but remains in early stages.

            
            
        

    










    

  
Key Study Findings





    

        
        

            

                
                    Review
                
                
                
                
            

            
                Colds and influenza: a review of diagnosis and conventional, botanical, and nutritional considerations.
            
            

                
                Dose: None
                
                
                vs: None
                
                
                Outcome: Colds and influenza: a review of diagnosis and …
                
                
                Effect: None
                
                
                None
                
            

            
            
Population: None

            
        

        
    







    
    

        
        

            

  
Key Statistics





            


    

        
3

        
Studies

    

    

        
100

        
Participants

    

    

        
            
            ↑
            
        
        
Positive

    

    

        D

        
Grade

    




        


        
        
        

            

  
Referenced Papers





            

                
                

                    

                        
                            Colds and influenza: a review of diagnosis and conventional, botanical, and nutritional considerations.
                        
                        
                            
                                Review
                            
                            
                            
                        
                    

                    

                        Alternative medicine review …
                        2007
                        
                        163 citations
                        
                    

                

                
            

        

        

        
        
        

            

  
Dosage & Usage





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


            
            

                
Commonly Used Dosages

                

                    
                    

                        
general:

                        
500-1,000 mg standardized extract/day (15-20% oleuropein)

                    

                    
                

                
                

                    Upper limit: No established UL
                

                
            

            

            
            

                
Dosages Studied in Research

                

                    

                        
                            

                                Dosage
                                Duration
                                Effect
                                N
                            

                        
                        
                            
                            

                                None
                                --
                                
                                    
                                    Mixed
                                    
                                
                                --
                            

                            
                        
                    

                

            

            

            
            

                Best taken: With meals
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
Reported Side Effects

                    
    
                        
                        
  • 
                            ⚠
                            Mild gastrointestinal discomfort
                        
    • 
                        
                        
  • 
                            ⚠
                            Headache (possible Herxheimer reaction)
                        
    • 
                        
                        
  • 
                            ⚠
                            Dizziness
                        
    • 
                        
                    

                

                

                
                

                    
Known Interactions

                    
    
                        
                        
  • 
                            ●
                            Antihypertensive medications (additive blood pressure lowering)
                        
    • 
                        
                        
  • 
                            ●
                            Diabetes medications (may lower blood sugar)
                        
    • 
                        
                        
  • 
                            ●
                            Anticoagulants (theoretical increased bleeding risk)
                        
    • 
                        
                    

                

                

                
                

                    

                        Tolerable upper intake: No established UL
                    

                

                
            

            

                Always consult your healthcare provider before starting any supplement.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Olive Leaf Extract help with Upper Respiratory Tract Infections?
            
        
        

            Based on 3 studies with 100 participants, there is preliminary evidence that needs more research that Olive Leaf Extract may support Upper Respiratory Tract Infections management. Our evidence grade is D (Very Early Research).
        

    

    
    

        
            How much Olive Leaf Extract should I take for Upper Respiratory Tract Infections?
            
        
        

            Studies have used various dosages. A commonly studied range is 500-1,000 mg standardized extract/day (15-20% oleuropein). Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Olive Leaf Extract?
            
        
        

            Reported side effects may include Mild gastrointestinal discomfort, Headache (possible Herxheimer reaction), Dizziness. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Olive Leaf Extract and Upper Respiratory Tract Infections?
            
        
        

            We rate the evidence as Grade D (Very Early Research). This rating is based on 3 peer-reviewed studies with 100 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.