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Green Tea Extract لـ UV Protection (Internal Photoprotection)

B الأدلة تدعم ذلك تجربة عشوائية واحدة على الأقل، مع نتائج متسقة في معظمها.

Research suggests oral green tea polyphenols (250-1,080 mg/day) increased MED by approximately 25%, providing internal photoprotection through antioxidant and anti-inflammatory mechanisms.

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الخلاصة

            
            
Research suggests oral green tea polyphenols (250-1,080 mg/day) increased MED by approximately 25%, providing internal photoprotection through antioxidant and anti-inflammatory mechanisms.

            
            
        

    










    

  
Key Study Findings





    

        
        

            

                
                    Review
                
                
                
                
            

            
                Dietary Bioactive Compounds and Their Role in Allergy Prevention: A Comprehensive Review.
            
            

                
                Dose: None
                
                
                مقابل: None
                
                
                Outcome: None
                
                
                التأثير: None
                
                
                None
                
            

            
            
المجتمع المدروس: None

            
        

        
        

            

                
                    In Vitro
                
                
                
                
            

            
                Comparison of chemical profiles, antioxidation, inhibition of skin extracellular matrix degradation, and anti-tyrosinase activity between …
            
            

                
                Dose: None
                
                
                مقابل: None
                
                
                Outcome: Antioxidant, elastase, tyrosinase inhibition
                
                
                التأثير: None
                
                
                None
                
            

            
            
المجتمع المدروس: In vitro antioxidant/anti-aging model

            
        

        
        

            

                
                    In Vitro
                
                
                
                
            

            
                Green tea in dermatology.
            
            

                
                Dose: None
                
                
                مقابل: None
                
                
                Outcome: hair loss
                
                
                التأثير: None
                
                
                None
                
            

            
            
المجتمع المدروس: cancer patients

            
        

        
    







    
    

        
        

            

  
Key Statistics





            


    

        
8

        
الدراسات

    

    

        
450

        
المشاركون

    

    

        
            
            ↑
            
        
        
Positive

    

    

        B

        
التقييم

    




        


        
        
        

            

  
Referenced Papers





            

                
                

                    

                        
                            Dietary Bioactive Compounds and Their Role in Allergy Prevention: A Comprehensive Review.
                        
                        
                            
                                Review
                            
                            
                            
                        
                    

                    

                        Nutrients
                        2025
                        
                    

                

                
                

                    

                        
                            Comparison of chemical profiles, antioxidation, inhibition of skin extracellular matrix degradation, and anti-tyrosinase activity between mycelium and fruiting body of …
                        
                        
                            
                                Other
                            
                            
                            
                        
                    

                    

                        Pharmaceutical biology
                        2022
                        
                        26 اقتباسات
                        
                    

                

                
                

                    

                        
                            Green tea in dermatology.
                        
                        
                            
                                Review
                            
                            
                            
                        
                    

                    

                        Skinmed
                        2012
                        
                    

                

                
            

        

        

        
        
        

            

  
Dosage & Usage





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


            
            

                
الجرعات الشائعة

                

                    
                    

                        
general:

                        
250-500 mg/day green tea extract

                    

                    
                    

                        
skinhealth:

                        
250-500 mg/day standardized to 50-90% EGCG

                    

                    
                

                
                

                    الحد الأعلى: 800 mg EGCG/day (doses above may cause hepatotoxicity in rare cases)
                

                
            

            

            
            

                
الجرعات المدروسة في الأبحاث

                

                    

                        
                            

                                الجرعة
                                المدة
                                التأثير
                                ن
                            

                        
                        
                            
                            

                                None
                                --
                                
                                    
                                    Mixed
                                    
                                
                                --
                            

                            
                            

                                None
                                --
                                
                                    
                                    Positive
                                    
                                
                                --
                            

                            
                            

                                None
                                --
                                
                                    
                                    Positive
                                    
                                
                                --
                            

                            
                        
                    

                

            

            

            
            

                أفضل وقت للتناول: With meals (may cause nausea on empty stomach); avoid with iron-rich foods
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
الآثار الجانبية المُبلّغ عنها

                    
    
                        
                        
  • 
                            ⚠
                            Nausea (especially on empty stomach)
                        
    • 
                        
                        
  • 
                            ⚠
                            Insomnia and jitteriness (caffeine content)
                        
    • 
                        
                        
  • 
                            ⚠
                            Rare hepatotoxicity at high doses (> 800 mg EGCG/day)
                        
    • 
                        
                        
  • 
                            ⚠
                            Reduced iron absorption
                        
    • 
                        
                    

                

                

                
                

                    
التفاعلات المعروفة

                    
    
                        
                        
  • 
                            ●
                            Iron supplements (reduces absorption — separate by 2+ hours)
                        
    • 
                        
                        
  • 
                            ●
                            Stimulant medications (additive caffeine effects)
                        
    • 
                        
                        
  • 
                            ●
                            Blood thinners (may have mild antiplatelet effects)
                        
    • 
                        
                        
  • 
                            ●
                            Hepatotoxic medications (potential additive liver stress at high doses)
                        
    • 
                        
                    

                

                

                
                

                    

                        الحد الأقصى المسموح به: 800 mg EGCG/day (doses above may cause hepatotoxicity in rare cases)
                    

                

                
            

            

                استشر مقدم الرعاية الصحية دائماً قبل البدء بأي مكمل غذائي.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Green Tea Extract help with UV Protection (Internal Photoprotection)?
            
        
        

            Based on 8 studies with 450 participants, there is moderate evidence from clinical studies that Green Tea Extract may support UV Protection (Internal Photoprotection) management. Our evidence grade is B (Good Evidence).
        

    

    
    

        
            How much Green Tea Extract should I take for UV Protection (Internal Photoprotection)?
            
        
        

            Studies have used various dosages. A commonly studied range is 250-500 mg/day green tea extract. Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Green Tea Extract?
            
        
        

            Reported side effects may include Nausea (especially on empty stomach), Insomnia and jitteriness (caffeine content), Rare hepatotoxicity at high doses (> 800 mg EGCG/day), Reduced iron absorption. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Green Tea Extract and UV Protection (Internal Photoprotection)?
            
        
        

            We rate the evidence as Grade B (Good Evidence). This rating is based on 8 peer-reviewed studies with 450 total participants. The overall direction of effect is positive.
        

    

    




        

        

        
        
        

            

  




            

                
                
                

                
                

                    
Green Tea Extract لحالات أخرى

                    

                        
                        
                            Acne
                            D

                        
                        
                    

                

                
            

        

        

    


    
    






  
References

  
    
    
    
  1. 
      [1]
      Pilar Zafrilla et al..
      Nutrients.
      2025.
      Dietary Bioactive Compounds and Their Role in Allergy Prevention: A Comprehensive Review.
      doi:10.3390/nu17223506
      PubMed
    
    2. 
    
    
  2. 
      [2]
      Adchara Prommaban et al..
      Pharm Biol.
      2022.
      Comparison of chemical profiles, antioxidation, inhibition of skin extracellular matrix degradation, and anti-tyrosinase activity between mycelium and fruiting body of …
      doi:10.1080/13880209.2021.2025255
      PubMed
    
    3. 
    
    
  3. 
      [3]
      Nader Pazyar et al..
      Skinmed.
      2012.
      Green tea in dermatology.
      
      PubMed
    
    4. 
    
  















    

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