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Selenium for UV Protection (Internal Photoprotection)

C Some Evidence Limited evidence from small studies, but some positive signals exist.

The SU.VI.MAX trial suggests selenium-containing antioxidant supplements may reduce skin cancer risk in men. Selenium supports glutathione peroxidase-mediated protection against UV-induced oxidative damage.

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The Bottom Line

            
            
The SU.VI.MAX trial suggests selenium-containing antioxidant supplements may reduce skin cancer risk in men. Selenium supports glutathione peroxidase-mediated protection against UV-induced oxidative damage.

            
            
        

    










    

  
Key Study Findings





    

        
        

            

                
                    Systematic Review
                
                
                
                
            

            
                Oral Supplements and Photoprotection: A Systematic Review.
            
            

                
                Dose: None
                
                
                vs: Placebo/no supplement
                
                
                Outcome: Photoprotective effects (MED, erythema)
                
                
                Effect: None
                
                
                None
                
            

            
            
Population: Healthy adults (47 studies in systematic review)

            
        

        
    







    
    

        
        

            

  
Key Statistics





            


    

        
5

        
Studies

    

    

        
1800

        
Participants

    

    

        
            
            ↑
            
        
        
Positive

    

    

        C

        
Grade

    




        


        
        
        

            

  
Referenced Papers





            

                
                

                    

                        
                            Oral Supplements and Photoprotection: A Systematic Review.
                        
                        
                            
                                Systematic Review
                            
                            
                            
                        
                    

                    

                        Journal of medicinal …
                        2025
                        
                        3 citations
                        
                    

                

                
            

        

        

        
        
        

            

  
Dosage & Usage





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


            
            

                
Commonly Used Dosages

                

                    
                    

                        
general:

                        
55 mcg/day (RDA)

                    

                    
                    

                        
skinhealth:

                        
55-200 mcg/day

                    

                    
                

                
                

                    Upper limit: 400 mcg/day (toxicity: selenosis)
                

                
            

            

            
            

                
Dosages Studied in Research

                

                    

                        
                            

                                Dosage
                                Duration
                                Effect
                                N
                            

                        
                        
                            
                            

                                None
                                --
                                
                                    
                                    Positive
                                    
                                
                                --
                            

                            
                        
                    

                

            

            

            
            

                Best taken: With meals
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
Reported Side Effects

                    
    
                        
                        
  • 
                            ⚠
                            Garlic breath odor
                        
    • 
                        
                        
  • 
                            ⚠
                            Nail brittleness and loss (selenosis)
                        
    • 
                        
                        
  • 
                            ⚠
                            Hair loss (at toxic doses)
                        
    • 
                        
                        
  • 
                            ⚠
                            Gastrointestinal disturbances
                        
    • 
                        
                    

                

                

                
                

                    
Known Interactions

                    
    
                        
                        
  • 
                            ●
                            Cisplatin and other chemotherapy (may reduce drug efficacy)
                        
    • 
                        
                        
  • 
                            ●
                            Statins (may affect selenium status)
                        
    • 
                        
                        
  • 
                            ●
                            Blood thinners (theoretical interaction)
                        
    • 
                        
                    

                

                

                
                

                    

                        Tolerable upper intake: 400 mcg/day (toxicity: selenosis)
                    

                

                
            

            

                Always consult your healthcare provider before starting any supplement.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Selenium help with UV Protection (Internal Photoprotection)?
            
        
        

            Based on 5 studies with 1,800 participants, there is limited but promising evidence that Selenium may support UV Protection (Internal Photoprotection) management. Our evidence grade is C (Some Evidence).
        

    

    
    

        
            How much Selenium should I take for UV Protection (Internal Photoprotection)?
            
        
        

            Studies have used various dosages. A commonly studied range is 55 mcg/day (RDA). Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Selenium?
            
        
        

            Reported side effects may include Garlic breath odor, Nail brittleness and loss (selenosis), Hair loss (at toxic doses), Gastrointestinal disturbances. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Selenium and UV Protection (Internal Photoprotection)?
            
        
        

            We rate the evidence as Grade C (Some Evidence). This rating is based on 5 peer-reviewed studies with 1,800 total participants. The overall direction of effect is positive.
        

    

    




        

        

        
        
        

            

  




            

                
                
                

                
            

        

        

    


    
    






  
References

  
    
    
    
  1. 
      [1]
      Nicole Natarelli et al..
      J Med Food.
      2025.
      Oral Supplements and Photoprotection: A Systematic Review.
      doi:10.1089/jmf.2024.0023
      PubMed
    
    2. 
    
  















    

        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.