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Vitamin A (Retinol) para Acne

C

Oral vitamin A supports keratinocyte differentiation and may help normalize follicular keratinization. Topical retinoids have strong acne evidence; oral vitamin A at safe doses has more limited data.

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Conclusão

            
            
Oral vitamin A supports keratinocyte differentiation and may help normalize follicular keratinization. Topical retinoids have strong acne evidence; oral vitamin A at safe doses has more limited data.

            
            
        

    











    
    

        
        

            

  
Key Statistics





            


    

        
6

        
Estudos

    

    

        
400

        
Participantes

    

    

        
            
            ↑
            
        
        
Positive

    

    

        C

        
Nota

    




        


        
        

        
        
        

            

  
Dosage & Usage





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


            
            

                
Dosagens Comumente Utilizadas

                

                    
                    

                        
general:

                        
700-900 mcg RAE/day (RDA)

                    

                    
                    

                        
skinhealth:

                        
700-900 mcg RAE/day (do not exceed UL)

                    

                    
                

                
                

                    Limite superior: 3,000 mcg RAE/day (10,000 IU preformed vitamin A) — teratogenic at high doses
                

                
            

            

            

            
            

                Melhor horário: With meals containing fat
            

            
        

        

        
        
        

            

  
Safety & Side Effects





            

                
                

                    
Efeitos Colaterais Relatados

                    
    
                        
                        
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                            ⚠
                            Headache and nausea at high doses
                        
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                            ⚠
                            Skin dryness and peeling (hypervitaminosis A)
                        
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                            ⚠
                            Liver toxicity with chronic excess
                        
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                            ⚠
                            Birth defects (teratogenic — pregnancy contraindication)
                        
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Interações Conhecidas

                    
    
                        
                        
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                            ●
                            Retinoid medications (additive toxicity risk — do not combine)
                        
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                            Tetracycline antibiotics (increased intracranial pressure risk)
                        
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                            Anticoagulants (high-dose vitamin A may increase bleeding risk)
                        
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                            Hepatotoxic drugs (additive liver stress)
                        
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                        Ingestão máxima tolerável: 3,000 mcg RAE/day (10,000 IU preformed vitamin A) — teratogenic at high doses
                    

                

                
            

            

                Consulte sempre o seu profissional de saúde antes de iniciar qualquer suplemento.Sempre consulte seu profissional de saúde antes de iniciar qualquer suplemento.
            

        

        

        
        
        

            

  
Frequently Asked Questions





            




    
    

        
            Does Vitamin A (Retinol) help with Acne?
            
        
        

            Based on 6 studies with 400 participants, there is limited but promising evidence that Vitamin A (Retinol) may support Acne management. Our evidence grade is C (Some Evidence).
        

    

    
    

        
            How much Vitamin A (Retinol) should I take for Acne?
            
        
        

            Studies have used various dosages. A commonly studied range is 700-900 mcg RAE/day (RDA). Always consult your healthcare provider before starting any supplement regimen.
        

    

    
    

        
            Are there side effects of Vitamin A (Retinol)?
            
        
        

            Reported side effects may include Headache and nausea at high doses, Skin dryness and peeling (hypervitaminosis A), Liver toxicity with chronic excess, Birth defects (teratogenic — pregnancy contraindication). Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
        

    

    
    

        
            How strong is the evidence for Vitamin A (Retinol) and Acne?
            
        
        

            We rate the evidence as Grade C (Some Evidence). This rating is based on 6 peer-reviewed studies with 400 total participants. The overall direction of effect is positive.
        

    

    




        

        

        
        
        

            

  
Related Evidence





            

                
                
                

                
                

                    
Vitamin A (Retinol) para outras condições

                    

                        
                        
                            Aging Skin & Wrinkles
                            C

                        
                        
                        
                            Keratosis Pilaris
                            D

                        
                        
                    

                

                
            

        

        

    


    
    












    

        Aviso Legal da FDA:
        Estas declarações não foram avaliadas pela Food and Drug Administration. Os produtos e informações neste site não se destinam a diagnosticar, tratar, curar ou prevenir qualquer doença. As notas de evidência apresentadas são baseadas em nossa análise de pesquisas revisadas por pares publicadas e não constituem aconselhamento médico. Sempre consulte seu profissional de saúde antes de iniciar qualquer regime de suplementação.