Vitamin A (retinol) References
    
        
        
            
        
            Armstrong AW, Cheeney S, Wu J, et al. Harnessing the power of crowds: crowdsourcing as a novel research method for evaluation of acne treatments. Am J Clin.Dermatol. 12-1-2012;13(6):405-416. 
  Bjelakovic G, Nikolova D, Gluud LL, et al. Antioxidant... 
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