TLDR  Finasteride 1 mg significantly improves hair growth in men aged 41 to 60 with male pattern hair loss.   
  A 24-month double-blind, randomized, placebo-controlled study involving 424 men aged 41 to 60 years with mild-to-moderate vertex male pattern hair loss demonstrated that finasteride 1 mg significantly improved hair growth compared to placebo. Efficacy was assessed through global photographs, patient self-assessments, and investigator clinical assessments at 6-month intervals. Significant hair growth improvement was observed from Month 6 and maintained through Month 24 (p < 0.001). The treatment was generally well tolerated, with safety analyses including clinical and laboratory adverse experiences.
          
     
           August 2018   in “Oxford University Press eBooks”    The document's conclusion cannot be provided because the document cannot be parsed.  
     
           36 citations
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    Men with untreated male pattern hair loss continue to lose hair over a 5-year period.  
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