34 citations
,
  March 2007   in “Biochemical and Biophysical Research Communications”    Thioredoxin reductase 1 does not affect glucocorticoid receptor activity in hair follicle cells.  
               22 citations
,
  July 2015   in “PloS one”    Foxp1 helps control hair stem cell growth and response to stress during hair growth cycles.  
     
           84 citations
,
  July 2003   in “European journal of biochemistry”    Mouse skin can produce and process serotonin, with variations depending on hair cycle, body location, and mouse strain.  
     
           75 citations
,
  June 2019   in “International Journal of Molecular Sciences”    Costunolide may have multiple health benefits, including promoting hair growth and protecting against cancer and diabetes, but more research is needed.  
     
           119 citations
,
  July 2016   in “Annals of the New York Academy of Sciences”    Vitamin D has potential benefits for cancer prevention, heart health, diabetes, obesity, muscle function, skin health, and immune function, but clinical results are mixed and more research is needed.