Caffeic acid N [3,5 bis(trifluoromethyl)phenyl] amide as a non steroidal inhibitor for steroid 5 reductase type 1 using a human keratinocyte cell based assay and molecular dynamics Scientific Reports Understanding 5 Alpha Reductase Inhibitors Good Health by Hims An Updated Etiology of Hair Loss and the New Cosmeceutical Paradigm in Therapy: Clearing 'the Big Eight Strikes' Clinical biochemistry of dihydrotestosterone Paula M Marchetti, Julian H Barth, 2013