Inclusion Criteria  A plan for a primary rotator cuff repair Male sex >1 cm tear width, full thickness supraspinatus/infraspinatus tear  Exclusion Criteria  Active infection Pre-operative testosterone supplementation Known diagnosis of secondary testicular failure or testosterone deficiency Medically unfit for operative intervention Revision surgery Unwillingness to participate in the study, including post-operative imaging Inability to read or comprehend written instructions Prisoner Concomitant patch augmentation or tendon-transfer Untreated prostate cancer Liver disease Pituitary or hypothalamic dysfunction