RecruitingPhase 3Drug trialGrowth Hormone Replacement Therapy in Veterans With Mild Traumatic Brain Injury (mTBI) and Adult Growth Hormone Deficiency (AGHD)The purpose of this study is to determine whether growth hormone replacement therapy (GHRT) is effective versus placebo in the improvement of Quality of Life in patients with adult growth hormone deficiency (AGHD) and mild traumatic brain injury (mTBI).