Just incase you don't know-not posting full study-just the main point.
J Sports Sci Med, 2014 vol. 13(1) pp. 192-9
Heavy Resistance Training and Supplementation With the Alleged Testosterone Booster Nmda has No Effect on Body Composition, Muscle Performance, and Serum Hormones Associated With the Hypothalamo-Pituitary-Gonadal Axis in Resistance-Trained Males
Willoughby, DS; Spillane, M; Schwarz, N