Steroids have been proven to increase “nitrogen-retention in humans which acts as a stimulant for the formation of cellular protein” (Kruskemper 45). Increased nitrogen retention is paralleled with a higher level of potassium, phosphorus, calcium, and water in humans. “This shift can be directly correlated to accelerated weight gain” (Kruskemper 46). In effect, the nitrogen retaining property of testosterone allows for humans to gain muscle mass so quickly. Besides nitrogen retention, increased muscle mass is caused by testosterone’s ability to increase the size of muscle cells.
