also increases blood flow to certain areas of the body.. if I still had my lil library, I could take a pic of an old heat-graph (for a 1960's endocrinology textbook... old school IR photos) that showed before and after pics of the increase in bloodflow/heat in the chest and face just hours after doses of test prop, methyltest, and halotestin (separate pics for each drug on separate hypo-gonandal guys).