Testosterone
"I'm a 47 year old who started out with 4 pumps of 1% Androgel after a few weeks my levels went from 250 to 450.  General health I felt a lot better. Noticed improvement in my energy level. I was having a very difficult time motivating and always feeling weak. My energy level has come back. After about 2-3 weeks my doctor switched me to 2 pumps of the 1.62% Androgel.  I still have my energy, but now having some of the side-effects listed.  My urination is not so good.  Short streams and much more often.  Another side-effect is my breathing.  Seem to have a heavy chest and some difficulty breathing.  I'm going to see if I can go back down to the 1% gel to see if that helps."