birth control
"I was on this for 5 years (and birth control pills for about 12 years), and would have told you how fabulous it was.  <List all the benefits everyone else has listed, here.>  Then a friend of mine convinced me to stop birth control all together for a while, and I turned into a new and better person!  I dropped 5 lbs instantly, had a huge sex drive, more lubrication, and just felt better.  I wouldn't say I was depressed before, but after going off of it, I would describe my time on birth control as feeling like I was inside a cloud.  Less emotions in general, sometimes a little down.  I'm bummed I'm back on it, but it seems to be the least impactful than the others.  I might try Paragard to avoid the hormones."