I always kept mine in the fridge if at all possible. Are you happy with the results? I was REALLY keen on it about four years ago, but it's a pain in the ass. I ended up selling what I had to a gay guy in my gym for a exorbitant price. I took the cash, and bought a Glock 27.
I started getting red marks and brusing and figured it was dirty or something was up. I am using a transdermal PGF2A product right now by lab up here QFS which is working very nicly, and you don't get the nasty sides like with injections.