I'm sure you will hear alot of answers telling you to "pin that shit", or "send it to me". I will put my own spin on what I would to with old gear.
I would toss it. With it sitting in a hot and humid environment, it probably has degraded somewhat just due to the conditions. There are a couple of sponsors here with no minimum and you can pick up some ace on the cheap.
OLD GEAR STORED IN DARK COOL PLACE
I would and have used gear that is a year or so old if it's been stored properly.
When the person makes your gear they probably sit a beaker in a double boiler. High temperature, high humidity. Temperature won't do anything to your gear unless you get it hot enough to degrade the hormone and then it would just be less effective. Humidity wouldn't get in the sealed vial.