I think it says to keep it in the fridge, even if it's unmixed. Look at the box, it should say storage temp, been a while since I looked but mine's chillin.
***It is not necessary to store the unmixed HCG in the refrigerator; however, it should be kept out of light and below a temperature of 25° C.***
Well, if the box says keep it in the fridge I'm gonna keep it in the fridge, cause it doesnt mention if it's gotta be mixed to be in the fridge. Good question tho. Maybe it's not necessary but it wont hurt.