I have tried several different brands of HCG from online pharmacies. After reconstituting the HCG, I find it has about a 3 week shelf life (refrigerated). After that, it looses potency. If you accidentally forget to refrigerate it after reconstitution, throw it out! I had one bottle sit a room temp for a few hours. Not sure if it was still good, I risked it and took a shot. It left a golf ball sized welt at the injection site for about 4 days. It look like the biggest mosquito bite ever, and it hurt to touch.

I would like to add that I have only received generic types of HCG...so I am not sure if the name brand stuff last longer.