HCG shelflife?

As the title says what is the shelflife of HCG. Or how long can it be safely stored for.
Thanks

Bump

I had used some by novarell that came in a 10,000iu multi dose vial. The directions said that the hormone is stable for up to 6 weeks in a refrigerated environment. If you're using the individual amps, I would either use it in one single dose or two at the most. Due inpart to the fact that the open amp would leave room for contamination.

iwas told 2 wks