hello i'm new to this page, and i tried to find the answer to my question on the forum but could not. i have some equipoise that is kind of old. its a 50 cc jug and i went halves on it with a friend. he took his half then gave me the bottle when he was done. i decided i didn't want to do it at that time and i saved it away in a dark, cool spot. but it has been sitting for some time and i was wondering if there could be a chance since it was already opened that it may be no good. could someone give me an estimate on an opened bottles shelf life?