I saw the post from Raheeb. All I know is that my Bimix was received in a cold pack and it was noted on the instructions to keep it refrigerated. I had read somewhere else that the shelf life unrefrigerated was three months and refrigerated it is six months. The expiration date on my Bimix is six months from the date of shipment. It now is about four months old and still has the same punch.
The pharmacist told me the same thing, pretty much, when I picked up the Bimix today. My bad, sorry if I confused anyone. If I understand correctly, though, it (Bimix) does not go bad as quickly as PGE1.