Which bottle did you get? The one with the white shrink sleeve, the new looking one? - There should be NO REASON AT ALL why you would get a expired bottle from NTBM ever. The store turns over stock so quickly that every bottle that gets shipped is hardly ever more than 120 days old on products like N2 Guard. Some products that are slow movers maybe take 10 months to turn over a batch. Our stuff ships pretty fresh, and some times guys get the bottle less than a week after the pills are pressed.
At the bottom of every bottle it should have a "MFG ON:" stap in yellow laser ink. Right now the lot being shipped by NTBM is using a bottle that says "MFG ON:10/12" which is basically about 60 days ago it was made.
Take some pics of the bottle and let us see. No matter what NTBM will make good on it's 100% customer satisfaction guarantee, but I'm just curious as o where you are seeing this exp date and what bottle you have.