How do I find out? Or, rather, how bad would the smell be?
The best before date is early 2009, so it should obviously be fine. I'd rather be sure, though, since taking no fish oil is much better than taking rancid oil!
It's in gelcaps, refrigerated. I cut one open, and smelled it; not too bad (not pleasant, though).
The saying is usually "if it's rancid - you'll know". I suppose that means I'm just overly paranoid then?