Originally Posted by Wednesday_12
I use pretty much everything way past it's expiry date.
Do a small taste test to see if it's rancid, if it's not then it should be fine to use. Even if it is rancid it should be fine to use it will just taste crap!
I wouldn't eat it if it were rancid. Even if it doesn't make you sick, it's just pointless anyway--flax seed is prone to going rancid because it is highly unsaturated and oxidizes easily... however, the whole omega-3 thing literally means there is a double bond on the third carbon in from the methyl end of the fatty acid tail (or, more simply, that there is a double bond in a special place) if that double bond oxidizes, the oil is no longer omega 3.. in fact it's no longer an oil!
so yeah, considering how rancid flax seed both tastes bad and is likely neutral or bad for you... why bother. I keep my ground flax seed in the freezer.. a lot of people advise to just keep whole flax seeds and grind it yourself right before consumption but dude.. so much effort.