Is flaxseed oil as good as fish oil?
It is different. Flaxseed provides ALA, which the body converts to the longer-chain forms in fish oil only to a limited extent.
Can I cook with it?
No – heat destroys it. Use it on food after cooking.
Does it need refrigerating?
The liquid does, once opened, and should be used within the weeks stated.
How do I know if it has gone off?
It smells sharp, bitter or like old paint. If so, do not use it.