It's near impossible to eliminate PUFAs. Tallow has omega 3 & 6's but because they're combined with 30 odd times more saturated fat, it's stable. I'm convinced that this omega 3:6 ratio bullshit is just to sell fishing waste as a health food product. Fish oils didn't become a product until we banned the dumping of fish guts & bones into the ocean. Seed oils are unstable at body temperatures & in an oxygen rich environment. They screw your mitochondria & hence your metabolism. Keep taking your linseed oil & fish waste believing it's helping your cellular balance though.