I used to participate in the nutrition forums at mothering.com and there are lots of WAPFers there. Cod liver oil would come up a lot. Anyway, one of the things that got brought up was that Weston Price himself advised strongly against taking cod liver oil without the high K2 butter oil. He said it would start to actually cause ill health if taken without the high K2 butter oil. I think he wrote about it in some of his correspondence (he wrote letters to his nieces and nephews).

Ah, I just googled a bit and found this: http://www.ppnf.org/catalog/ppnf/Ar...PriceLetter.htm doesn't mention the butter oil, but does touch on toxicity of CLO all by itself