Phil, I get it regarding concerns for getting enough Vit. D. And it seems like a plausible payoff ( even if the oil is oxidized). I would like to turn it around, and suggest you find a lab report that has done an oxidation study on this oil. Pretty hard to imagine it's out there,,,. I've said this before,, just because some ancient peoples ate a certain food doesn't mean it's healthy for us. And in the case of the Inuit etc, survival was key. As was appeasing their sense of taste, just like we need that appeasement, especially when bored. And I imagine living in a ice house for long periods became just that. And yes, I think the tingling would go away, just as many harsh signals go away from foods and drinks after the initial warning; look at the first puff on a cigarette, or drink or wine, or whiskey... So, none of these inferences persuade me. You've quoted Ray Peat with applaud from time to time. Yet you don't seem to heed his warning on pufa's? And of course it's sane to use what seems appropriate from these 'educators'. Speculations about the fermenting process keeping the pufa from being oxidized. Was there any science behind that, or was that marketing?
Regarding krill oil. I personally called the processing plant that processes Mercola's product. Yes, they use heat. And no, I haven't thought of using it since I found it out. As I may have mentioned before,,, I spent weeks if not months trying to search out any cold processed fish oil. I found one in Alaska, and one in Norway,, some years ago. I bought small samples of each ( both had been produced just weeks if not days before it landed at my door. Both had a disgusting oxidized bite and smell ( and I'm not talking bad fish odor). The same is true of the many times I've bought flax seed oil. From Barleens, literally days after it's been pressed ( as in the next day) I had it next dayed to me. Tasted fine the first day,, after one week in the fridge, it developed a bite. The same experiment I tested years ago with wheat germ. Years ago there was a product called next day fresh. It was shipped next day to health food stores around the country. I got to my health food store, was buying six day old wheat germ in the fridge ( head inside the bulk fridge door ) and the ups guy walks up and places the 3 gallon pail inside the door,, milled the day before. The difference was astounding. Right there, tasting one, then the other, the six day old tasted fine until I sampled the one day old germ. It was only then that I noticed the bite of oxidized wheat germ (oil). I know what oxidation tastes and feels like. And I have to admit, now that my ducks aren't laying right now ( three times higher in Vit D than chicken eggs) I too have been tempted to experiment with cod oil. But not heated, chemically refined.....