It depends on where you get your cod liver oil from. Most probably aren't that great. Kresser (and WAPF) recommend Green Pasture/Blue Ice, as they make it fermented (without heat) using an age old traditional process and test for purity:flyingpylon wrote: I had a doctor tell me to switch from cod liver oil to fish oil because there are more toxins present in the liver (or something along those lines). Is that just bad advice? If you compare the labels on a bottle of fish oil vs cod liver oil there is very little to distinguish between them which makes it difficult for consumers to know which to choose. I'd be interested to know if anyone has more info/opinions on this or could point me to a good resource.
Purity Statement
Update on Cod Liver Oil Manufacturing, Returning to Traditional Production Techniques for the Quintessential Sacred Food
Basically, you need to do your research. Toxins are also typically stored in the fats of the animal so any fish oil needs to be vetted in the same way.
But, I don't think everyone needs to take Fermented Cod Liver Oil. It's just a natural-ish super-food way to get fat soluble vitamins A,D,E and K — you could just as well take those supplements separately if you wanted to. Many people just take FCLO seasonally, during the Winter, when it's harder to obtain those vitamins from foods/sun. And it's hard to get all your Vitamin D from FCLO, so many people have to supplement D a bit in addition to it.
