susan tuck said:
... On the Norwegian Salmon Oil, it is cold pressed & no metals, etc., however, the company has switched from Norwegian to Alaskan (also checked) because Norwegian Salmon are no longer considered a sustainable resource - over fished.
Well, from the point of view of the person or dog ingesting it, the distillation and/or certification about mercury (and all metals) is more important than the fish's geography (IMO).
From the point of view of using sustainable resources, did you know that small fish are sources of oil with almost exactly the same amounts of DHA and EPA (the really beneficial Omega 3 EFAs)? For example, anchovies and sardines are the source for the oil produced by Nordic Naturals.
Salmon is one of the low-mercury oily larger fish and anchovies and sardines are among the many low-mercury oily small fish.
If it's on this list (companies voluntarily subscribing to a high level of fish oil quality):
http://www.crnusa.org/o3group.html
and is from sustainable sources, then (IMO) you have all bases covered. 8) There are a lot of companies there to choose from, and there are others of very high quality, too. If I were choosing one not subscribing to that voluntary monograph, my top question would be whether it's metal-tested/distilled. (Also, everything I have read has led me to conclude that fish body oil, not liver oil, is preferable.)
All JMO!