This conclusion is essentially the same as the conclusion reached by the Weston A. Price Foundation and the research of Chris Masterjohn; we have continually pointed out that vitamins A and D work together and that without vitamin D, vitamin A can be ineffective or even toxic. We do not recommend Nordic Naturals regular cod liver oil or any brand of cod liver oil that is low in vitamin D. But it is completely inappropriate to conclude from this 2004 study that cod liver oil is toxic because of its vitamin A content. Similar reviews could be put together showing the benefits of vitamin A and cod liver oil in numerous studies, including the studies from the 1930s. Obviously the solution is to use the type of cod liver oil that people took in the 1930s, which did not have most of the vitamin D removed by modern processing techniques.
http://chriskresser.com/separating-fact-from-fiction-on-cod-liver-oil
It's not that we recently discovered that humans eating a western diet need both fish oil and liver product supplementation - we rediscovered it.
It's not that we recently discovered that humans eating a western diet need both fish oil and liver product supplementation - we rediscovered it.
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