Publications and Resources. Read the groundbreaking 1977 publication â Phylogenetic structure of the prokaryotic domain: The primary kingdoms ,â by Carl R. Woese and George E. Fox, in which Archaea, the third domain of life, is identified.
Youâre quite right that cod liver oil is a good source of vitamin D. According to the National Institutes of Health, it gives you 1,360 IU per tablespoon (I now recommend 2,000 IU daily). However, at least some kinds of cod liver oil provide as much as 13,500 IU of vitamin A, and thatâs way too much. The Upper Limit of vitamin A set by the Food and Nutrition Board of the National Academy of Sciences is 10,000 IU per day.
The best thing about cod liver oil is that it contains high amounts of omega-3 fatty acids. You get these fatty acids from healthy, fresh fish (such as salmon, sardines, or mackerel). On top of that, cod liver oil contains plenty of vitamin D. In fact, cod liver oil is a natural source of vitamin D. These essential nutrients relieve inflammation, combat blood clots, enhance brain health, and reduce the symptoms of depression.