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.
It's best to get cod liver oil by eating the whole fish. However, omega-3 fatty acids are so important for your heart health that you should consider taking a supplement of 500 milligrams daily if you do not eat fish or other foods rich in omega-3 fatty acids, according to the Harvard School of Public Health.ne tablespoon of cod liver oil contains about 2.4 grams of combined EPA and DHA, which are the two omega-3s in fish oil.