Cod liver oil has a long history of use as a medicine and health product, a history that is still going on today. Its popularity has waxed and waned with changing medical knowledge and cultural preferences, but it has survived -- Scott's Emulsion is available today in nearly its original formula (
although you will need to order it from Indonesia).
When Scott and Bowne began marketing their emulsion in the 1870s it was widely used for "consumption" and all "Wasting Diseases," which would have included tuberculosis, a leading cause of death at the time. In the early 20th century the marketing changed dramatically, after the discovery of vitamins and the role they play in promoting healthy growth and preventing diseases such as rickets (caused by a deficiency of vitamin D). Cod liver oil is one of the best natural sources of vitamins A and D. Soon every mother was admonished to give her children a daily dose of the oil -- a practice that began in the 1920s and continued well into the 1950s...
(http://www.theatlantic.com/)(underscoring mine)
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