Cod liver oil has been a popular food supplement since at least the Viking times and has been supposed to have various health benefits at different times. In the Victorian period, the idea that a daily dose of cod liver oil could help you keep warm throughout the winter was widespread. Today we know that cod liver contains many vitamins and minerals instrumental in maintaining good health. Moreover, it has actually been proven to help circulation, generating warmth in the fingers and toes, and thus the Victorian hypothesis can be assumed to be correct.
Wellcome Archive 1927. Wikimedia Commons.
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