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The discovery of vitamins was a major scientific achievement in our understanding of health and disease.casimir funk originally coined the vitamine .the major discovery of vitamine began in 19th century
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William Fletcher was the first to determine in 1905 that if special factors(vitamins) were removed from food diseases occurred.It was found that eating unpolished rice prevented a disease called Beriberi while eating polished rice did not.So scientists thought that the husk of rice contained vitamins.
This led to the discovery of vitamins.
Elmer V. McCollum and M. Davis discovered vitamin A during 1912–1914
Hope I helped u:) 

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