![]() Ever since, scientists have defined vitamins as organic (carbon-containing) chemicals that must be obtained from dietary sources because they are not produced by the body's tissues. Vitamin D is one of the 13 vitamins discovered in the early 20th century by doctors studying nutritional deficiency diseases. Research results suggest that vitamin D may have a role in other aspects of human health. ![]() But solving the problem of rickets was only the beginning of research into vitamin D. Within a decade, the fortification of foods with vitamin D was under way, and rickets became rare in the United States. Vitamin D was discovered in 1920, culminating the long search for a way to cure rickets, a painful childhood bone disease.
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