What is vitamin D? While the question would seem to call for a simple answer, the query hasn’t always prompted as straight forward a response as one might expect. Researchers often squabble over whether to classify vitamin D as a “vitamin,” a “hormone,” a “pro-hormone,” a “pre-hormone,” an essential “nutrient” and more. This might lead you to ask, then why do we call vitamin D, vitamin D?
The field of nutrition took off in the nineteenth century by German chemists. They believed that an adequate diet solely consisted of proteins, carbohydrates, fats and minerals; unaware of nutrients we now call vitamins.