What are vitamins classified as?

Vitamins are classified as organic compounds because they are made up of carbon and are essential nutrients that the body requires in small amounts for various physiological functions. These compounds are crucial for processes such as metabolism, immunity, and the maintenance of healthy skin and vision. Unlike minerals, which are inorganic and do not contain carbon, vitamins play a pivotal role in biochemical reactions as coenzymes or precursors to enzyme activity.

In contrast, macronutrients refer to the primary nutrients that provide energy — carbohydrates, proteins, and fats — rather than the micronutrients which include vitamins and minerals. Synthetic substances, while they can refer to molecules manufactured artificially, do not align with the natural classification of vitamins, which are primarily derived from food sources. Therefore, the classification of vitamins as organic compounds highlights both their chemical nature and their essential role in human health.