Vitamins are organic compounds your body needs to grow and function properly but, sometimes, can't produce on its own. They are found in different food groups in varying amounts. When you ingest them, vitamins regulate chemical processes throughout your body, enabling it to perform essential functions. A deficiency in any vitamin, if left untreated, can lead to serious health problems like: Blindness Anemia Skin diseases Cardiovascular disease Therefore, testing for vitamin deficiencies is important to recognize the need for a specific treatment and improvement in your diet to ensure good health.