Many vitamins our bodies rely on come from external factors like what we eat. The primary cause of vitamin deficiency for many people is a lack of vitamins in their diet.
A well-balanced diet has a variety of food groups and types of food. It can be especially tricky if your diet is dictated by specific intolerances or lifestyle choices like veganism or vegetarianism.
Certain medical conditions, pregnancy, medications, and alcohol use can also increase your risk of vitamin deficiency.