Answer:
Children, pregnant and nursing women, people with health conditions.
Step-by-step explanation:
Dietary supplement are very popular today but they are not a replacement for a balanced diet. Many supplements contain active ingredients that may be harmful to the body, especially if bought without consulting a health care provider first.
Children that eat a healthy, balanced diet don't need vitamin supplements as the food they eat contains all the nutrients they need to grow and develop properly. Pregnant and nursing women must ask their doctor before taking any kind of supplements as they can interfere with the embryo's development and even cause some birth defects, nursing women may find that some vitamins effect the quality of breast milk.
People with health conditions, awaiting a surgery or recovering from one should always take vitamins under supervision, the same applies to people taking any kind of medicine on a regular basis.