21 gold vitamin contains a variety of vitamins and minerals, mainly used to prevent and treat diseases caused by vitamin and mineral deficiencies. 21 gold vitamin side effects include the following: i. Gastrointestinal reactions, although 21 gold vitamin contains a variety of vitamins and minerals, in a small number of patients may still experience digestive system reactions, such as upper abdominal discomfort, nausea and other symptoms. Second, allergic reactions, a small number of patients may appear itchy skin, allergic situation. Third, drug interactions, for example, 21 gold vitamin contains vitamin A, the body’s demand for vitamin A is not large, long-term large amounts of gold vitamin may appear vitamin A overdose, or 21 gold vitamin and contain calcium and magnesium drugs taken at the same time, may cause hypercalcemia, hypomagnesemia, so 21 gold vitamin needs to be applied under the guidance of a doctor.