It is well-known that dragon fruit contains many useful substances, such as vitamin C, proteins, iron, fruit acids, antioxidants, fiber, tannin, dietary fiber, and minerals. It has a positive effect on the heart muscle and also normalizes the functions of the intestines and stomach. Dragon fruit is also useful for people with diabetes. In addition, due to the content of tannin, pitahaya is useful for those with impaired eyesight.