Vitamin C, also known as ascorbic acid, is necessary for the growth, development and repair of all body tissues. It’s involved in many body functions, including formation of collagen, absorption of iron, the proper functioning of the immune system, wound healing, and the maintenance of cartilage, bones, and teeth.

Postofast powder is used before the colonoscopy (endoscopic examination of the large intestine through a flexible tube called a colonoscope) and barium enema X-ray (exam used to detect the changes in the colon of the large intestine by injecting the barium) to clear bowel movements.