Everyone knows about vitamin C. It's added to fruit snacks and if any is lost, it's even added back into fruit juices that are sold at the grocery store. Most people think of vitamin C as a vitamin to fight the common cold, but if you look at the history of this important vitamin, you discover that some of the original studies tested vitamin C in terminally ill cancer patients and found that it extended their survival.
Vitamin C is one vitamin that your body doesn't make (like we can make vitamin D with sunlight), and your body doesn't store vitamin C (the way we can store fat-soluble vitamins like A, D, E and K). This means it's important to make sure you are eating foods that contain vitamin C every day (or take a supplement).
Since your body uses vitamin C for growth and repair of tissue in all parts of the body, making sure you consume plenty of vitamin C is critical as you are recovering from cancer treatment, keeping your body strong, and rebuilding your immune system.