Vitamin C is great for your immune system. When administered intravenously, high doses of Vitamin C will exclusively attack cancer cells, leaving healthy tissue unharmed. You may be surprised to find that cancer cells are quite fragile. They are killed via changes in acidity or with the addition of oxidative stress. The intravenous use of Vitamin C at high doses has proven to cause cancer cells to die.
High doses of Vitamin C interact with iron and other metals to create hydrogen peroxide. In turn, these high concentrations of hydrogen peroxide damage the DNA of cancer cells, shut down their energy supply and the cancer cells die. Best of all, Vitamin C selectively kills only cancer cells - no matter how high the concentration is, Vitamin C does not harm healthy cells. The only effective method to get levels of Vitamin C to the concentrations required to kill cancer cells is to give it intravenously.