A high intake of vitamin C has been shown to reduce the risks for virtually all forms of cancer, including leukemia, lymphoma, and lung, colorectal, and pancreatic cancers as well as sex hormone related cancers like breast, prostate, cervix, and ovarian cancers. Vitamin C is your body's first and most effective line of antioxidant protection. Vitamin C protects cell structures like DNA from damage and it helps the body deal with environmental pollution and toxic chemicals. Vitamin C enhances immune function, and it inhibits the formation of cancer causing compounds in the body (such as the nitrosamines, chemicals produced when the body digests processed meats containing nitrates).

Dr. Douglas Brodie states in the book, Alternative Medicine Definitive Guide to Cancer, "Each one of us produces several hundred thousand cancer cells every day of our lives. Whether we develop clinical cancer or not depends upon the ability of our immune systems to destroy these cancer cells. That's because cancer thrives in the presence of a deficient immune system."

Here is a list of foods high in vitamin C. Adding these foods to your daily diet will help boost your immune system which will aid you in fighting off many diseases as well as cancer.
Fruits and vegetables are both high in Vitamin C. The highest are papaya, raw red and green peppers, oranges, cantaloupe, broccoli, cauliflower, strawberries, Brussels sprouts, baked potato, cabbage, green peas, kiwi fruit, and kale.

There are a few good vitamin C supplements on the market but one that I particularly am using at present to super charge my immune system is Emergen-C Super Energy Booster which has 1,000mg of vitamin C along with vitamin B and 32 mineral complexes.