Vitamin C is one of the most consumed nutritional supplements with a long history of health benefits. Before it was discovered in 1932, the English navy had used citrus fruits to prevent fatal diseases such as Scurvy. Vitamin C is essential to the formation of collagen, the protein "cement" that holds our cells together. Think of cells like bricks in a wall. The strength of a brick wall is not really in the bricks but it is in the cement between the bricks. Collagen is this cement that holds your cells together. If collagen is abundant and strong, your cells hold together well. If cells stick together, tumors have a tough time spreading through them. Strong collagen can thereby arrest the spread of cancer. Vitamin C is required for our immune systems to generate and mobilize the leukocytes that fight cancer. In a 1995 publication, several physicians presented evidence that vitamin C (ascorbic acid) is preferentially toxic to cancerous cells. In other words, vitamin C kills cancer cells while leaving normal cells alone. Vitamin C is also necessary to produce hemoglobin, the oxygen-carrying pigment in red blood cells and helps improve iron absorption from the intestine. And if that's not enough reason to take vitamin C, vitamin C is a powerful antioxidant effective at neutralizing free radicals.