Vitamin C is an extremely powerful antioxidant that helps to rid the human body of free radicals. It protects our cells and is considered to be the most important nutrient needed to sustain a healthy and properly functioning immune system. Food sources rich in vitamin C include oranges, kale, cabbage, tomatoes, strawberries, spinach, broccoli, potatoes, brussel sprouts, and cauliflower. This is commonly found in any multivitamin for women or any multivitamin for men. Supplementation the diet with Vitamin C may be an advantage or even necessary in order to maintain a good level of health.