cranberriesWatermelon Vegetables with the highest sources of vitamin C include:Broccoli, Brussels sprouts, cauliflowerGreen and red peppersSpinach, cabbage, turnip greens, and other leafy greensSweet and white potatoesTomatoes and tomato juiceWinter squashSome cereals and other foods and beverages are fortified with vitamin C. Fortified means a vitamin or mineral has been added to the food.