A Guide to 15 Foods High in Vitamin C

9. Grapefruit

The grapefruit diet might not be as trendy as it once was, but grapefruit is still an excellent source of nutrients. A great source of vitamin C, of course, the citrus fruit also contains vitamin A, potassium, and fiber. Grapefruits also offer lycopene, which has been shown to fight cancer-causing cells and reduce the risk of developing tumors. Research shows that grapefruit improves heart health, making it a good option for those with cardiovascular issues. You can drink grapefruit juice and get many of the same health benefits, but eating half a fruit for breakfast or as a mid-afternoon snack is ideal.