Vitamin C & Vitamin D: 7 Things you need to know As all of us focus on keeping healthy at home, many may wonder what we can do to strengthen our bodies and immune system to battle any infection. Both Vitamin C and Vitamin D play a key role in helping us combat infections but in very different ways. Though both of these are vital to our health, there are many lesser-known facts about them which may help you. Here are some interesting facts: Vitamin C can be obtained from various fruits and vegetables while Vitamin D is available in foods like eggs, fatty fish, fortified dairy products and most importantly, sunlight allows our body to synthesize vitamin D naturally. All fruits and vegetables are natural sources of vitamin C. Citrus fruits like oranges, lemons, grapefruits, guavas, mangoes, gooseberries, strawberries, red and green bell peppers, and kiwis have high levels of this vitamin. Infants are dependent on breast milk, sunlight, and vitamin D supp