Vitamin C is a must to protect you against infections and help build your immunity.
 

Strawberries :

Just a handful of strawberries is an ideal snack. Apart from this, strawberries are known to be a good source of fibre and manganese and also rich in vitamin C. Crush the strawberries, add a little milk and turn it into a wonderful smoothie.

Papayas :

Papayas are loaded with vitamin A, C, potassium and fibre. And though it's not a fruit that is easy to find during the winter, yet if you turn it into a smoothie or just eat it raw — you are surely going to get your daily dose of vitamin C.

Oranges :

We all know that oranges contain vitamin C. They are known to the most recognised fruit that gives people a healthy dose of this vitamin. You know one thing.... merely the scent of this fruit is known to lift people's mood and make them happy.

Bell peppers :

One cup of green bell peppers are known to contain about twice the amount of vitamin C. Bell peppers are known to be one of the best natural sources of this vitamin. Add it to your salad or soup to make it healthier.