At the first sign of a runny nose many of my patients load up on Vitamin C for its protection and relief from the common cold. Some take vitamin C in supplement form whereas others prefer to stock up on juices and fruits. What most people are surprised to learn is that an orange does not top the list of fruits for vitamin C content although it is the most common. Other fruits such as guava, kiwi, and strawberries actually contain more vitamin C than citrus.