Vitamin C is very important, especially back when it was hard to come by on ships, which is why oranges were eaten on ships to prevent scurvy.
Yes, I love oranges, which I know help in the Vitamin C area.
Vitamin C
Vitamin C, also known as ascorbic acid and -ascorbic acid, is a vitamin found in various foods and sold as a dietary supplement. It is used to prevent and treat scurvy. Vitamin C is an essential nutrient involved in the repair of tissue and the enzymatic production of certain neurotransmitters. It is required for the functioning of several enzymes and is important for immune system function. It also functions as an antioxidant. 
Current evidence does not support its use for the prevention of the common cold. There is
typically lemon or an orange, can also be soaked in water in a coffee filter, and drunk.
Uses Medical.
Citrus fruits have well-documented nutritional and health benefits. They can actually help prevent and cure some diseases.
Citrus fruit intake has been associated with a 10% reduction in odds of developing breast cancer.
Oranges were historically used for their high content of vitamin C, which prevents scurvy. Scurvy is caused by vitamin C deficiency, and can be prevented by having 10 mg of vitamin