Vitamin C does help with the flu because it helps boost your immune system.
The Vitamin C helps boost your immune system which helps fight off the flu virus as well as many other viruses as well.
Vitamin D boosts your bodies immune system even more and although Vitamin C is good for the flu to help get rid of the flu and even prevent the flu you should also increase your intake of Vitamin D.
Vitamin D is even better for helping fight off the flu and helping boost your bodies immune system as well.
Eating healthy, eating foods that contain vitamin c, vitamin d and other vitamins or taking Vitamin C, Vitamin D and other vitamin supplements can also help keep your body healthy and prevent the flu and help you recover from the flu much faster as well.