4. Vitamin C
A vitamin C supplement can be taken to help boost your immunity. In addition, vitamin c can help repair damage to the tissues in the throat and can decrease your chances of getting a number of different illnesses.
If you feel an infection coming on, take 1000 mg of vitamin C per day. If you are already suffering from an infection up the dosage to 4000 mg. In addition to taking a vitamin C supplement, you can also eat foods that are rich in vitamin C such as strawberries, kale, oranges, kiwi, and grapefruit.
If you are having difficulty swallowing you can use these fruits to make a smoothie.