If you want to take some Vitamins to get rid of cold sores you need to take Vitamin C which you can get it in pill form or eat foods that contain Vitamin C.
Taking Vitamin C when you have a cold sore or before you have a cold sore is good because Vitamin C is a great antioxidant and a potent immune booster as well as being antiviral which can help ward off cold sores and prevent cold sores from ever occurring in the first place.
You can also apply some apple cider vinegar to the cold sore using a cotton swab and apply the apple cider vinegar to the cold sore 3 times per day and the apple cider vinegar will get rid of the cold sore by killing the virus causing the cold sore.