Vitamin C is a very important nutrient needed for maintaining a healthy immune system. It is known to help in wound healing, keeping the bones strong, and helping with brain function (20). Since it is a water-soluble vitamin, it doesn’t get stored in the body. The excess dissolves in the water and gets excreted in the urine.  Sometimes, this can prompt some to go overboard with excessive intake. Over-supplementing with Vit C can cause digestive distress, like diarrhea and nausea (21). To conclude, although water-soluble vitamins like Vit C are fairly safer than fat-soluble ones, it is better not to exceed the tolerable upper level (22).