Sweet peppers and their cousins, hot peppers, are known to be very nutritious, with high doses of powerful antioxidants. Sweet peppers are always near the top of the list of the healthiest vegetables. Their most significant nutrients are dietary fiber, vitamins A, C, K and B6. They are also high in potassium and magnesium. Sweet peppers’ most salient virtue is an exceptionally high vitamin C content. Recent nutritional research has also shown sweet peppers to be high in antioxidants and to boost the immune system (preventing diseases), not to mention their ability to reduce inflammation in the body. Sweet peppers are regularly cited as one of the five most nutritious vegetables.