The fruits that contain the most vitamin C: 1, citrus fruits, such as oranges, lemons, grapefruit, oranges, these citrus fruits are often very rich in vitamin C. 2, peach fruits, such as kiwi, peach, these peaches are very rich in vitamin C. 3, date fruits, such as green dates, sour dates, red dates, these dates are also rich in vitamin C content. Very much, is an important source of vitamin C.