Vitamin C is known scientifically as ascorbic acid. This antioxidant vitamin is prevalent in a lot of citrus fruits, including kumquats. A 100 gram serving contains nearly 44 milligrams. The recommended daily intake is 75 milligrams a day for women over 18 and 90 milligrams a day for men in this same age group. Vitamin C aids wound healing, promotes healthy connective tissue and also helps absorb free radicals.