Zucchini, along with other squashes and the related marrows, are a good source of vitamin C as well as providing some fibre.
A 100g portion of steamed zucchini provides just over half the vitamin C and a seventh of the folate an adult needs daily. * Zucchini also contain beta-carotene, which the body converts into vitamin A, but they are high in salicylates which may cause food intolerance in some people.