Sweet chestnuts come from the widely cultivated Castanea sativa tree and are often enjoyed as a simple snack, roasted whole. Rich in vitamins and minerals, the sweet tasting nut contains a number of compounds with antioxidant properties that help to provide skin-protecting benefits. In beauty products, the chestnut’s flavonoid and tannin content also lend it toning and astringent properties, helping skin to feel fresh and toned.