Rose hips contain the seeds of the rose plant. Dried rose hips and the seeds are used together to make medicine. Fresh rose hips are a rich source of vitamin C, so they share many uses with vitamin C including preventing and treating colds, flu, and vitamin C deficiencies. In addition, the various flavonoids in rose hips have potent antioxidant action. Rose hips contain anti-inflammatory properties and may be used to support healthy joints. Rose hips have a tart flavor and can be used to make jelly, jam, soup or oil, or can be alternatively used to flavor tea. The fruit acids and pectin in rose hip tea is a mild diuretic and laxative. It is used to improve, and relieve the symptoms of kidney disorders, or to help in the case of mild constipation. During World War II, the British government used collected rose hips to make rose hip syrup as a source of vitamin C to replace citrus fruits that were impossible to get. Rose hips have a long history of use in traditional medicine.