Elderberries are edible when cooked. Elder leaves contain the flavonoids rutin and quercertin, alkaloids, vitamin C and sambunigrin, a cyanogenic glucoside. Fresh elder leaves also contain hydrocyanic acid, cane sugar, invertin, betulin, free fatty acids, and a considerable quantity of potassium nitrate. Elder flowers and elder flower water have been used in a variety of ways topically and as a tonic mixture. Elder flowers are a mild astringent and are used in skin washes to refine the complexion and help relieve eczema, acne and psoriasis.
Flower water makes a soothing gargle and when strained makes an excellent eye wash.
The leaves and flowers are a common ingredient in ointments and poultices for burns and scalds, swelling, cuts and scrapes. Infusions and preparations with the blossoms combined with other herbs have also been used to quicken recovery form the common cold and flu. Topically for infections, inflammations and swelling. As a wash for skin healing and complexion purification. As a tea and cordial to sooth sore throats, speed recovery from cold and flu and relieve respiratory distress.