Elderberry (Sambucus nigra) is a Eurasian climate shrub, commonly growing in Poland. An elderberry flower (Sambuci Flos) and elderberry fruit (Fructus Sambuci nigri) are medicines and are eatable, rich in biologically active ingredients. Flowers are a source of routines (flavonoid), tannins, organic and phenolic acids and essential oil and 9% of minerals ; fruits contain anthocyanins, tannins, organic and phenolic acids, vitamin B and C, pectins, and sugars and trace amounts of essential oil. The flowers are diuretic and diaphoretic and increase the flexibility of capillaries. Fruits are detoxifying, allowing the elimination of harmful residues of metabolism outside the body. The juice from the elderberry fruit supports immunity.