Stinging nettle leaves and stems contain flavonoids, organic acids including formic and acetic acids, beta-carotene, vitamins A, B, B5, C, K, mineral salts - especially iron, calcium, potassium, phosphorus and magnesium, chlorophyll, acetylcholine, tannins, beta-sitosterol, enzymes, silicon and calcium compounds, acids: linoleic, linolenic, stearic, palmitic and oleic, almost all known amino acids.