Chemical Composition: Silicic acid (5 - 7.7%), Flavonoids (apigenin, genkwanin, kempferol, luteolin, quercetin), caffeic acid esters (chlorogenic acid, dicaffeoyl-meso-tartaric acid), alkaloids (nicotine, palustrin), minerals (silicon, selenium, magnesium, calcium, manganese, phosphorus, potassium, zinc, chrome, cobalt)