Horsetail contains alkaloids, vitamin C, carotene, organic acids, macro- and microelements: potassium, calcium, magnesium, iron Contained alkaloids vitamin C carotene organic acids macro- and microelements: potassium, calcium, magnesium, iron, manganese, copper, zinc, molybdenum, selenium, aluminum, nickel, boron, iodine silicic acid compounds (in rare soluble form) Our information The main stem of the plant is smooth, ribbed, dark green, divided into segments.