OstroVit Field Horsetail Extract is a natural dietary supplement in the form of powdered extract from above-ground plant parts with 7% of silica. Although field horsetail is commonly known as a plant which supports restoration of hair and nails, its health-promoting properties are much broader. Silica included in the extract influences functions of kidneys, adrenal glands and heart. If you wish to enjoy beautiful hair, if you complain about slow-healing wounds and kidney infections, consider supplementing the field horsetail extract.