Bayer Corporation serves as the US headquarters of German pharmaceuticals and materials giant Bayer AG. It oversees US operations across the parent's four reporting areas of Pharmaceuticals (medications for cardiovascular disease, pulmonary hypertension, and multiple sclerosis, among other issues), Consumer Health (OTC medications, nutritional supplements), Crop Science (seeds, herbicides, fungicides, and insecticides), and Animal Health (treatments for companion animals and livestock). Leading products in the US include blood thinner Xarelto, over-the-counter allergy medicine Claritin, and Advantage flea, tick, and worm control products for animals.