For when you can't "bayer" the pain, Bayer Corporation makes your medicine. The US subsidiary of pharmaceuticals and materials giant Bayer AG (or Bayer Group), the company operates through three divisions and an internal services company. Bayer Corporation handles Bayer Group's US operations in three segments: Bayer HealthCare (pharmaceuticals, animal health, and over-the-counter medicines), MaterialScience (plastics, coatings, and polyurethanes), and Bayer CropScience (herbicides, fungicides, and insecticides). The internal services unit, Bayer Corporate and Business Services, handles administrative, technology, human resources, legal, and procurement functions for the Bayer Group's US operations.