Two of the largest health care services companies in the country, CVS Caremark (CVS -0.42%) and UnitedHealth (UNH 0.44%), are pursuing growth opportunities in one of the largest developing markets in the world: Brazil. In this video, Motley Fool health care bureau chief Brenton Flynn tells investors about some of the domestic headwinds, such as drugstore market saturation in the U.S., that make this rush for Brazilian real worthwhile.