Horizon Organic is the largest supplier of organic milk in North America. Its products are sold in supermarkets and grocery stores. Horizon produces organic milk on a 4,000-cow dairy in Idaho (2,400 milking cows) and an 800-cow dairy (475 milking cows) in Maryland. The company also purchases the majority of its organic milk (more than 90 percent) from more than 600 dairies in 22 states. Prior to being acquired by (now former parent company) Dean Foods, Horizon was a public company and owner of the organic dairy brands: Juniper Valley Farms, The Organic Cow of Vermont and United Kingdom brand Rachel's Organic. Horizon Organic's products are certified organic by the USDA and advertised as free of antibiotics, growth hormones and pesticides. In 2013, WhiteWave Foods (owner of the Horizon brand) became an independent company from Dean Foods.