Since 1925. Our farmers pledge no artificial growth hormones (No significant difference has been shown in milk from cows treated with the artificial growth hormone rBST and non rBST treated cows). Backed by our five point purity promise. www.dairypure.com. Comments? 1-800-395-7004. Grade A. Pasteurized. Homogenized. As your trusted dairy, we're passionate about providing quality dairy products. That's why we hold our buttermilk to the highest standard. Our farmers pledge to never use artificial growth hormones, just like we promise to always deliver quality dairy products from farm to fridge. Enjoy our buttermilk in your favorite recipes and try all of our DairyPure products.