Since 1925. See nutrition facts for sodium content. Grade A. Questions or comments? Call 1-800-395-7004. The Purity Guarantee: All products bearing the Purity Dairies name are unconditionally guaranteed for quality from the date of purchase until consumed - or your money back. That's always been our guaranteed. We just wanted to remind you. www.puritydairies.com. Thanks, Purity lover!