Operational since 1911, Challenge Dairy Products Inc. is a cooperative association into marketing and distribution of dairy products. Based in California, the company s product Challenge Butter is one the largest selling brand in the West. Some of its other products include various categories of butter, such as unsalted, whipped, unsalted whipped and Danish Creamery Butter. In addition, the firm distributes over 1,000 other items, such as eggs, salad dressings, margarine, oils, pickles, desserts and stock base. Challenge Dairy Products Inc. has associations with various organizations, including American Butter Institute and Dairy Management Inc.