Saco Powdered Buttermilk is the only product of its kind available on the retail market today. Made from sweet cream, churned buttermilk, which is the by-product of butter making, SACO Buttermilk Blend is the first real buttermilk available to consumers in over 50 years. Fluid buttermilk, found in today"s dairy case, is merely cultured skim milk and contains no real buttermilk.