Abstract: Powdered acidophil fermented milk products that can be readily reconstituted are prepared by spray drying milk which has been fermented with acidophil bacteria to produce a powdered product, agglomerating the powdered product, lyophilizing a culture of acidophil bacteria under specific conditions to insure maximum survival of the bacteria to produce a foamy dried mass containing live acidophil bacteria, grinding the foamy dried mass and mixing the resultant ground powdered product with the agglomerated powdered product to produce a powdered acidophil milk product that can be readily reconstituted to produce an acidophil milk containing about 200 million acidophil bacteria per cc.