Generally the intestinal lactobacilli most often mentioned as beneficial dietary adjuncts are Lactobacillus acidophilus and Lactobacillus bifidus . These organisms possess characteristics which would permit their survival and growth in the intestinal tract. They also produce antagonistic actions toward enteric pathogens. So, the consumption of fermented milk products containing L. acidophilus and L. bifidus bacteria provide some possible benefits to health and nutrition. These benefits will be examined under the general headings in this review.