In order to study the effects of commercial fermented milk and Lactobacillus juice on the growth and on blood composition of albino rats, these beverages were administered orally everyday and compared with the control rats. Experimental rats gained weight significantly compare with the control rats within the first week, but the body weights were comparable with the control during the next three weeks. WBC count was increased slightly in the experimental groups, but RBC count, hemoglobin and total serum protein contents were almost the same as that of the control group during the period. Fermented milk was effective in food efficiency ratio and fermented milk and lactobacillus juice were not influenced on any of internal organs weight.