Yogurts supplemented with PE or SA had greater buffering ability, and maintained greater L. bulgaricus and L. acidophilus counts by the end of the storage compared with NS yogurts. Therefore, yogurt mixes demonstrating greater buffering capacity can enhance the longevity of Lactobacillus bacteria in yogurt; hence, increase the shelf life of probiotic yogurt (defined as viable culture concentrations ≥6 log cfu/g). However, no significant effects of greater buffering ability of yogurt mixes were observed for S. thermophilus and B. animalis. Further research should be done to study the effect of PE supplementation on the sensory attributes of the yogurt.