The objective of this study was to investigate if the adjustment of the buffering capacity of yogurt mix (by supplementing yogurt mix with PE) could increase the longevity of yogurt starter (S. thermophilus and Lactobacillus delbrueckii subsp. bulgaricus) and probiotic (Bifidobacterium animalis subsp. animalis and Lactobacillus acidophilus)bacteria, hence increase the shelf live of live-active culture probiotic nonfat yogurt, during 29 days of storage at 5°C.