According to the data of Public Health Network, most of the yogurt powder frozen for three years has passed the shelf life, and the bacteria in it gradually declined after freezing. After using fermented yogurt again, it may have an impact on health, and the improvement effect cannot be achieved, so it cannot be used.

Yogurt milk powder is a kind of food starter, and its main components are Streptococcus thermophilus and Lactobacillus delbrueckii subspecies. Bulgaria. As long as we master the correct method and use high-quality yogurt starter, homemade yogurt can rival any yogurt sold in the market and bring more benefits to our health.