Live Culture Frozen Yogurt Standards
The National Yogurt Association (NYA) guidelines stipulate that frozen yogurt that carries its seal stating "Live & Active Cultures" has to be made from fermented and pasteurized milk that contains conventional yogurt cultures to create proper levels of acidity.
Freezing Effects on Cultures
Freezing yogurt merely throws the cultures into a dormant, inactive state that ends when the yogurt is warmed through consumption. After being eaten, it has the same benefits as refrigerated yogurt.
Some products marketed as frozen yogurt are imposters. These mixtures are frequently unfermented or contain yogurt that has been heated, which kills the active cultures. To be sure frozen yogurt is authentic, be sure it has the NYA seal on the package.