DCU means “Direct Culture Unit”. As each batch can have different activity, the filling in Germany is geared to that, so that each package always does the same amount of milk. The higher the active the smaller the package (Lower weight).

But you don’t have to be right on. We do not deal in teaspoons but grams. But you are welcome to convert to teaspoons. LYO = "lyophilized" mean the starter culture is freezed dried and can be shipped withour refrigeration.