I have the results of my tests, and I'm 99.9% convinced that the package contains viable LAB and is not simply a flavoring. This morning, there was no activity in the control, a modest amount of activity in the LAB only, and significant activity in the as-packaged. By this evening, there was still next to no activity in the control, however there was significant activity in the LAB-only, and the as-packaged had peaked and was starting to fall. As far as flavor, there was no detectable sourness in the control while the other two were similar with a noticeable, but not particularly strong, sourness. Keep in mind that I only use 0.2% in each of the two test batches.