I am not too keen on paying $46 for one month's supply of probiotics for one person. However, I do not mind paying $46 + milk for an endless supply of probiotics for two people. Not only can you TEST your probiotics by following yogurt-making steps,* but you can keep producing beneficial gut bacteria which can save you a small fortune. I used two capsules of BioGaia Osfortis, Women’s** Probiotic for Strong Bones, Immune Balance & GI Wellness, Contains L. reuteri 6475 to make a quart. It was thinner than I liked when I checked it the first time, so I put it back in the cooler for another 12 hours. Today, I will start more using a couple of tablespoons from the jar to make the next batch.
*I've used the cooler method for making yogurt for over 20 years (maybe 30). It's never failed.
**It is beneficial for men too.