"I often make soy milk yogurt from a culture or store-bought cow's milk yogurt, with which the results have been always great! Since my friends have told me that they sometimes use probiotic capsules for making yogurt, I gave it a try and chose this product. However, the result was totally unsatisfactory! Nothing was changed even after more than 12 hours in a warmer I have used for making yogurt. My soy milk neither coagulates nor develops yogurt flavor. I have never failed in making yogurt up until this point, so I just doubt whether this product really contains active probiotics."