I am giving a rating of "poor" due to Evivo's customer service and return policy (or lack thereof), and not necessarily the product itself. I used Evivo with my infant for approximately 3 days in which he did not have a bowel movement (and not until 2 days after stopping the probiotic). I am working with his healthcare provider through a program where it is essential he eliminates at least once a day due to a recent diagnosis he received. When I spoke to the customer service agent and relayed this info, he told me it was "completely normal" and not to worry. I am well aware that an infant not having a bowel movement for several days (even up to 10) can fall in the range of "normal," but I thought it seemed reckless at best for a non-medical professional with no knowledge of my son's health history to assure me that everything was fine. I was simply looking to recoup some of the money I spent and donate the probiotics to a family in need, but as the customer service representative said at the end of our conversation, "it's a like ordering a pizza, you can't return it." Evivo has BRILLIANT marketing, but it's disappointing to me that they target parents who are desperate to heal whatever is ailing their child, and at a price that cannot be justified.