Help your cat deal with the environmental stress of daily life with Purina Pro Plan Veterinary Supplements Calming Care Probiotics for Cats. This Purina Pro Plan cat food supplement contains a strain of beneficial probiotic bacteria known as BL999, shown to help cats maintain calm behavior when fed daily for up to six weeks. Feeding your cat this cat food supplement helps promote positive behaviors, such as playing and seeking out social contact and supports their ability to adjust to changes in routine, location and other events that may cause your cat stress. Adding this supplement to your cat’s diet is safe, calming for cats and helps to blunt the production of the stress hormone cortisol. Each packet of this probiotics powder contains a guaranteed level of microorganisms to help your cat stay calm. The science behind our products represents a collaboration among Purina nutritionists, researchers and veterinarians.