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 therapeutic products represents a collaboration among Purina nutritionists, researchers and veterinarians. Number 1 veterinarian-recommended cat probiotic brand to support calm behavior (Kantar Veterinary Tracker, 2021), making it an excellent cat supplement Cat calming products with a proprietary use of probiotic strain BL999 to help cats maintain calm behavior Probiotics powder has shown improvement in cats displaying anxious behaviors such as pacing Supports cats ability to cope with changes in routine and location, relieves cat stress and supports positive behaviors such as playing and seeking out social contact Supports cats ability to cope with changes in routine and location It helps blunt cortisol, a marker of stress, to keep your cat calm while also supporting a healthy immune system