Vets#1 Calming Chew: As the only calming chews clinically proven to work within 30 minutes and last up to 4 hours, Composure dog calming chews are the preferred choice in veterinary clinics across the country* | Our clinically proven formula: Contains our Colostrum Calming Complex, l-theanine and thiamine (vitamin B1) to help alleviate stress-related behavioral issues and keep your dog relaxed without affecting their personality or energy level | Not a sedative: Our great-tasting peanut-butter-flavored dog supplement is safe to administer for long term daily use or for specific situations and it is safe to double or triple the dose in times of added stress | Safe, high-quality ingredients: Our dog and cat supplements are certified by the National Animal Supplement Council (NASC), routinely undergo third-party testing and contain no hidden ingredients, artificial flavors, synthetic colors or preservatives | Veterinarian-formulated and approved: Formulated with the expertise of scientists and veterinarians, and trusted by over 15,000 veterinary clinics in the U.S., VetriScience only makes supplements that vets feel confident giving to their own pets