Guardian One Flea Monthly Prevention Capsules For Dogs 2-10lbs 13CT are expertly formulated with 11.4mg of Nitenpyram and 45mg of USP grade Lufenuron. These two powerful ingredients are carefully blended with premium meat in a compact clear gelcap, providing both fast-acting and long-lasting protection against fleas and their eggs. Nitenpyram begins working in just 30 minutes while Lufenuron offers 30 days of protection. Both of these ingredients are considered the gold standard in pet supply products and have been time-tested for their effectiveness and gentleness. Unlike other products, Guardian uses all-natural, restaurant-quality cuts of meat and no artificial flavors or preservatives. The airtight bottle cap and gelcap locking design ensure freshness and reduce air penetration, making these capsules an ideal choice for your dog's flea prevention needs.