Expertly crafted for small dogs weighing 2-10lbs, Guardian One Capsules pack 11.4mg of Nitenpyram and 45mg of USP grade Lufenuron in a single clear gelcap. In just 30 minutes, Nitenpyram begins its fast-acting flea prevention, while Lufenuron provides a month-long safeguard. Both ingredients are renowned in the pet supply industry for being gentle yet effective. There are no preservatives or artificial flavors in our all-natural gelcaps, made with high-quality meat. Guardian products are expertly preserved with oak or hickory-fired smoke and can last indefinitely in the fridge or up to 2 years at room temperature, thanks to our airtight bottle cap and gelcaps locking design.