Roots Organics Super Nitro Bat Guano is incredibly high in nitrogen and is extracted only from select caves when the quality is at its highest. This potent and powerful high nitrogen guano is consciously extracted to not disturb the bat colonies, while still providing an unparalleled completely natural source of nitrogen. Super Nitro Bat Guano is fast acting and is so powerful it should be used carefully and sparingly. 100% naturally occurring bat guano. No additives. No filler.