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. Potent and powerful high nitrogen guano consciously extracted to not disturb the bat colonies but provide 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.