Many frass suppliers provide no information to the nutritional and heavy metals analyses of their product, leaving no guarantees that their frass is free of pesticides, poisons, or other harmful toxins. We guarantee that our frass is 100% American Made in Sonoma County, California, and is fed purely pre-consumer waste from grocery stores, the same food we feed our families. Here is the nutritional and heavy metal analyses to ensure that our product is natural and high quality.