Frass is a natural by-product of the larvae production operation and is made up of insect castings and exuviae. It is rich in nutrients, Chitin and organic matter that produce tasty and nutritious crop. MagProtein’s NatSoil and Natural Garden Frass are made from BSF larvae frass. Our larvae are fed a strict diet that optimizes the nutrient profile of the finished product. They are reared in climate controlled conditions to ensure stability and consistency. Frass is separated using a mechanical process and heat treated to kill any pathogens.