Sheep pellets with 20% humate blended in with them, making them easier and quicker to break down and have the carbon available to feed the microbes. Basically, you are getting all the goodies of the sheep manure plus the humate! Another great benefit of Growth Booster is that the carbon in the humate soaks up the lanolin smell of the sheep manure, eliminating the majority of the odour and making it a lot more pleasant to apply.