Purium's cereal grass powders are composed of plant matter dried at 88°F to a moisture content of <7%. This results in a product that is shelf-stable, but which has not lost nutritional content. If we used a higher heat, we would risk damaging the important compounds in plants that make them nutritious.
Certain drying processes help remove water and/or moisture, leaving only the dry material. The details of this process are proprietary but the basic mechanics can include the use of vacuum hot air chambers, revolving heated drums and negative pressure.
When products are dissolved in water or juice as recommended, the plant matter is briefly brought back to the state of vivacity just prior to the drying process. We recommend consuming green drinks within half an hour of mixing.