Glacial Rock Dust contains a broad range of trace minerals, many of which have been slowly lost through the ages on commercial farmland, by erosion, leaching and farming practices. Glacial Rock Dust is a natural mineral product which is produced over many thousands of years by glacial action. Both plants and animals, including humans, benefit from a regular supply of the trace minerals present in Glacial Rock Dust, which are best transferred to the human body through foods grown in soil rich in trace minerals.