27 Jan 2017 --- Omya offers high purity natural calcium carbonates for fortification purposes. With its high content of bioavailable elemental calcium (approximately 40%), the Calcipur brand is one of the most concentrated and therefore efficient sources of calcium available. When producing plant-derived drinks based on soy, rice, oat, coconut or almond, the right particle size is critical to ensure stability and that sedimentation rates are as low as possible.