The Magnesium Oxide contained in Oxy-Purge is derived from ancient oceanic deposits and is a rich source of elemental magnesium Oxide in the human body at certain levels supports the naturally occurring relaxation of the bowels, which allows for intestinal impurities to be excreted. Manufacturer is cGMP NSF Certified, Organic Certified by ECOCERT and FDA Registered. Product is Made in the USA. Suggested Usage: Start by taking 4 capsules with an 8 oz. glass of water at bed time. Magnesium Oxide capsule dosage can be adjusted to achieve desired results.