Sourced from seawater, this natural marine Magnesium contains no Magnesium oxide, giving it superior absorption as well as being gentle on the digestive tract. GO Magnesium 1-A-Day is a great way of ensuring you get your recommended daily intake of this vital mineral to help keep operating at your best. GO MAGNESIUM 1-A-DAY is a high strength, 1-A-Day formula which contains 500mg of elemental Magnesium per capsule. Magnesium is effective in supporting relaxation, soothing muscle tension and muscle tightness as well as for supporting a good nights sleep. 1-A-Day dose per capsule 500mg of natural Magnesium Supports relaxation, soothing muscle tension and tightness A gentle, high absorption, oxide free Magnesium. Magnesium is one of the most important nutrients as it is involved with hundreds of processes within the body but is easily depleted when the body is under stress from things such as exercise, stressful situations, poor diet and alcohol or just from having a modern busy lifestyle.