Good Health Magnesium Easy-to-swallow is a small sized capsule with marine magnesium, a highly bioavailable form of natural magnesium. This is an everyday low strength magnesium which is easy on digestion and therefore less likely to cause tummy upsets. 150mg elemental magnesium per capsule is a good maintenance dose for nerve, muscle and sleep support. Magnesium Easy-to-swallow is a marine sourced magnesium derived from seawater that also contains 72 additional trace minerals.