Support an active lifestyle or strength or endurance training programme with this magnesium capsule from Swanson Health. Each capsule contains 200mg of magnesium to support energy metabolism, reduces tiredness and fatigue, as well as maintaining healthy muscles, bones and electrolyte balance. Support an active lifestyle or strength or endurance training programme with this magnesium capsule from Swanson Health. Each capsule contains 200mg of magnesium to support energy metabolism, reduces tiredness and fatigue, as well as maintaining healthy muscles, bones and electrolyte balance. 400mg of magnesium per serving. Supports energy metabolism and reduces fatigue. Maintain healthy muscles and healthy bones. Contributes to electrolyte balance. 250 capsules per pack Magnesium has a favourable influence on a normal energy-yielding metabolism and it is important for normal muscle function.