Magnesium is a mineral needed for health that helps turn the food we eat into energy and helps make sure the parathyroid glands, which produce hormones important for bone health, work normally.
You should be able to get all the magnesium you need from your daily diet. Some researchers and doctors believe that a low level magnesium deficiency may contribute to the symptoms of Fibro. A low level magnesium deficiency cannot be easily tested for in a blood test, so ruling this out can be difficult.
There is a very small amount of evidence for using magnesium to treat Fibro and overall the evidence is conflicting26, but it is a common supplement suggested by doctors specialising in Fibro.
It is worth noting that some forms of magnesium are more easily absorbed than others (magnesium malate or chelated magnesium are often suggested) and the less easily absorbed forms of magnesium may act as laxatives.
Taking high doses of magnesium for a short time can cause diarrhoea. If you take magnesium supplements, do not take too much because this could be harmful. However, having 400mg or less a day of magnesium from supplements is unlikely to cause any harm.
Taken from FibroAction a national UK