I was on magnesium supplements before I got pregnant. When I found out I was pregnant I swapped to a calcium/magnesium supplement. But it still has a high magnesium content (1000mg a day). Is there anything wrong with taking so much magnesium while I'm pregnant?

There is no conclusive evidence that taking magnesium or calcium supplements in pregnancy reduces the risk of pre-eclampsia, fetal growth restriction or preterm labour. This is unless of course you are deficient in either calcium or magnesium, and assuming you have a varied diet and don't have some form of malabsorption condition. It is very difficult to be deficient in these substances so supplementation is probably not useful; recommended daily intakes range from 250-400mg/day so 1000mg is a very large dose, unless used to treat serious conditions such as pre-eclampsia acutely. A recent Cochrane collaboration meta-analysis of all major trials of magnesium concluded: "There is not enough high quality evidence to show that dietary magnesium supplementation during pregnancy is beneficial."

I was on magnesium supplements before I got pregnant. When I found out I was pregnant I swapped to a calcium/magnesium supplement. But it still has a high magnesium content (1000mg a day). Is there anything wrong with taking so much magnesium while I'm pregnant?

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