Magnesium supplements—are they safe and what dosage should you take?

Magnesium is crucial for a healthy body, and comes from the food we eat and any supplements we take.

If you’re not sure whether taking supplements is safe for you, or you want to know the right dose and any possible side effects, read on for more information.

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Is magnesium safe?

Yes. In fact, it’s one of seven main minerals that our bodies need in fairly large amounts to be able to function properly. Without it, we might develop a magnesium deficiency.

Taking magnesium supplements is safe providing you don’t go too far over the recommended dose for your age. These recommended doses are set out below.

If you have a medical condition, it’s always worth checking with your doctor that it’s safe to begin taking magnesium supplements.

Is it safe to take every day?

Yes, as long as you keep to the recommended daily dose, which is set by the Government’s Department of Health.

Adult men are advised to take no more than 300 mg each day, while adult women shouldn't exceed 270 mg (unless they are pregnant, when the recommended dose increases to 400 mg). For children, the dosages are much lower.

See What dosage of magnesium should I take? to read more about recommended daily dosages for adults and children.

It’s worth mentioning that these dosages are only for supplements taken orally (e.g. tablets). Transdermal magnesium supplements—those you apply directly to your skin, like many of BetterYou’s magnesium supplements—have no upper limit.

Read more about transdermal magnesium here.

Is it safe to take when pregnant?

Yes. There’s no scientific evidence to point to any risks associated with taking magnesium supplements during pregnancy, or later when breastfeeding.

In fact, the recommended daily dosage for pregnant women increases from 375 mg to 400 mg for supplements taken by mouth. Again, with transdermal magnesium supplements, there is no maximum dose.

Is it possible to take too much magnesium?

At present, there’s little clinical evidence to show that taking high doses of magnesium over a long period of time can be harmful.

There’s a chance that taking extremely high doses of magnesium could have some harmful side effects. But as long as you stick to 400 mg or less a day from supplements, you shouldn’t have any problems. Taking more than this isn’t recommended unless you’re under medical supervision.

If you’re healthy, you’re unlikely to take in a surplus of magnesium from food as your kidneys get rid of any excess amount in your urine1.

What are the side effects of taking magnesium?

Can it cause joint pain or muscle pain?

Magnesium is a natural muscle relaxant so shouldn’t cause you any pain. There have been cases of people feeling pain or stiffness in their joints or muscles while taking magnesium, but these are rare.

As muscle pain isn’t a common side effect of high magnesium intake, it might actually be that your intake is too low.

For most people, magnesium causes no pain and helps to strengthen bones and keep muscles functioning healthily.

Can it cause numbness, tingling or itchiness?

Taking oral magnesium supplements shouldn’t cause any numbness, tingling or itchiness in your skin. These feelings, in fact, could be a sign that you have a magnesium deficiency, particularly if they occur in your feet, hands or face.

A magnesium benefit is that it helps with your nervous system and nerve endings, and any deficiency in the mineral can cause nerve damage, which leads to that tingling or numb sensation.

Transdermal magnesium can cause a tingling or feeling of itchiness when first applied to the skin. However, this is usually a sign of low magnesium levels and will subside as levels increase.

Can it cause tiredness?

It shouldn’t. Taking magnesium is proven to improve sleep, and better sleep should leave you feeling more refreshed and energetic.

If you feel tired, this might actually suggest you aren’t getting enough magnesium—it’s very unlikely to be a consequence of the supplements themselves.

Can it cause diarrhea?

As magnesium is a natural muscle relaxant, taking large doses orally can have a laxative effect.

Transdermal magnesium doesn’t have the same effects as it absorbs through your skin rather than pass through your digestive system.



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How taking magnesium supplements can help poor sleep

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