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Magnesium in pregnancy – What are the consequences of a deficiency?

14.04.2025

4 min. Reading time

Many expectant mothers wonder if they should supplement magnesium during pregnancy. It is important to know that a deficiency in this mineral can lead to a number of disorders. It is dangerous for both the pregnant woman and her child. Check how much magnesium the body of a pregnant woman needs.

Magnesium is one of the most important minerals for the human body. This substance is involved in the processes within the cells, protein synthesis, fats, and carbohydrates. It is very important for the nervous system. Thanks to it, nerve impulses are transmitted correctly, and the electrolyte balance remains at an optimal level. It is also important for DNA. Magnesium during pregnancy has a significant impact on the development of the child.

Can magnesium be taken during pregnancy?

Magnesium can be taken during pregnancy. Additional supplementation is recommended to avoid dangerous deficiencies. The expectant mother should be aware that the need for all nutrients, vitamins, and minerals increases during pregnancy. This happens because some of these nutrients are used by the child. Magnesium during pregnancy should primarily be obtained through food. However, due to various reasons, diet is often not a sufficient source, which is why the pregnant woman can take additional supplements that contain this mineral.

What are the symptoms of magnesium deficiency during pregnancy?

An insufficient magnesium level during pregnancy leads to the body not functioning properly and the child not developing correctly. A deficiency increases the risk of bleeding from the genital tract and, in extreme cases, even miscarriage or premature birth. It can also affect the development of the child’s nervous system and skeleton, as well as its birth weight. Magnesium deficiency during pregnancy can be suspected if the following symptoms occur:

  • Concentration and memory problems
  • Mood swings
  • Deterioration in the condition of hair and nails
  • Muscle tremors
  • Tingling and other uncomfortable sensations in the legs
  • Headaches
  • Sleep disturbances
  • Irregular heart rate

Magnesium deficiency during pregnancy can be confirmed through laboratory tests. A small blood sample is taken. A referral is made by the general practitioner or obstetrician.

Magnesium requirements during pregnancy

The magnesium requirement during pregnancy is higher than for women who are not pregnant. It is 360 mg per day (data from the Institute for Food and Nutrition). Supplementation should also continue after childbirth. The body of mothers who are breastfeeding requires 320 mg of magnesium daily.

Which magnesium should be taken during pregnancy?

It is important which type of magnesium is taken during pregnancy. One should choose supplements of good quality. Their composition should not contain preservatives or fillers. The rule of thumb is that the shorter the composition, the better. The dosage is also important. 2-3 capsules per day should cover the body’s needs. Magnesium for pregnant women is often part of combination supplements (e.g., also with folic acid or other vitamins and minerals). This way, the expectant mother can reduce the number of tablets she needs to take.

How should magnesium be taken during pregnancy?

Magnesium during pregnancy should be taken according to the manufacturer’s recommendations and the doctor’s advice. Before use, it is necessary to read the package insert. The supplement should be avoided if there are any contraindications.

Natural sources of magnesium

The expectant mother should also include foods in her diet that are valuable sources of magnesium. It is good to eat more of:

  • Nuts and seeds (e.g., pumpkin seeds)
  • Almonds
  • Legumes
  • Avocados
  • Whole grain rice
  • Bananas
  • Leafy greens (e.g., arugula, kale, chard, spinach)
  • Sprouts
  • Whole grain products
  • Cereal groats (e.g., buckwheat)

It is also important to ensure adequate fluid intake (at least 2.5 liters of water per day). It is good to choose mineral water with a high magnesium content.

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