Dec272025
A glass of water and a square piece of paper reading ‘Mg Magnesium’ beside a hand holding several small pills, all on a light blue background.

Can anyone take magnesium supplements?

Magnesium supplements are widely used to support overall health, including muscle function, bone strength and energy metabolism. However, not everyone can safely take them. 

Each person’s health situation is unique, and what works for one individual may not be suitable for another. Understanding the factors that influence whether you can take magnesium safely is essential before starting supplementation.

Who should not take magnesium supplements?

Getting magnesium from your diet is usually safe, and taking magnesium supplements is also generally safe if you follow the recommended dosage instructions. However, there are some people who should get medical advice before starting magnesium supplements, and even some who should avoid them altogether.. 

For example, people with kidney diseases can have difficulty excreting excess magnesium through their kidneys, increasing the risk of it building up within the body and causing toxicity. Those with heart issues or arrhythmias should consult their doctor before taking supplements, because high levels of magnesium may alter the rhythm of the heart.

Magnesium may also interact with other medications, such as antibiotics and medicines designed to lower blood pressure. In addition, if you’re about to have a blood test or another medical procedure, it’s best to let your doctor know you’re taking magnesium, as it could affect test results.² 

Not sure whether there are any reasons why you personally should avoid magnesium supplements? Speak to a doctor or pharmacist about your medical history for tailored advice. 

Are magnesium supplements safe in pregnancy?

Magnesium is essential during pregnancy, contributing to muscle and nerve function and.³ Many prenatal vitamins include magnesium, and it is generally safe when taken within recommended amounts.

However, high doses of magnesium from supplements can sometimes cause adverse effects, including diarrhea or abdominal discomfort. Pregnant women should always follow medical guidance to determine the appropriate dosage. Excess magnesium, particularly from non-food sources, may not be the best choice without oversight from your doctor or midwife.⁴

Are magnesium supplements safe while breastfeeding?

Magnesium is generally considered safe during breastfeeding.⁵ Adequate magnesium supports the mother’s energy levels. Most supplements taken within recommended limits do not pose a risk to the baby.

It is important to avoid extremely high doses, as excessive magnesium may lead to gastrointestinal discomfort for the mother and, in rare cases, may affect the infant. Consulting a doctor or midwife can help ensure safe supplementation tailored to your individual needs.

Can magnesium supplements interact with existing health conditions?

Magnesium interacts with various health conditions, and caution is needed in certain scenarios. For example, people with kidney disease or severe heart conditions may be more vulnerable to magnesium building up in the body.¹ Similarly, individuals with digestive disorders that affect nutrient absorption may require adjusted doses.

Healthcare providers can help determine safe dosages based on personal medical history, current medications and dietary intake. This individualised approach ensures that magnesium supplementation supports health without causing unintended side effects.

Can magnesium supplements affect blood tests?

Magnesium supplements can sometimes interfere with laboratory tests. High magnesium levels may alter results related to kidney function, calcium levels or electrolyte balance.² Patients planning routine blood tests should inform their healthcare provider if they are taking magnesium supplements. 

In most cases, standard doses do not significantly affect results, but letting your healthcare team know can help them to interpret the results more clearly. It also gives them the chance to let you know if it’s necessary for you to stop taking magnesium supplements temporarily.

Final thoughts

Magnesium supplements offer important benefits, supporting muscle and nerve function, bone health and overall energy metabolism. They can be particularly useful for people who don’t get enough magnesium through their diet, or for those who have health conditions affecting their ability to absorb nutrients. 

However, supplements are not suitable for everyone. People with kidney disease, heart conditions or those taking certain medications should consult a healthcare professional before starting magnesium supplementation.

Pregnant and breastfeeding women can usually take magnesium safely within recommended limits, but medical guidance is advised to avoid excessive intake. It’s also important to consider potential interactions with blood tests or existing health conditions – a doctor or pharmacist can help you to understand the risks based on your medical history. 

By understanding these factors and taking magnesium responsibly, most individuals can safely incorporate it into their wellness routine. For more information, Nutraxin offers Magnesium Complex and a detailed guide on magnesium sources and importance.

References 

  1. National Institutes of Health. (2023). Magnesium: Fact Sheet for Consumers. https://ods.od.nih.gov/factsheets/Magnesium-Consumer/
  2. Mayo Clinic. (n.d.). Magnesium: Dosage, Side Effects, and Safety. https://www.mayoclinic.org/drugs-supplements-magnesium/art-20363056
  3. American Pregnancy Association. (2022). Magnesium During Pregnancy. https://americanpregnancy.org/healthy-pregnancy/pregnancy-health-wellness/magnesium-during-pregnancy/
  4. Healthline. (n.d.). Is Magnesium Safe During Pregnancy? https://www.healthline.com/nutrition/magnesium-during-pregnancy
  5. Breastfeeding Network. (n.d.). Minerals and Supplements While Breastfeeding. https://www.breastfeedingnetwork.org.uk/advice/minerals-supplements/