The most common side effects of magnesium are diarrhea or loose stools and interactions with medications. Overdosing may also lead to muscle weakness, irregular heartbeat, low blood pressure, and breathing difficulties. Ensure proper dosage and choose the right type of magnesium supplement based on your needs.
Stomach Issues and Diarrhea
Magnesium can affect the gastrointestinal tract, and certain forms of magnesium are more likely to cause issues. Common symptoms include loose stools. Magnesium oxide is more prone to having a laxative effect, whereas other forms, such as magnesium glycinate, typically do not have these effects. We do not use magnesium oxide in our magnesium products due to its low bioavailability and its tendency to cause severe loose stools.
Interactions with Medications
Magnesium can interact with certain medications, affecting their efficacy. Magnesium should not be taken at the same time as, for example, antibiotics. The same applies to calcium channel blockers, which should not be taken concurrently with magnesium supplements. Wait at least 2–3 hours between doses.
Symptoms of Overdosing
In the case of a magnesium overdose, the following symptoms may appear: muscle weakness, irregular heartbeat, low blood pressure, and breathing difficulties.
How to Avoid Magnesium Side Effects
Read our advice on how to minimize the risk of side effects when taking magnesium supplements.
The Right Type of Magnesium Supplement
There are different forms of magnesium, and some are less likely to cause side effects. Magnesium citrate, magnesium malate, magnesium taurate, and magnesium bisglycinate generally do not cause side effects such as loose stools when taken at the recommended daily dose. Magnesium oxide almost always causes side effects and is not a form we recommend. It is best to choose forms that are more bioavailable and have fewer gastrointestinal effects. It’s important to always purchase high-quality supplements. This applies not only to magnesium but to all types of supplements.
Dosage and Timing
To minimize the risk of side effects, it is important to follow dosage guidelines. Start with a low dose and gradually increase if needed. It’s also a good idea to take magnesium supplements with food to reduce the risk of stomach discomfort. Avoid taking large doses at once; instead, spread the intake throughout the day. Do not take magnesium at the same time as medications with which it interacts.
At-Risk Groups
Certain groups, such as the elderly, children, and pregnant individuals, should be extra careful to always follow the recommended dosage. Older adults may have reduced kidney function and should therefore be especially mindful of their dosage.
Frequently Asked Questions About Magnesium and Its Side Effects
Can Magnesium Cause Allergic Reactions?
Allergic reactions to magnesium are rare but can occur. Symptoms may include rashes and itching. If you experience these symptoms, stop taking the supplement immediately and consult a doctor.
How Quickly Can Side Effects Appear After Intake?
Side effects, particularly gastrointestinal symptoms such as diarrhea, can appear within a few hours after intake. If discomfort occurs, adjust the dosage or switch to a different form of magnesium. As mentioned, we do not sell magnesium oxide, which is the form most likely to cause loose stools.
Is It Safe to Take Magnesium Supplements Daily?
For the vast majority of people, it is completely safe to take magnesium supplements daily within the recommended doses. If you want to learn more about magnesium, you can read more here.
