Maximum Magnesium Per Day: How Much is Too Much?

Maximum Magnesium Per Day: How Much is Too Much?

Understanding the maximum magnesium dosage per day to ensure you reap its benefits without experiencing adverse side effects.

Magnesium, an essential mineral, plays a critical role in countless bodily functions, from muscle and nerve function to energy production(1). As magnesium gains popularity in the wellness world, it's essential to understand the appropriate dosage to avoid potential side effects. In this article, we'll explore the maximum daily dosage of magnesium and how to ensure you're getting the right amount.

How Much Magnesium Do You Need Daily?

The Recommended Dietary Allowance (RDA) for magnesium varies based on age, sex, and life stage(2). Here's a quick overview of the general RDAs for magnesium:

  • Males aged 19-30: 400 mg/day
  • Males aged 31 and older: 420 mg/day
  • Females aged 19-30: 310 mg/day
  • Females aged 31 and older: 320 mg/day
  • Pregnant women: 350-360 mg/day
  • Lactating women: 310-320 mg/day(2)

These amounts represent the average daily intake required to meet the nutritional needs of most healthy individuals(2).

What is the Upper Limit for Magnesium?

The Tolerable Upper Intake Level (UL) is the highest daily intake of a nutrient unlikely to cause adverse health effects for most people(3). For magnesium, the UL from supplements and medications (not from food) is as follows:

  • Ages 9-18: 350 mg/day
  • Ages 19 and older: 350 mg/day
  • Pregnant and lactating women: 350 mg/day(3)

It's important to note that the UL only applies to magnesium obtained from supplements and medications, as magnesium from food sources has not been associated with any adverse effects(3).

Can You Take Too Much Magnesium?

While magnesium is essential for overall health, consuming too much can lead to side effects, especially if you're exceeding the UL(4). Some of the potential side effects of excessive magnesium intake include diarrhea, nausea, abdominal, cramping, lethargy, irregular heartbeat, low blood pressure and respiratory distress(4).

In severe cases, extremely high levels of magnesium can lead to a condition called hypermagnesemia, which may result in cardiac arrest and death(5). However, such cases are rare and typically only occur in individuals with kidney issues or those taking extremely high doses of magnesium supplements(5).

How to Determine the Right Magnesium Dosage for You?

Determining the right magnesium dosage is crucial for maximizing its benefits while avoiding potential side effects. To do this, consider the following factors:

  • Assess your dietary intake: Track your daily food intake to estimate your magnesium consumption from food sources. Foods rich in magnesium include nuts, seeds, legumes, whole grains, and leafy green vegetables(6).
  • Consult a healthcare professional: Speak with a healthcare provider or registered dietitian to assess your magnesium needs and determine if supplementation is necessary.
  • Choose the right form: Magnesium supplements come in various forms, such as magnesium citrate, magnesium glycinate, and magnesium oxide(7). Each form has different absorption rates and potential side effects. Consult with a professional to determine the best form for your needs.
  • Start low and go slow: Begin with a lower dosage of magnesium and gradually increase as needed, closely monitoring for any side effects.
  • Monitor your response: Pay attention to how your body responds to magnesium supplementation, and adjust your dosage accordingly.

Can Combining Different Magnesium Forms be Beneficial?

Combining different forms of magnesium may provide a more comprehensive approach to meeting your magnesium needs. For example, magnesium citrate and magnesium glycinate are both highly bioavailable forms, offering different benefits(7). Magnesium citrate is known for its gentle laxative effect, while magnesium glycinate is better for those who are sensitive to the laxative effect or require better absorption without gastrointestinal side effects(7). Mixing these forms in the right proportions may help you achieve your desired benefits without discomfort.

It's essential to understand the appropriate daily magnesium intake to maximize its benefits and avoid potential side effects. The RDAs for magnesium vary depending on age, sex, and life stage, and it's crucial to consider the UL when using supplements or medications. Consider combining different magnesium forms to achieve the desired effects without adverse reactions. Remember, it's always best to start with a lower dosage and gradually increase as needed, while closely monitoring your body's response.


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(1) National Institutes of Health. "Magnesium: Fact Sheet for Health Professionals." Office of Dietary Supplements,

(2) Ibid.

(3) Ibid.

(4) Guerrera, Mary P., et al. "Therapeutic uses of magnesium." American Family Physician 80, no. 2 (2009): 157-162,

(5) Jahnen-Dechent, Willi, and Markus Ketteler. "Magnesium basics." Clinical Kidney Journal 5, no. 1 (2012): i3-i14,

(6) National Institutes of Health. "Magnesium: Fact Sheet for Health Professionals." Office of Dietary Supplements,

(7) Grober, Uwe, et al. "Magnesium in prevention and therapy." Nutrients 7, no. 9 (2015): 8199-8226,

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