Magnesium-rich foods: what the numbers actually show

What to expect in this article

1. What the body needs magnesium for
2. Why the DGE now gives only estimated values
3. How much magnesium per day
4. How well supplied Germany is
5. Three statements that persist
6. The foods at a glance
7. When a deficiency actually develops
8. What dietary supplements can contribute
9. Who may be at risk
10. Where you can place your values in context
11. Limitations: what a blood magnesium level tells you
12. What you can change starting tomorrow
Frequently asked questions
Sources

What the body needs magnesium for

Before looking at foods, it is worth considering where magnesium is actually found in the body. This distribution later explains almost everything that is difficult about this nutrient.

IQWiG states that most of the body's magnesium is found in tendons, teeth, and bones, with about two-thirds in the bones alone. Only 1 to 2 percent of total magnesium is found in the blood (as of March 20, 2025).

The DGE puts it even more precisely: The vast majority—99 percent of total body magnesium—is found inside cells, mainly in bones, muscles, and other soft tissue. Only 1 percent is found in extracellular fluid (as of September 10, 2025).

Why distribution matters so much

For most nutrients in this series, a function comes first. For magnesium, a distribution comes first—and there is a reason for that: It is why this nutrient is harder to measure than others.

A nutrient found 99 percent in cells and bones reveals little through a blood sample. The small amount circulating in the blood is also kept within a narrow range; according to the DGE, it does not decrease until after a prolonged period of inadequate intake lasting more than 80 days (as of September 10, 2025). Together, these factors lead to what Chapter 2 describes as the missing biomarker, and together they explain Chapter 11.

Why the DGE now only gives estimated values

In 2021, the DGE revised its reference values for magnesium, and something happened that almost never appears in advice articles: a recommended intake became an estimated value for an adequate intake.

The explanation gives two reasons. Because sufficiently reliable study data are lacking, the estimated values are derived from the population’s average magnesium intake. And: there is currently no suitable biomarker for determining magnesium status (DGE, 2021).

What an estimated value means

The difference sounds academic, but it is not. A recommended intake is derived from the measured requirement. Here, an estimated value is derived from what the population eats anyway.

This has a consequence worth keeping in mind: Anyone below the estimated value is below an average, not necessarily below their requirement. This distinction appears again in Chapter 4.

The DGE explicitly cites the difficulty of establishing a biomarker as being due to magnesium being predominantly intracellular, along with the complex interplay of absorption, mobilization from the bones, and excretion through the kidneys (as of September 10, 2025).

How much magnesium per day

The figures themselves are quickly explained and contain a surprise.

Estimated values for an adequate daily intake

Source: German Nutrition Society, Reference Values for Magnesium, basis for derivation: 2021

The surprise is on the third card

Following the 2021 revision, pregnant and breastfeeding women have the same estimated value as other women: 300 milligrams a day. No supplement, no separate value.

This contradicts much of what circulates on the subject. Anyone who reads in a text that magnesium requirements increase during pregnancy should check the date. The DGE notes that, due to insufficient data and inconsistent results, it is currently impossible to say whether a higher magnesium intake benefits pregnant women compared with non-pregnant women.

The value also remains the same for older people. The DGE explains this by stating that there is no clear evidence of an increased magnesium requirement in people aged 65 and over.

How well Germany is supplied

The data are based on the National Nutrition Survey II. According to it, average daily intake is 284 milligrams for women and 345 milligrams for men (DGE, as of September 10, 2025).

Both values are just below the respective estimated values of 300 and 350 milligrams. The difference is 16 and 5 milligrams, respectively, which is less than the amount found in half a serving of oatmeal.

The sentence that prevents the usual fallacy

For the same survey, the Verbraucherzentrale gives the following proportions: Approximately 30 percent of adult women and men did not meet the recommendations, compared with around 60 percent of adolescents and young adults (as of February 18, 2026).

And then comes the most important sentence in this chapter, one that appears in hardly any guide: However, this does not necessarily mean that these people have a deficiency (Verbraucherzentrale, 2026).

Together with Chapter 2, this gives a clear picture. Falling below an estimated value derived from the population average is not the same as having a deficiency. Chapter 7 explains how a deficiency actually develops.

How old these figures are

One point that is rarely mentioned in this context: According to the Max Rubner Institute, the National Nutrition Survey II was conducted from November 2005 to January 2007. The figures still used today to discuss magnesium intake in Germany therefore describe eating habits from around twenty years ago.

This does not invalidate them, because no more recent survey of this scope is available. But it puts them into perspective. Anyone reading that Germans have poor magnesium intake is reading a statement about a sample from the mid-2000s.

There is a second shift as well. The intake data date from that time, while the estimate against which they are measured was changed in 2021. The two figures belong to different points in time, and that should be stated.

Three statements that persist stubbornly

Widespread versus substantiated

The foods at a glance

Two preliminary notes distinguish this table from most others. First, the DGE values refer to portions, not 100 grams; no conversion is made here because the source does not provide one. Second, almonds, cashews, dark chocolate, and legumes are missing, although they appear on every popular list: None of the sources reviewed gives a numerical value for them.

Source: German Nutrition Society, Selected questions and answers about magnesium; sample days with nutritional data from DGExpert. All values refer to portions. The final column is this editorial team’s comparison with the estimated value of 300 mg and does not appear in the source.

This overview shows that there is no single standout food that covers an entire day’s needs. The table’s highest value, a serving of spinach, amounts to just under one third. Magnesium is a nutrient that adds up over the course of the day, not in a single meal.

The two types of seeds are equally striking. Twenty grams of sunflower seeds provide more than two slices of wholegrain bread, and 20 grams is a small handful. This is the row with the best effort-to-benefit ratio in the table.

Why the drinks count

The line for mineral water is usually forgotten when adding everything up, yet on this sample day it provides just as much as a banana. Mathematically, that corresponds to water containing 30 milligrams per litre. There is room to go higher: The consumer advice centre gives the threshold above which water may be labelled accordingly, and that is at least 50 milligrams of magnesium per litre (2026).

The DGE adds that espresso, fruit juices, and drinking water also provide magnesium, and that the amount in drinking water depends on its source and hardness: Harder water contains higher concentrations than soft water.

What reaches the body from the amount consumed

One figure puts all the table values into perspective, and it comes from the consumer advice centre: The body absorbs only about 30 to 50 percent of the magnesium consumed daily through food. This is already taken into account in the recommended intake levels (2026).

The second sentence is the crucial one. So there is no need to extrapolate the table values; the estimates from Chapter 3 already account for this loss.

According to the same source, how much is absorbed depends, among other things, on how well supplied the body is and how much is consumed at once: When nutrient status is poorer and smaller amounts are consumed more frequently, the body generally absorbs magnesium better.

What else affects absorption

The DGE names several substances that compete with one another. High amounts of calcium, phosphorus, iron, copper, manganese, or zinc could inhibit magnesium absorption, especially when they come from supplements. At the amounts found in foods, however, absorption is not impaired (as of September 10, 2025).

In practical terms, anyone taking several mineral supplements at the same time should mention this. Those who obtain them through food do not need to separate them or time their intake.

Excretion is another factor. According to the same source, caffeine and alcohol can increase magnesium excretion through the kidneys. This is not a prohibition, but an explanation of why some people excrete more than the table might suggest.

The consumer advice center also cites the solubility of the magnesium salt, the composition of the diet—such as the amount of fiber, phytate, and free fatty acids—and the time food spends passing through the digestive tract as additional factors (2026).

When a deficiency actually develops

The figures in Chapter 4 might lead one to suspect a widespread deficiency. The expert sources see it differently—and quite clearly so.

The consumer advice center phrases it almost identically: Magnesium deficiency is rare in Germany (2026). Both statements are attributed to the institution and not to an individual person.

How a deficiency typically develops

The DGE describes it as a secondary consequence rather than a nutritional problem: A deficiency develops as a result of impaired magnesium absorption in the intestine or increased excretion through the kidneys. Causes it cites include acute or chronic diarrhea, vomiting, malabsorption, procedures involving the small intestine, kidney disease, chronic alcohol consumption, and the long-term use of certain medications such as diuretics, antibiotics, or oral contraceptives.

The same source states the following signs: Initial signs may include loss of appetite, nausea, vomiting, fatigue, and general weakness. As for the threshold, symptoms of magnesium deficiency do not appear until serum concentrations are very low—below 0.5 millimoles per liter (2025).

For comparison, the IQWiG gives a reference range of 0.70 to 1.05 millimoles per liter for adults over 18 (as of 20 March 2025). The symptom threshold is therefore well below the lower reference value, not just slightly below it.

What dietary supplements contribute

For hardly any mineral is the gap between what is on the shelves and the available evidence so wide. Here, one distinction underpins the entire section: The warnings concern supplements, not food.

The DGE states: No negative effects have so far been observed in healthy people with a high intake of magnesium from food. For supplements, however, the BfR recommends a maximum amount of 250 milligrams per recommended daily serving, and adults may experience diarrhea from as little as 300 milligrams per day from food supplements (as of 10 September 2025).

What is actually on the shelves

The Verbraucherzentrale checked this. A 2020 investigation by the Verbraucherzentralen found that 57 percent of the magnesium-containing food supplements examined contained a higher amount than the BfR's recommended maximum daily dose of 250 milligrams (as of 18 February 2026).

So more than half of the products exceeded the recommendation of the authority responsible for risk assessment. Anyone taking a supplement should therefore look at the number on the packaging, not at its presentation.

The BfR also recommends spreading the daily dose over at least two intakes per day. This is consistent with what Chapter 6 says about absorption: Smaller amounts are absorbed better.

What applies to fortified foods

In addition to supplements, there are foods to which magnesium is added. According to the Verbraucherzentrale, the BfR also specifies maximum amounts for these: 31 milligrams per 100 grams for solid foods and 8 milligrams per 100 milliliters for liquid foods (2026).

These figures are low. The sources reviewed do not provide a rationale for them; in this editorial team's assessment, they represent a safety margin, since consuming several fortified products a day could otherwise result in an unintended total.

Who may be at risk of falling short

The following comparison summarizes what the sources say about the individual groups. It distinguishes between requirements and actual intake, because the two are often conflated.

This comparison includes a point that is easy to misread. The consumer advice centre identifies adolescents and older people as groups with poorer provision, while the DGE sees no increased requirement for older people.

This is not a contradiction. Requirement is what the body needs; intake is what is actually consumed. Both statements can stand side by side, and they do so in the sources as well.

What is and is not established about sports

Because magnesium is rarely absent from a sports supplement shelf, this point should be addressed separately. The DGE states that it is currently disputed whether physical activity increases mineral losses through urine or stool, and that this may depend on exercise intensity and training volume.

The consumer advice centre adds that the requirement may be higher in cases of heavy sweating from competitive sports or working in the heat, as well as during stress (2026). This is a possibility, not a figure, and the verified sources provide no more information on this point.

Where you can put your results into context

If the topic came up because of symptoms, looking at several electrolytes at once is more relevant than looking at magnesium alone. A capillary blood test from mybody®x (MYBODY Lab GmbH) measures this group together. What such a result does and does not indicate is explained directly below in Chapter 11, before you click.

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Limitations: what a blood magnesium value tells you

This chapter is among the more uncomfortable ones that a blood-test provider can write, which is why it is included here in full.

The DGE states that there is currently no suitable biomarker for determining magnesium status (as of 09/10/2025). It does not mention this in passing, but as one of the reasons why it switched from a recommended intake to an estimated value in 2021.

The explanation follows on from Chapter 1. Ninety-nine percent of magnesium is found inside cells, in bones, muscles, and soft tissue; only 1 percent is present in extracellular fluid (DGE, 2025). IQWiG puts the proportion in the blood at 1 to 2 percent of total magnesium (as of 03/20/2025).

This leads to a clear limitation for every blood test, including this one: A blood magnesium value describes a small, well-regulated proportion at a particular point in time. According to the descriptions by these two organizations, it says little about the body's total stores, and this article claims nothing else.

What the value is nevertheless measured for

IQWiG states the reason: Doctors measure the magnesium concentration in the blood when they suspect a deficiency or excess because of certain symptoms, for example frequent muscle cramps or cardiac arrhythmias (2025).

So the value has its place, namely in the context of symptoms and in consultation with a doctor. What it is not is an indication of whether your diet provides enough magnesium. The table in Chapter 6 answers this question better than any blood test.

The consumer advice centre generally points out regarding self-tests that they can provide only an indication and should be confirmed by a laboratory test before taking high-dose dietary supplements (as of 06/01/2026). This remains unchanged even though the test is presented here.

What you can change starting tomorrow

If you take away just one action from this article, let it be this: Put a bowl of sunflower or pumpkin seeds somewhere you will naturally reach for something anyway. Twenty grams is a small handful and provides 67 or 57 milligrams, respectively, according to the DGE overview.

The reason is in Chapter 4. The gap between the median intake and the estimate is 16 milligrams for women and 5 milligrams for men. A handful of seeds covers this gap several times over, and it is the only step in this article that requires neither planning nor a change in routine.

The second action concerns what you already drink. If you check the label of your mineral water, you will know within ten seconds whether it contains at least 50 milligrams per liter. The water in the DGE example day provides 45 milligrams in one and a half liters, as much as a banana. Water labeled as containing magnesium would provide more than that in the same quantity.

There is a third action only if you already take a supplement: Check the amount per daily dose. If it is more than 250 milligrams, it exceeds the BfR recommendation, and according to the Verbraucherzentralen’s 2020 investigation, more than half of the products do.

The starting question was which foods provide magnesium. The evidence-based answer is straightforward: seeds, rolled oats, whole grains, green vegetables, potatoes, and mineral water, in servings that add up over the course of the day. And the second answer, which is less often mentioned: Deficiency is rare with a balanced diet, and last night’s calf cramp probably had another cause.

Frequently asked questions

Sources

1. German Nutrition Society (DGE): Selected questions and answers about magnesium (as of 10 September 2025) – dge.de
2. German Nutrition Society (DGE): Magnesium reference values (basis of derivation as of 2021) – dge.de
3. German Nutrition Society (DGE): Revised reference values, press release 36/2021 – dge.de
4. Consumer Advice Centre: Magnesium: what should you consider? (as of 18 February 2026) – verbraucherzentrale.de
5. Institute for Quality and Efficiency in Health Care (IQWiG): Magnesium, gesundheitsinformation.de (as of 20 March 2025) – gesundheitsinformation.de
6. Federal Institute for Risk Assessment (BfR): Recommended daily upper limit for magnesium intake from food supplements, Opinion No. 034/2017 dated 12 December 2017 – bfr.bund.de
7. Consumer Advice Centre: Which vitamin deficiency tests are useful? (as of 06/01/2026) – verbraucherzentrale.de
8. Federal Centre for Nutrition (BZfE): Minerals (as of 29/10/2025) – bzfe.de
9. Max Rubner Institute (MRI): German National Nutrition Survey II, food consumption and nutrient intake based on 24-hour recalls, survey conducted from November 2005 to January 2007 – mri.bund.de

The statements regarding the missing biomarker, the distribution of 99 and 1 percent, the rarity of a deficiency, the signs and symptom threshold of 0.5 millimoles per liter, the causes of a secondary deficiency, the systematic review of nocturnal muscle cramps, the BfR maximum amount of 250 milligrams, diarrhea from 300 milligrams, the average intakes of 284 and 345 milligrams, beverages and water hardness, sports, and people aged 65 and over, as well as the values in the food table, are taken from source [1]. The estimates of 350 and 300 milligrams come from [2], while the rationale for switching to estimated values comes from [1] and [3]. The proportions of 30 and 60 percent, the note that this does not necessarily indicate a deficiency, the information on calf cramps, absorption of 30 to 50 percent, labeling of mineral water from 50 milligrams per liter, risk groups, the 57 percent of preparations, and organic and inorganic compounds come from [4]. The information on the proportion in blood, the reference range, and the reason for a measurement comes from [5]. The recommendation to spread out the daily dose comes from [6]. The statements on recreational sports and self-tests come from [7]. The qualitative mention of food groups containing magnesium comes from [8], and the survey period of the German National Nutrition Survey II comes from [9]. Information on price, measured values, sample type, processing times, and laboratory comes from the mybody®x product page, accessed on 28/08/2026. All sources were accessed and checked on 28/08/2026.

mybody®x Editorial & Expert Team

Nutritional science Laboratory diagnostics Blood analysis interpretation Nutrigenetics

This article was created by the mybody®x editorial and expert team. The team combines laboratory diagnostics, nutritional science, and the interpretation of blood analyses. The people involved can be found on the authors page.

Published on 28/08/2026 · Last updated on 28/08/2026

The content is intended for general information and does not replace medical advice, diagnosis, or treatment. Reference ranges depend on the laboratory, method, and age—always follow the information on your test report.