Magnesium

What is magnesium?

Magnesium (Mg) participates in enzyme reactions. Dietary sources include pulses, nuts, whole grains and green leafy vegetables. [4]

For intake calculations, elemental magnesium is what counts. A 1,000 mg quantity of a magnesium compound is not necessarily 1,000 mg of magnesium. Compare the declared magnesium content per daily serving and check whether that serving means one capsule or several.

Citrate, bisglycinate or oxide?

These names identify different compounds of the same element. There is no useful universal ranking: content, formulation, tolerance and the application actually studied all matter. A bisglycinate trial does not automatically establish the same effect for oxide or another finished product.

A large compound weight does not replace a transparent nutrient declaration. For example, if the label states that a daily serving supplies 150 mg of magnesium, count 150 mg in the intake total, regardless of the weight of the other components of the compound.

Function, sufficiency and additional benefit

Three questions need separate answers. What does the nutrient do? Is dietary intake adequate? Does an additional dose improve a particular problem? A normal physiological function alone does not demonstrate an extra benefit from taking more when intake is already sufficient.

The sections below therefore distinguish reference values from clinical findings. The plant perspective examines field research and nutrient diagnostics; a vineyard result cannot determine a human dose.

How much magnesium?

EFSA uses Adequate Intakes (AIs), because an average requirement could not be established reliably. These values refer to total daily intake. [1]

Putting the numbers into context

BfR proposes a maximum of 250 mg magnesium per recommended daily serving of a food supplement for people aged 15 and over. Dividing it into at least two portions is intended to improve tolerance. This is a risk-assessment proposal, not an instruction for everyone to take that amount. [3]

Start with a complete overview: food, fortified products and every supplement used. When combining products, add their magnesium quantities together. A sports product, a mineral preparation and an evening blend may contain the same nutrient.

A single day's intake below an AI does not demonstrate deficiency. Conversely, one laboratory value does not automatically explain recurring symptoms. The question of additional magnesium starts with diet, symptoms, medicines and clinical context.

What does research say about cramps and sleep?

When is closer attention needed?

Older adults and people with gastrointestinal disease, type 2 diabetes or long-term use of certain medicines may have a greater risk of inadequate status. Impaired kidney function can reduce the ability to remove excess magnesium. [4]

Magnesium can interfere with absorption of certain antibiotics and bisphosphonates; check timing with a pharmacist or clinician. Diarrhoea is a common adverse effect of additional amounts. Recurring cramps or sleep problems are not a reliable self-test for deficiency. [4]

What do authorised claims mean?

The EU list includes normal muscle and nervous-system functions and energy metabolism. Use requires, among other conditions, that a food qualifies as a magnesium source. This does not create a treatment claim for insomnia or cramps. [11]

In Switzerland, the authorised claims and conditions in the food-information ordinance, or a specific FSVO authorisation, apply. A published study does not authorise a product claim. [12]

What do field studies show?

Establish the cause before adding nutrients

The Swiss GRUD guidance describes nutrient diagnostics and deficiency symptoms in vines. Leaf findings, soil testing and nutrient interactions need to be considered together. Interpretation of leaf values depends on grape variety and sampling time. [10]

• Record the crop and growth stage; one discoloured leaf is not a diagnosis.
• Take soil and, where appropriate, leaf samples according to relevant professional guidance.
• In fertiliser planning, distinguish Mg from the declaration form MgO. Figures with different bases cannot be compared directly.
• Record the intervention and assess its effects under comparable conditions. These studies do not establish one application rate for all plants.