Altroconsumo investigation: magnesium and potassium supplements
Every summer, Italians spend millions on effervescent sachets and mineral tablets.
Aggressive advertising promotes magnesium and potassium as miracle cures for fatigue, cramps, and exhaustion caused by the heat. But is this really true? According to Altroconsumo, not quite. And believing the hype could cost consumers dearly – unnecessarily.
Supplement Season: Marketing or Medical Need?
As temperatures rise, products containing magnesium and potassium flood store shelves and TV screens. Brands like Polase, Supradyn, Sustenium, and MGK VIS ride the seasonal mantra:
- “Beat the heat with your ally against physical fatigue”,
- “Prevent cramps and tiredness caused by heat or heavy sweating”.
But Altroconsumo dismantles these claims. Their investigation shows a banana contains more potassium than four sachets of supplement, and 30 grams of almonds equals two sachets of magnesium. The supposed “emergency need” for supplementation is a well-crafted advertising narrative – not science.
Magnesium and potassium: vital functions, real benefits
Magnesium plays a role in hundreds of biochemical reactions: from protein synthesis to energy production, bone health, and proper nervous system function. Potassium helps regulate nerve impulses, muscle contractions, and blood pressure.
Still, deficiencies in healthy individuals are rare. A balanced and varied diet already provides enough to support the body — even during the hottest months.
Do you really need supplements to replenish magnesium and potassium?
Let’s be clear: the answer is no. Unless you have a confirmed deficiency or a medical condition requiring supplementation, taking these products isn’t necessary.
The Italian Society of Human Nutrition (SINU) has defined optimal daily intake levels for healthy individuals, offering cardiovascular and renal benefits above mere basic needs. According to EFSA (European Food Safety Authority), the minimum effective levels are:
- 300 mg of magnesium for an adult woman
- 3,500 mg of potassium for an average adult
These quantities are easily achievable through food – no need for sachets or tablets.
Is diet enough?
Absolutely. Both SINU and EFSA agree: a well-balanced diet more than covers daily magnesium and potassium requirements.
Magnesium is found in:
- Whole grains
- Leafy green vegetables
- Legumes
- Nuts
- Cheese, seafood, coffee, and water
Potassium is abundant in:
- Legumes
- Fresh fruits and vegetables
- Meat and fish
- Dairy products, cereals, coffee, and water
Fresh, unprocessed foods are ideal, as cooking can reduce mineral content. And thanks to the kidneys, our bodies regulate mineral levels effectively – even in hot weather.
Symptoms and misconceptions
Cramps, muscle weakness, and fatigue are often blamed on mineral deficiencies. But Altroconsumo emphasizes that these symptoms are typically multifactorial – and rarely linked to low magnesium or potassium.
Even the winter versions of these supplements – like Polase Defense or Polase Winter – have no scientific basis. Their only real benefit? You end up drinking a glass of water to dissolve the sachet.
Health claims: a fine line
Regulations allow supplement manufacturers to display factual statements about the physiological roles of these minerals:
- Magnesium: “Helps reduce fatigue; supports psychological and muscular function”.
- Potassium: “Contributes to normal nervous system function and blood pressure”.
But be careful – these are not proven therapeutic effects. The confusion arises when marketing exaggerates these roles, creating expectations that aren’t scientifically supported.
When can supplements be harmful?
In food form – even in large amounts – magnesium and potassium are safe. But supplements, if misused or taken for extended periods, can trigger side effects, especially in vulnerable individuals.
Magnesium:
- Common side effects: diarrhea, nausea, vomiting, abdominal pain
- Severe cases: slow heartbeat, low blood pressure, respiratory depression, cardiac arrest
Potassium:
- Gastrointestinal issues
- Muscle weakness, paralysis
- Heart rhythm disturbances, palpitations, tingling in limbs
Key contraindications
Magnesium and potassium supplements should be avoided or used with caution in cases of:
- Kidney dysfunction: increased risk of mineral overload
- Diabetes and hypertension: potential for drug interactions
- Older age: reduced kidney function and multiple medications
- Concurrent medications: possible interactions with antibiotics, antiepileptics, levothyroxine, and osteoporosis treatments
Expert Advice
“There’s no need to rush out and buy magnesium and potassium supplements in summer. Sweat doesn’t cause significant losses of these minerals, and deficiencies are rare. A varied and balanced diet is enough to meet daily requirements”
Irene Pignata, Pharmacist and Altroconsumo Expert
