Magnesium Tablets: What to Know, How to Choose, and Safety

How it works

Magnesium is an essential mineral that plays a critical role in a wide variety of physiological processes in the human body. Approximately 50% to 60% of the body's total magnesium is stored in the bones, with the remainder distributed in muscles, soft tissues, and a small amount in blood serum. This mineral is a cofactor in more than 300 enzymatic reactions, many of which are fundamental to cellular energy production, protein synthesis, and nucleic acid metabolism.

Magnesium contributes to a reduction of tiredness and fatigue when consumed in adequate amounts as a source of magnesium.

Magnesium is necessary for the normal function of nerves and muscles, including the regulation of muscle contraction and the transmission of nerve impulses. It is also involved in maintaining the structural development of bone and is required for the synthesis of DNA, RNA, and the antioxidant glutathione.

Dietary magnesium comes primarily from foods such as nuts (especially almonds and cashews), seeds (pumpkin and chia), whole grains (brown rice, oats), legumes, and leafy green vegetables (spinach, kale). However, the magnesium content of plant foods can vary depending on soil quality and food processing methods. Some individuals may have difficulty meeting their magnesium needs through diet alone, particularly if they consume a diet low in whole plant foods or have increased physiological requirements.

Magnesium tablets are used to supplement dietary intake. They are formulated to provide a measured dose of magnesium in a convenient form. The absorption of magnesium from tablets depends on several factors, including the chemical form of magnesium, the presence of other nutrients, and individual digestive health.

What the research and authorised claims say

Within the European Union, only specific health claims for magnesium are authorised. These claims may be used only for foods or supplements that are at least a source of magnesium, defined as providing at least 15% of the nutrient reference value (NRV) per portion. The following claims are authorised and reflect the established physiological roles of magnesium in the human body:

• Magnesium contributes to the maintenance of normal bones.
• Magnesium contributes to normal energy-yielding metabolism.
• Magnesium contributes to a reduction of tiredness and fatigue.
• Magnesium contributes to normal muscle function.
• Magnesium contributes to the normal functioning of the nervous system.

No other health or disease-related claims are permitted for magnesium supplements. These claims are based on the essential functions of magnesium in cellular energy production, neuromuscular transmission, and bone structure.

Magnesium contributes to normal muscle function when taken as a source of magnesium.

The authorised claims do not imply that supplementation will provide benefits beyond correcting a dietary insufficiency or supporting normal physiological functions.

Key limitations

• They are not a substitute for a varied and balanced diet.
• Only the authorised claims listed above may be used. No other effects should be expected or implied, and unapproved claims are not permitted.
• Individual needs for magnesium may vary depending on age, sex, dietary habits, and health status. Factors such as high levels of physical activity, pregnancy, lactation, and certain health conditions may increase magnesium requirements.
• Excessive magnesium intake from supplements may cause gastrointestinal discomfort, including diarrhoea, nausea, and abdominal cramping. The body regulates magnesium absorption and excretion, but high supplemental doses can overwhelm these mechanisms.
• Magnesium from food sources is not associated with adverse effects in healthy individuals, but high-dose supplements can pose risks, especially for those with impaired kidney function.
• Magnesium tablets should not be used as a replacement for medical treatment or as a means to self-diagnose or manage health conditions.

How to choose

With 776 magnesium products available in Tigoo's range, choosing the right magnesium tablet can be challenging. The market offers a wide variety of formulations, doses, and additional ingredients. Here are some factors to consider when selecting a magnesium supplement:

• Form of magnesium: The most common forms in Tigoo's range are magnesium citrate (39 products) and magnesium oxide (30 products). Other forms include magnesium bisglycinate, magnesium malate, and magnesium sulfate. The chemical form affects both the amount of elemental magnesium provided and its absorption in the digestive tract.
• Elemental magnesium content: The amount of actual magnesium (elemental magnesium) varies by form. For example, magnesium oxide contains a higher percentage of elemental magnesium than magnesium citrate, but citrate may be more easily absorbed. Always check the label for the amount of elemental magnesium rather than the compound weight.
• Dosage: The median dose per tablet in Tigoo's range is 120 mg. Some products offer higher doses, such as 250 mg or 500 mg per tablet. The appropriate dose depends on your dietary intake, individual needs, and the advice of a healthcare professional.
• Additional ingredients: Some tablets may include vitamin B6 or other nutrients, which may be added to support magnesium metabolism or offer additional nutritional benefits. Always check the ingredient list for potential allergens or sensitivities.
• Tablet size and swallowing: Magnesium tablets can vary significantly in size. If you have difficulty swallowing pills, consider smaller tablets or alternative forms such as powders, chewables, or effervescent tablets.
• Suitability for dietary preferences: If you follow a vegetarian, vegan, or allergen-free diet, check for appropriate certification or allergen statements on the product label.
• Price and value: Compare the cost per mg of elemental magnesium rather than just the price per tablet or per package. This helps ensure you are getting good value for the amount of magnesium provided.
• Brand reputation and quality control: Consider products from reputable brands that follow good manufacturing practices and provide transparent labelling.

Comparison of common magnesium forms in Tigoo's range

Form	Number of Products	Elemental Magnesium (%)	Common Uses
Magnesium citrate	39	~16%	General supplementation, absorption focus
Magnesium oxide	30	~60%	Higher elemental content, less absorption
From magnesium citrate	19	~16%	Similar to citrate
From magnesium oxide	12	~60%	Similar to oxide

Table: Common magnesium forms in Tigoo's range, with approximate elemental magnesium content.

The choice between different forms often comes down to a balance of elemental magnesium content, absorption rate, and personal tolerance. For example, while magnesium oxide provides more elemental magnesium per gram, it is less soluble in water and may be less well absorbed in the digestive tract compared to more soluble forms like magnesium citrate. Some individuals may also find certain forms more likely to cause gastrointestinal side effects.

What to compare when buying magnesium tablets

• Check the magnesium form — citrate and oxide are most common, but absorption and tolerance may differ.
• Review the dose per tablet — the median is 120 mg, but products range from 50 mg to 500 mg. Consider your total daily magnesium intake from all sources.
• Look for clear labelling — ensure the product states the amount of elemental magnesium, not just the compound weight.
• Consider dietary needs — if you follow a vegetarian or vegan diet, check for suitable certification. Some tablets may contain animal-derived ingredients or allergens.
• Assess value — compare price per mg of elemental magnesium, not just per tablet. This is especially relevant when comparing products with different forms and potencies.
• Check for additional nutrients — some products include vitamin B6 or other vitamins and minerals. Consider whether these are necessary for your needs.
• Evaluate packaging and shelf life — magnesium tablets should be stored in a cool, dry place. Check the expiration date and packaging integrity.

When starting a new supplement, it is advisable to begin with the lowest effective dose and monitor for any adverse effects. If you have any underlying health conditions or take medications, consult a healthcare professional before use.

Safety, interactions and risk groups

Magnesium tablets are generally considered safe for most adults when used as directed and within recommended dosages. However, excessive intake from supplements can cause gastrointestinal symptoms such as diarrhoea, nausea, and abdominal cramping. The tolerable upper intake level (UL) for supplemental magnesium for adults is set to help prevent these effects.

Individuals with impaired kidney function are at higher risk for magnesium accumulation, as the kidneys are responsible for excreting excess magnesium. For these individuals, even moderate doses of supplemental magnesium may lead to elevated blood magnesium levels, which can be dangerous.

Magnesium can interact with certain medications. For example, some diuretics, antibiotics (such as tetracyclines and quinolones), and medications for osteoporosis may interact with magnesium, affecting either the absorption of the drug or the mineral. It is important to separate the timing of magnesium supplements and these medications to avoid reduced efficacy.

Pregnant and breastfeeding individuals may have increased magnesium needs, but supplementation should only be considered under medical supervision. Children and adolescents should only use magnesium supplements if recommended by a healthcare professional, as their requirements and tolerances differ from adults.

Always follow the recommended dosage on the product label and do not exceed the upper intake level unless advised by a healthcare provider. If you experience persistent gastrointestinal symptoms or signs of magnesium excess (such as muscle weakness, low blood pressure, or irregular heartbeat), discontinue use and seek medical advice.

Magnesium supplements should not be used as a substitute for a varied and balanced diet. The best way to meet magnesium needs is through a combination of dietary sources and, if necessary, supplementation under professional guidance.