Magnesium supplements are no longer limited to a choice between citrate and oxide. Newer formulas combine different magnesium compounds to create a broader nutritional profile and improve everyday convenience. Eterna Vita Magnesium L-Threonate + Bisglycinate Complex brings together magnesium L-threonate, bisglycinate and taurate, supported by vitamin B6 in its active P-5-P form.
One daily serving provides 266 mg of elemental magnesium, equivalent to 71% of the EU reference intake. The combination is aimed at adults who want a premium magnesium product for a daily routine focused on the nervous system, energy metabolism, muscle function and psychological wellbeing. However, it is important to distinguish the well-established nutritional roles of magnesium from the more preliminary research surrounding individual forms.
Why Magnesium Matters
Magnesium is an essential mineral and a cofactor in hundreds of enzyme systems. It is involved in energy production, protein synthesis, nerve signalling, muscle contraction and the movement of other electrolytes across cell membranes. A substantial proportion of the body’s magnesium is stored in bones, with the remainder distributed through muscles and other soft tissues.
European authorised health claims state that magnesium contributes to:
- normal functioning of the nervous system;
- normal psychological function;
- normal muscle function;
- normal energy-yielding metabolism;
- electrolyte balance;
- normal protein synthesis;
- the reduction of tiredness and fatigue;
- the maintenance of normal bones and teeth.
These claims describe normal physiological functions. They do not mean that magnesium is a treatment for anxiety, insomnia, neurological disease or chronic fatigue. Symptoms such as tiredness, poor sleep and muscle cramps can have many causes, and magnesium is only one possible factor.
Understanding the 266 mg Figure
Mineral labels can be confusing because the weight of a magnesium compound is not the same as the amount of magnesium it supplies. The daily serving of this Eterna Vita formula contains:
- Magnesium L-threonate – 1,000 mg
- Magnesium bisglycinate – 1,200 mg
- Magnesium taurate – 300 mg
- Total elemental magnesium – 266 mg
- Vitamin B6 as P-5-P – 1.4 mg
The 266 mg value is therefore the nutritionally relevant amount of magnesium contributed by all three compounds together. The larger milligram figures describe the complete molecules, including the L-threonate, glycine and taurine portions bound to the mineral.
Magnesium L-Threonate: An Emerging Form
Magnesium L-threonate is a magnesium salt of threonic acid. It has attracted attention because preclinical research suggests it may influence magnesium availability in the central nervous system. Human studies have subsequently explored possible effects on sleep and cognitive performance, but the clinical evidence base remains relatively small.
A 2024 randomised controlled trial gave 1 gram of magnesium L-threonate or placebo to 80 adults with self-reported sleep problems for 21 days. Researchers reported differences in selected sleep-stage, readiness and daytime-function measures. Interpretation requires caution: the sample was modest, the intervention was brief and some authors were affiliated with the ingredient supplier.
In a 2026 double-blind trial, 100 adults aged 18–45 with dissatisfied sleep received 2 grams of a branded magnesium L-threonate ingredient or placebo for six weeks. Some cognitive measures, reaction time and self-reported sleep-related impairment improved. However, the groups did not differ on several other cognitive and sleep measures, including objective sleep outcomes from a wearable ring. The study was commercially funded.
These trials make L-threonate scientifically interesting, but they do not establish it as a treatment for insomnia, memory loss or brain ageing. They also evaluated a particular branded ingredient, so the results cannot automatically be transferred to every L-threonate supplement. Eterna Vita provides 1,000 mg of magnesium L-threonate within its combined daily formula.
Magnesium Bisglycinate: A Chelated Option
In magnesium bisglycinate, magnesium is chelated to the amino acid glycine. This form is widely chosen by consumers who prefer a non-oxide magnesium supplement and want a formula suitable for regular use. Although bisglycinate is commonly described as highly absorbable and gentle on digestion, direct head-to-head human evidence comparing every magnesium form remains limited.
A 2025 placebo-controlled trial studied 155 adults reporting poor sleep. Participants received magnesium bisglycinate supplying 250 mg of elemental magnesium daily for four weeks. Insomnia Severity Index scores improved slightly more than with placebo, but the effect was small and other psychological outcomes did not differ. The findings suggest a possible modest benefit, particularly in people with lower dietary magnesium intake, rather than a reliable sedative effect.
The Eterna Vita formula contains 1,200 mg of magnesium bisglycinate as one part of its three-form blend. The product page does not specify how the total 266 mg of elemental magnesium is divided between the individual compounds.
What Does Magnesium Taurate Add?
Magnesium taurate combines magnesium with taurine, an amino-sulfonic compound naturally present in the body. Taurine participates in several physiological processes and is frequently included in products positioned for nervous-system or cardiovascular support.
Research specifically testing magnesium taurate in humans is far less developed than research on magnesium in general. Its inclusion creates a more varied formula, but it should not be used to claim that this product prevents cardiovascular disease, lowers blood pressure or treats another medical condition. The daily serving provides 300 mg of the magnesium taurate compound.
Vitamin B6 in the P-5-P Form
The formula includes 1.4 mg of vitamin B6, equal to 100% of the EU reference intake. Pyridoxal-5-phosphate, usually shortened to P-5-P, is the coenzyme form used in many vitamin B6-dependent reactions.
Like magnesium, vitamin B6 contributes to normal functioning of the nervous system, normal psychological function, normal energy-yielding metabolism and the reduction of tiredness and fatigue. It also contributes to normal protein and glycogen metabolism. The amount in this product is nutritional rather than a high-dose B6 regimen.
Can This Magnesium Complex Improve Sleep?
Magnesium is often marketed as a natural sleep aid, but the overall evidence is mixed. Recent trials of L-threonate and bisglycinate are promising, yet they have generally been short, used selected participant groups and reported modest or inconsistent effects. Magnesium is not equivalent to a sleeping medication and may be more relevant when dietary intake is low.
A supplement should sit alongside the fundamentals of healthy sleep:
- a regular sleeping and waking schedule;
- reduced bright light and stimulating activity late in the evening;
- limited caffeine later in the day;
- a quiet, dark and comfortably cool bedroom;
- medical assessment for persistent insomnia, loud snoring or daytime sleepiness.
There is no strong evidence that one universal time of day is best for taking magnesium. Some people prefer an evening routine, while others divide their intake. Follow the label and choose a consistent schedule that is comfortable for you.
How to Use the Product
The manufacturer recommends three capsules per day, unless a doctor advises differently. With 120 capsules, one bottle provides 40 daily servings. Do not exceed the recommended amount.
If you are new to magnesium supplements or have a sensitive digestive system, taking the capsules with a meal may be more comfortable. Consider magnesium from other supplements, electrolyte powders, antacids or laxatives when calculating your total supplemental intake. Food sources do not need to be restricted: leafy green vegetables, legumes, nuts, seeds and whole grains remain valuable parts of a magnesium-rich diet.
Clean, Vegan Capsule Format
Eterna Vita Magnesium Complex uses vegetable HPMC capsules and is suitable for vegans. According to the product information, it contains no gluten, lactose, GMO ingredients, sucrose or titanium dioxide. The short list of inactive ingredients consists of the capsule shell, microcrystalline cellulose and silicon dioxide.
This makes it an attractive option for adults who value a clearly labelled, multi-form formula and would rather take capsules than prepare a magnesium powder or drink.
Safety and Medication Interactions
Supplemental magnesium can cause loose stools, nausea or abdominal discomfort, although tolerance varies by dose and form. Stop using the product and seek advice if you experience a significant or persistent adverse reaction.
People with impaired kidney function require particular caution because the kidneys normally remove excess magnesium. Do not use a magnesium supplement with kidney disease unless your clinician has confirmed that the dose is appropriate. Pregnant or breastfeeding women and people receiving treatment for a chronic condition should also discuss supplementation with a healthcare professional.
Magnesium can reduce the absorption of certain medicines. Tetracycline and quinolone antibiotics generally need to be taken several hours apart from magnesium, while oral bisphosphonates also require separation. Ask a pharmacist for instructions specific to your medicine rather than relying on a universal timing rule.
The daily serving contains 266 mg of supplemental magnesium. Because safety reference values and national guidance differ, avoid combining it with additional high-dose magnesium products unless advised by a professional.
Who Is This Formula Best Suited For?
This complex may appeal to adults who:
- want 266 mg of elemental magnesium in a clearly defined serving;
- prefer a combination of L-threonate, bisglycinate and taurate;
- are looking for a vegan, gluten-free and lactose-free capsule;
- want magnesium with a nutritional amount of active vitamin B6;
- prefer a 40-day capsule supply over powders or flavoured drinks.
It is less appropriate for anyone expecting an instant sedative, a proven cognitive enhancer or a treatment for unexplained fatigue. Persistent sleep, memory, mood, muscle or energy problems deserve proper medical evaluation.
The Bottom Line
The main strength of this product is its thoughtful combination of three magnesium compounds. Each daily serving provides 1,000 mg of magnesium L-threonate, 1,200 mg of magnesium bisglycinate and 300 mg of magnesium taurate, delivering a total of 266 mg of elemental magnesium together with 1.4 mg of vitamin B6 as P-5-P.
Magnesium has well-established roles in normal nerve, muscle, energy and psychological function. Early clinical studies of L-threonate and bisglycinate also offer interesting findings for sleep and cognition, but the results remain preliminary, formulation-specific and sometimes commercially funded. Realistic expectations are therefore essential.
For the full composition, recommended use and current availability, visit Eterna Vita Magnesium L-Threonate + Bisglycinate Complex at Biolekarna.cz.
This article is intended for general information and does not constitute medical advice. Food supplements should not replace a varied diet or treatment recommended by a qualified healthcare professional.
