MitoGenix Guides
Magnesium Glycinate and Sleep: What the Research Shows
People in South Africa searching for magnesium glycinate usually want to know two things: what it is, and whether it does anything for sleep. The honest answer to the second is "a little, for some people, and the evidence is weak". This guide shows what was actually tested, at what dose, and where the limits are.
What magnesium is for
Magnesium is an essential mineral involved in energy metabolism, normal muscle function and nervous-system function. Most adults get some from food (nuts, seeds, legumes, whole grains, leafy greens), and a supplement is one way to top up. Our capsule is labelled for exactly those functions.
What "glycinate" means
Magnesium has to be bound to something to be made into a supplement. In glycinate (also called bisglycinate) it is bound to glycine, an amino acid. Citrate, oxide and other forms use different partners and carry different amounts of elemental magnesium per gram.
One thing to be clear about: almost all the research below tested magnesium in general, in a mix of forms. Only one trial tested magnesium bisglycinate directly. There is no good evidence that glycinate is proven better than other forms at supporting sleep, so we don't claim it.
What the research found
| Study | Who and what | What it reported |
|---|---|---|
| Schuster et al., 2025 [2] | 155 adults aged 18 to 65 with poor self-reported sleep. 250 mg elemental magnesium daily as bisglycinate, or placebo, for 4 weeks. | Insomnia severity scores fell more in the magnesium group (-3.9 vs -2.3, p = 0.049). The effect size was small (d = 0.2), and other psychological outcomes did not differ. Exploratory analysis suggested larger changes in people with lower dietary magnesium. |
| Mah and Pitre, 2021 [3] | 3 randomised trials, 151 older adults with insomnia. | Time to fall asleep was about 17 minutes shorter with magnesium. Total sleep time was about 16 minutes longer but not statistically significant. All trials were at moderate to high risk of bias and the evidence was low to very low quality. |
| Arab et al., 2023 [4] | 9 studies, 7,582 people (observational studies and trials). | Observational studies linked magnesium status with sleep quality. The randomised trials gave contradictory results. |
| Rawji et al., 2024 [5] | 15 interventional trials covering sleep and anxiety outcomes. | Most trials showed improvement in at least one measure, but the trials were small, used different doses and forms, and some included other active ingredients. |
| Lopresti et al., 2026 [6] | 12 randomised trials of magnesium alone for sleep. | Findings were inconsistent and the certainty of evidence was low to very low. The authors say it may give modest benefits on some self-reported measures for some adults, but does not support magnesium as a routine treatment for insomnia. |
What this adds up to
- The single trial that tested bisglycinate found a small, modest improvement in self-reported insomnia severity over four weeks.
- The wider reviews find mixed results and low-certainty evidence.
- Nothing here shows magnesium glycinate fixes sleep problems, and nothing here is a reason to skip a doctor if sleep is a real problem for you.
How the dose compares with the label
| Source | Elemental magnesium |
|---|---|
| Schuster 2025 trial (daily) | 250 mg, as bisglycinate |
| MitoGenix Magnesium Glycinate, per capsule | 120 mg |
| MitoGenix Magnesium Glycinate, 2 capsules | 240 mg |
Our label states the elemental magnesium itself (120 mg per capsule, from magnesium glycinate at 18% elemental magnesium), not just the compound weight, so you can compare it with research doses directly. A two-capsule serving is close to the amount used in the trial. That is a dose comparison only, not a claim that this product was tested.
How to use it sensibly
- Follow the label: two capsules a day, and don't exceed the recommended dose.
- Magnesium from supplements can cause stomach discomfort or loose stools in some people, most often at higher doses.
- Count other sources. Many multivitamins, "sleep" blends and antacids contain magnesium too.
- Judge it over several weeks. The trial measured sleep over four weeks, not a single night.
Who it's not for
Magnesium supplements are not intended for:
- anyone under 18
- pregnant or breastfeeding women
If you have kidney problems, take medication, or have a known medical condition, speak to a healthcare professional first. Stop use if you get any adverse reaction.
Frequently asked questions
How much magnesium is in one capsule?
120 mg of elemental magnesium per capsule, and 240 mg per two-capsule serving, from 1,333 mg of magnesium glycinate at 18% elemental magnesium.
Is magnesium glycinate better than magnesium citrate?
They are different forms bound to different partners (glycine versus citric acid). The research reviewed here mostly tested magnesium in general, so it doesn't show one form is clearly better for sleep.
Will it help me sleep?
One trial of bisglycinate found a small, modest improvement in self-reported insomnia severity [2]. The wider reviews found mixed, low-certainty evidence [3][6]. Results vary from person to person.
Can I take it every day?
The label direction is two capsules a day, and not to exceed it. If you have a medical condition or take medication, check with a healthcare professional first.
Can I take it with a magnesium-containing multivitamin?
You'd be adding the amounts together, so count both. Don't exceed the recommended dose.
Where to find it
MitoGenix Magnesium Glycinate is a single-ingredient capsule with the elemental dose declared on the label, made in a GMP-certified facility in South Africa and independently tested, with no proprietary blends.
References
- National Institutes of Health, Office of Dietary Supplements. Magnesium: Fact sheet for consumers. https://ods.od.nih.gov/factsheets/Magnesium-Consumer/
- Schuster J, Cycelskij I, Lopresti A, Hahn A. Magnesium bisglycinate supplementation in healthy adults reporting poor sleep: a randomized, placebo-controlled trial. 2025. https://pubmed.ncbi.nlm.nih.gov/40918053/
- Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults: a systematic review and meta-analysis. 2021. https://pubmed.ncbi.nlm.nih.gov/33865376/
- Arab A, Rafie N, Amani R, Shirani F. The role of magnesium in sleep health: a systematic review of available literature. 2023. https://pubmed.ncbi.nlm.nih.gov/35184264/
- Rawji A, Peltier MR, Mourtzanakis K, et al. Examining the effects of supplemental magnesium on self-reported anxiety and sleep quality: a systematic review. 2024. https://pubmed.ncbi.nlm.nih.gov/38817505/
- Lopresti AL, Smith SJ, Drummond PD. Magnesium supplementation for sleep in adults: a systematic review of randomized controlled trials. 2026. https://pubmed.ncbi.nlm.nih.gov/42661485/
This health supplement is not intended to diagnose, treat, cure or prevent any disease. This unregistered medicine has not been evaluated by SAHPRA for its quality, safety or intended use. Health supplements are intended only to complement your diet.
