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Magnesium is one of those minerals that turns up in almost every conversation about sleep, cramps and stress. What rarely gets explained is that magnesium supplements differ enormously, and the difference is not the magnesium itself. It is what the magnesium is attached to.
Why the form matters
Magnesium is a metal. It cannot be sold on its own in a tablet, so it is bound to another molecule to make a stable salt. That partner molecule determines two things: how much of the tablet is actually magnesium, and how gently your gut handles it.
Two supplements can both say "magnesium" on the front and behave completely differently.
The common forms, plainly
- Magnesium oxide. Cheap and very high in elemental magnesium by weight, but poorly absorbed. A large share passes through the gut, drawing water with it, which is why it has a reputation for loosening stools.
- Magnesium citrate. Better absorbed than oxide. Also has a mild laxative effect at higher doses, which some people want and others do not.
- Magnesium glycinate. Magnesium bound to glycine, an amino acid. Well absorbed and generally the gentlest on the stomach, which is why it is usually recommended for people taking magnesium daily or in the evening. This is the form in our Magnesium Glycinate 500mg tablets.
- Magnesium sulphate. Epsom salts. Used in baths and, medically, by injection. Not a daily oral supplement.
Reading the label properly
"Magnesium glycinate 500mg" describes the weight of the compound, not the weight of magnesium in it. The amount of actual magnesium, called elemental magnesium, is a fraction of that, and the fraction differs by form. A well-labelled product tells you both numbers. If a label only gives you the big number, you cannot compare it with anything.
What magnesium contributes to
Magnesium contributes to normal muscle function, normal functioning of the nervous system, normal protein synthesis, the reduction of tiredness and fatigue, normal psychological function, and the maintenance of normal bones and teeth. Those are the established claims, and they are broad because magnesium is involved in hundreds of enzyme reactions.
What it is not is a sedative. People often describe feeling more settled when their intake improves, but magnesium does not work like a sleeping tablet, and persistent insomnia deserves a proper look rather than a supplement.
Food first
Magnesium is in pumpkin and sunflower seeds, almonds, cashews, chickpeas, lentils, spinach, whole grains and dark chocolate. A diet built on refined flour and little else tends to fall short. Supplements make more sense as a top-up to a reasonable diet than as a substitute for one.
Practical points
- Take it with food to reduce any stomach upset.
- Many people prefer the evening, simply because that is when muscle comfort and winding down matter most.
- Space it a couple of hours apart from iron or zinc supplements and from certain antibiotics, as minerals compete for absorption.
- Loose stools are the usual sign of too much, or of the wrong form.
Who should check with a doctor first
- Anyone with kidney disease. Impaired kidneys cannot clear excess magnesium.
- Anyone taking antibiotics, bisphosphonates, diuretics or heart medication.
- Anyone pregnant or breastfeeding.
This article is general information from the Orbit Naturals formulation team, not medical advice. Our supplements are food supplements, not medicines, and are not intended to diagnose, treat, cure or prevent any disease.
