Magnesium Citrate vs Glycinate: Which Form, and How Much?
Two bottles sit next to each other. Both say 500 mg. One is magnesium citrate, one is magnesium glycinate. They do not contain the same amount of magnesium, they do not behave the same way in your gut, and the number on the front tells you almost nothing about either.
This is the practical comparison, with a calculator so you can check any bottle yourself.
The calculator
Enter what the label says. It will tell you what you are actually taking.
Your label says 500 mg. You are taking 70 mg of magnesium.
Within both supplemental upper limits.
| Form | Elemental % | You would get |
|---|
This is a unit-conversion tool, not medical advice. It does not account for the magnesium in your food, and it says nothing about how much you absorb.
What actually differs
Magnesium is never sold on its own. It is always bonded to a partner molecule, and that partner decides three things: how much magnesium you get per milligram of powder, how the compound behaves in your gut, and what it costs to manufacture. Everything else in the marketing is downstream of those three.
Elemental content
Citrate is roughly 16% elemental magnesium. Glycinate is roughly 14% in its pure anhydrous form, and lower once bound water is included — which is why a fully reacted bisglycinate often lands nearer 11%. The gap between the two is real but small. Neither is remotely close to oxide at 60%.
The practical consequence is capsule count. A glycinate product hitting a meaningful elemental dose needs more powder, which means bigger capsules or more of them. A brand that promises a high dose in one small capsule is either using oxide, buffering with oxide, or being imprecise. We wrote about how to spot that in elemental vs total magnesium.
Tolerability
This is the difference that people actually notice, and it runs the other way to elemental content.
Citrate is an osmotic — it draws water into the bowel. At low doses this passes unnoticed. At higher doses it loosens stools, which is precisely why magnesium citrate is sold as a laxative preparation in pharmacies. That is not a defect; it is the mechanism, and it is useful if constipation is the thing you are trying to address.
Glycinate is consistently the gentlest of the common oral forms. Bound to the amino acid glycine rather than an organic acid, it lacks the osmotic pull. If you have tried magnesium before and stopped because of your gut, the form is the most likely culprit, and glycinate is the usual answer.
Absorption
Here is where we part company with most comparison articles.
The claim that glycinate is dramatically better absorbed than citrate is not well supported. Comparative human data across magnesium forms is limited, the trials that exist are small, and citrate performs respectably in most of them. What is reasonably well established is the broader pattern: organic and chelated forms — citrate, malate, glycinate, taurate — are absorbed more reliably than inorganic oxide, which sits clearly at the bottom.
Within the well-absorbed group, the differences are modest and the marketing is loud. Choose on tolerability and consistency, not on absorption percentages that no one can substantiate.
Where the other forms sit
Malate, at about 15%, is chemically close to citrate and generally well tolerated. It is often positioned around energy and muscle, though the evidence base is thinner than for the more studied forms.
Oxide, at about 60%, delivers the most magnesium per milligram and the least into your bloodstream. It is cheap and poorly absorbed, and it is the form most likely to send you to the bathroom. Its presence in a blend is usually a cost decision.
L-threonate, at about 8%, has the lowest elemental content of the common forms and the highest price. Its trial precedent is in cognition rather than sleep or muscle.
Taurate, around 9%, is bound to taurine and is generally well tolerated, with a smaller literature behind it than citrate or glycinate.
So which one
The honest version is that this decision matters less than the two questions on either side of it: whether you actually need to supplement, and whether you will take it consistently.
That said:
- Constipation is the problem you are solving. Citrate, and the osmotic effect is the point rather than a side effect.
- You want a daily maintenance dose and a settled stomach. Glycinate. This is the majority case.
- You have tried magnesium and it upset your gut. Switch form before you abandon the mineral. Very often that is the whole problem.
- You are choosing on price per milligram of elemental magnesium. Oxide wins on paper and loses in practice.
How much to take is a separate question, and a more consequential one — we covered it in how much magnesium glycinate should you take. If you take other supplements alongside it, what supplements should not be taken together covers the genuine conflicts.
Where our label lands
Zororra Magnesium Glycinate provides 275 mg of elemental magnesium from 2,500 mg of magnesium bisglycinate, across three capsules. That works out at 11% — the honest figure for a fully reacted, hydrated bisglycinate, and the reason it takes three capsules rather than one.
Run those numbers through the calculator above. Then run a competitor's. The gap between what a label announces and what it delivers is the entire reason this brand exists.
Single active. No proprietary blend. GMP-certified manufacturing, third-party tested every batch.
Frequently asked
Magnesium citrate or glycinate — which is better?
Neither is universally better. Citrate has slightly higher elemental content at about 16% versus 14%, and has an osmotic effect that loosens stools, making it the conventional choice when constipation is the concern. Glycinate is the gentlest common form and the usual choice for daily maintenance. Absorption differences between the two are smaller than marketing suggests.
Is magnesium glycinate better absorbed than citrate?
Comparative human data across magnesium forms is limited and the differences between well-absorbed forms are modest. Both are absorbed considerably better than magnesium oxide. Choose on tolerability rather than on absorption claims.
Magnesium malate vs glycinate?
Malate is about 15% elemental and glycinate about 14%, and both are generally well tolerated. Malate is more often positioned around energy and muscle, glycinate around evening use and gut comfort. The evidence base for glycinate is larger.
Why does magnesium citrate cause diarrhoea?
Citrate draws water into the bowel through osmosis. At the doses used in supplements this is usually mild; at higher doses it is pronounced, which is why citrate preparations are sold as laxatives. Glycinate does not share this mechanism.
Which form of magnesium has the most elemental magnesium?
Magnesium oxide, at roughly 60% by weight — far more than citrate at 16% or glycinate at 14%. Oxide is also the least well absorbed of the common forms, so the highest elemental percentage does not translate to the most magnesium reaching you.
Can I take magnesium citrate and glycinate together?
There is no conflict between them, but the elemental magnesium adds up across both and counts against the same supplemental upper limit. Add the two figures together using the calculator above rather than treating them separately.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
This article is for general information and is not medical advice. Speak to a doctor or pharmacist before starting a supplement, particularly if you take regular medication, have reduced kidney function, or are pregnant or breastfeeding.