Magnesium malate is about 15% magnesium by formula weight and magnesium bisglycinate about 14%, so the two carry nearly the same mineral per gram and need almost the same amount of powder. Malate is sold on its partner, malic acid, a step in the cycle cells use to release energy from food. No human trial we found has compared the two forms, and the ranking that puts malate first comes from rats.
That makes this the least lopsided comparison in the magnesium aisle on the arithmetic and one of the most lopsided on the marketing. The numbers are close. The stories told about the two partner molecules are not, and malate's is the one built on a textbook diagram rather than on a trial.
What is magnesium malate?
Magnesium malate is magnesium bound to malic acid, the acid that makes apples sour. By formula weight the pure, dry compound is about 15% magnesium, a shade more than bisglycinate's 14% and a shade less than citrate's 16%. It is sold mainly on its partner: malate is one of the intermediates of the citric acid cycle, the pathway cells use to release energy from food, and that biochemistry is the whole of the form's marketing story.
The biochemistry is real. Malate sits between fumarate and oxaloacetate in the cycle, and every cell that runs the cycle makes and uses its own, continuously. What has not been shown is the step the label invites a buyer to take, from "malate is in the energy cycle" to "a capsule of malate adds to it." Those are different claims, and only the first is in a textbook.
What is the difference between magnesium malate and magnesium glycinate?
The partner molecule, and the story told about it. Malate pairs magnesium with malic acid; glycinate holds it between two molecules of the amino acid glycine. At about 15% and 14% magnesium by formula weight they carry nearly the same mineral per gram, so a dose takes almost the same amount of powder. Glycinate is sold on tolerability, malate on its partner's place in energy metabolism, and neither claim has a human head-to-head trial behind it.
Both are organic salts, which is the word the aisle reaches for when it means better absorbed. The word guarantees less than it suggests. In Firoz and Graber's study of four commercial products (Magnesium Research, 2001), the inorganic salt, chloride, was absorbed as well as the organic lactate and aspartate, and the authors concluded that an inorganic salt can be as bioavailable as an organic one, depending on the preparation. What matters is how readily a salt dissolves and lets go of its magnesium, not which side of the organic line it sits on. Chloride's own case is in chloride against glycinate.
How much elemental magnesium is in magnesium malate?
About 15% of the pure, dry compound by formula weight, so 1,000 mg of magnesium malate carries roughly 150 mg of magnesium. That is a ceiling, not a laboratory figure: a hydrated raw material carries less, and malate is sold as more than one salt. The elemental figure in the Supplement Facts panel is the only number that tells you how much magnesium a particular capsule holds, whatever the form name on the front says.
Run forward to a real dose, the difference between the two forms is about 180 mg of powder. The reference amount below is 275 mg of magnesium because that is the elemental figure printed on Night Work's label. It is a label figure, and nothing in this table was measured.
| Form | Magnesium by weight | Compound needed for 275 mg of magnesium |
|---|---|---|
| Magnesium citrate | about 16% | about 1,700 mg |
| Magnesium malate | about 15% | about 1,770 mg |
| Magnesium bisglycinate | about 14% | about 1,950 mg |
| Night Work, by its label | 11% (275 ÷ 2,500) | 2,500 mg of magnesium glycinate |
Each compound weight is 275 divided by the unrounded magnesium fraction behind the percentage beside it, rounded to the nearest 10 mg; the formula weights are the PubChem values the rest of this Journal prints. Our own panel lands under the bisglycinate ceiling, as a real raw material usually does. A malate panel that divides out well above 15% is worth a second look: it may be a different malate salt, a blend, or a label that does not add up. The same division across every common form is in supplement forms compared, and the method in how to read an elemental magnesium label.
Is magnesium malate absorbed better than glycinate?
Nobody has shown it in people: we found no human trial comparing the two. The ranking that puts malate first comes from rats. In Uysal and colleagues' 2019 study, a single dose of magnesium malate produced the largest area under the serum magnesium curve of five compounds. The NIH Office of Dietary Supplements' list of forms small human studies found better absorbed names aspartate, citrate, lactate and chloride, and neither malate nor glycinate.
The rat study deserves its details, because it is the source of most of what is said about malate online. Uysal and colleagues (Biological Trace Element Research, 2019) gave Sprague-Dawley rats one dose of magnesium, scaled to 400 mg per 70 kg, as sulfate, oxide, acetyl taurate, citrate or malate, and tracked serum magnesium over the following hours. Malate gave the largest area under the curve. Oxide and citrate came out lowest against the control group.
That last line is the reason not to transfer the ranking to people. In humans, citrate is the form with the best record in the small trials that exist: it produced the highest mean serum magnesium of four arms over 60 days in Walker and colleagues' trial (Magnesium Research, 2003), and it raised plasma magnesium at four hours in Pajuelo and colleagues' 2024 crossover. A ranking that puts citrate near the bottom has measured a rat, not predicted a person. The same group's mouse study (Ates and colleagues, Biological Trace Element Research, 2019) set malate against glycinate, citrate and acetyl taurate directly; its abstract singles out acetyl taurate, which raised brain magnesium at every dose, and citrate, which raised muscle and brain magnesium, and reports no finding for malate or glycinate in particular.
Glycinate's human record is thin too, and it is printed here because we sell glycinate. In the 2024 crossover, 40 healthy adults took 375 mg of magnesium as each of four forms, and bisglycinate produced no significant rise in plasma magnesium at one, four or six hours; the sponsor sold a competing ingredient, and six hours of plasma is not magnesium status. An older trial, Schuette and colleagues (JPEN, 1994), compared glycinate with oxide in 12 patients with ileal resection and found the two tied overall, 23.5% against 22.8%. The full account of both is in magnesium glycinate side effects.
Does the malic acid in magnesium malate do anything?
Not that any trial we found has shown in people who train. Malate is an intermediate of the citric acid cycle, which cells run continuously on malate they make themselves, so the step from that biochemistry to a capsule that adds energy is a story, not a measurement. The magnesium itself is the same mineral whichever partner carries it, and glycinate, citrate and every other form supply it too.
Whatever magnesium does belongs to the mineral, not to its partner. Of the table's 1,770 mg of magnesium malate, about 1,500 mg is the malate rather than the magnesium, and we found no trial in people who train that measured what, if anything, that adds. Without one, the partner molecule is not a reason to choose one magnesium salt over another.
Which should you take, magnesium malate or glycinate?
Whichever your gut tolerates at the elemental dose you need, counted against the 350 mg daily ceiling on supplemental magnesium. On magnesium per gram they are close, about 15% against 14%. On human evidence both are thin, and neither has been compared with the other. Buy malate for the malate and you are paying for a mechanism no human trial has examined; buy either for its elemental figure and the choice comes down to tolerance.
The checks are the same for both, and for ours:
- Find the elemental figure in the panel and divide it by the compound weight. Up to about 15% fits a malate, up to about 14% a bisglycinate; a figure above the ceiling points to a different salt or a blend. Panel terms are in the supplement label glossary.
- Check that magnesium is not inside a proprietary blend with one combined weight. If it is, none of the arithmetic on this page can be run.
- Add every supplemental source in the day against 350 mg, which counts supplements and medicines and not food. The reasoning behind that line is in can you take too much magnesium, and how much food then has to supply is in how much magnesium per day.
The same comparison runs against citrate and, for a form sold on a mechanism in the same way, threonate; the buying procedure end to end is in how to choose a magnesium supplement.
What the research does not show
No human trial has compared magnesium malate with magnesium glycinate on absorption or on magnesium status, and we found no trial of the malate form in men who train. The evidence that ranks malate highly is a single-dose study in rats, and the one study that put malate and glycinate side by side used mice. Rodents absorb and excrete magnesium on their own terms, and doses scaled per 70 kg do not turn a rat into a person.
The malic acid mechanism has not been measured in the sense that matters: no trial we found gave people magnesium malate against another magnesium form at the same elemental dose and looked for a difference that could be pinned on the malate. Until one does, the energy story belongs to the biochemistry textbook and not to the capsule.
Glycinate's record carries its own limits, set out above: one 12-patient trial against oxide, and one single-dose crossover in which it did not raise plasma magnesium. Neither form has a human record strong enough to quote a percentage advantage, and this page quotes none. What magnesium does in the body belongs to the mineral, whichever salt carries it. Magnesium supports normal muscle function.* The evidence form by form is collected in the magnesium research summary.
*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.
Where Night Work sits
Night Work is magnesium glycinate in capsules: by its label, 275 mg of elemental magnesium from 2,500 mg of magnesium glycinate per three-capsule serving, 30 servings. It is the only supplemental magnesium in the TARE range, so the label's 275 mg is the whole of the range's supplemental total, 75 mg under the 350 mg tolerable upper intake level. TARE sells no malate, so this page has nothing to sell against it. What is and is not measured for Night Work is set out on Testing & Certification.
Sources
- NIH Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals (updated 6 January 2026). NIH Office of Dietary Supplements
- Uysal N, Kizildag S, Yuce Z, et al. Biol Trace Elem Res 2019;187(1):128-136. PubMed 29679349
- Ates M, Kizildag S, Yuksel O, et al. Biol Trace Elem Res 2019;192(2):244-251. PubMed 30761462
- Pajuelo D, Meissner JM, Negra T, et al. Nutrients 2024;16(24):4367. PubMed 39770988
- Walker AF, Marakis G, Christie S, Byng M. Magnes Res 2003;16(3):183-191. PubMed 14596323
- Schuette SA, Lashner BA, Janghorbani M. JPEN J Parenter Enteral Nutr 1994;18(5):430-435. PubMed 7815675
- Firoz M, Graber M. Magnes Res 2001;14(4):257-262. PubMed 11794633