Magnesium Malate: Benefits, Side Effects and Malate vs Glycinate (UK)

What is magnesium malate?

Magnesium malate is magnesium joined to malic acid. Malic acid occurs naturally in apples and many other fruits, and it is also one of the steps in the Krebs cycle, the process your cells use to make energy. That link is why malate is so often sold as the “energy” form of magnesium.

How much magnesium is in magnesium malate?

Labels may list the weight of the whole compound or just the magnesium in it. What counts is the elemental magnesium.

• Magnesium malate (C4H4MgO5) is about 15% magnesium by weight, based on its chemical formula. So 1,000mg of magnesium malate gives roughly 155mg of magnesium.
• Dimagnesium malate carries two magnesium atoms per malate. In the European Food Safety Authority’s assessment, batches averaged about 22% magnesium.

Products vary, so always check the label for the “elemental magnesium” or “of which magnesium” figure, and compare that rather than the headline milligrams. For a full rundown of every form, see our guide to the 12 types of magnesium.

Is magnesium malate well absorbed?

Probably, but human data on malate itself is thin. A PubMed search for “magnesium malate” returns fewer than ten papers, and none is a human trial comparing it with glycinate.

• Animal research: a 2019 rat study of five forms found malate gave the highest blood magnesium over time. But citrate scored poorly in the same study, which doesn’t match human results, so it tells us little about people.
• Human research on other forms: in a 60-day University of Reading trial, organic forms (citrate and an amino acid chelate) were absorbed better than oxide, and oxide did no better than placebo. Malate is also an organic form, which is why it is generally grouped with the well-absorbed types.
• Product quality matters: a Ghent University study tested 15 commercial magnesium supplements and found very wide differences in how well they dissolved and were absorbed in lab tests, so the product itself matters as well as the form.

In practice, the gap between good forms such as malate, glycinate and citrate is smaller than marketing suggests. Taking a form you tolerate, every day, matters more.

Magnesium malate benefits: what the evidence says

Most benefits claimed for malate come from research on magnesium in general, or from theory about malic acid.

Energy and tiredness

iMagnesium contributes to a reduction of tiredness and fatigue and to normal energy-yielding metabolism, whichever form you take. If you feel drained for weeks, see your GP, as tiredness has many possible causes. Our guide to magnesium for energy covers this in more detail.

Fibromyalgia

Malate’s popularity in fibromyalgia communities rests largely on a 1995 pilot study of 24 people taking malic acid and magnesium tablets. In the blinded, fixed-dose phase there was no clear effect versus placebo. Improvements appeared only in a later open-label phase at higher doses, when everyone knew what they were taking.

A 2019 review of the evidence concluded that magnesium and malic acid make little or no difference to pain or low mood in fibromyalgia. If you live with fibromyalgia, work with your GP on a plan.

Muscle aches and cramps

Magnesium contributes to normal muscle function. For cramps, though, a 2020 Cochrane review found magnesium unlikely to give meaningful protection from typical cramps in older adults. See magnesium for cramps and magnesium for muscle pain.

Migraines

iA 2016 meta-analysis found oral magnesium was linked with fewer and less intense migraines, but it looked at magnesium in general, not malate. Talk to your GP if you take migraine medicines, and see magnesium for migraines.

Sleep

Malate is mainly sold as a daytime form, and research on magnesium and sleep in general is mixed: a 2026 systematic review found inconsistent, low-certainty results. For an evening routine, glycinate is the more common pick. See magnesium for sleep.

Magnesium malate vs glycinate, citrate, taurate and oxide

Magnesium malate vs glycinate

Both are gentle forms, but they are not the same thing. Glycinate is bound to the amino acid glycine and is popular in the evening; malate is usually taken earlier in the day. No trials compare the two directly. A simple rule: malate for a daytime top-up, glycinate as part of your wind-down. Read our full magnesium glycinate guide.

Magnesium malate vs citrate

Citrate has the stronger human absorption evidence and a mild laxative effect, which some people want and others don’t. Malate isn’t used as a laxative and is generally described as gentle, although any magnesium can loosen stools at high doses. See magnesium citrate, or our side-by-side guide to glycinate vs citrate vs threonate.

Still unsure? Our best magnesium supplement UK guide explains what to look for.

How much magnesium malate should you take?

The NHS says adults aged 19 to 64 need 300mg of magnesium a day (men) and 270mg a day (women), and that you should be able to get this from a varied diet. If you take supplements, the NHS says 400mg a day or less is unlikely to cause harm.

• Go by the elemental magnesium per serving on the label, not the weight of the whole compound.
• Count the magnesium from all your supplements together, including multivitamins.
• Start lower and build up over a week or two if you have a sensitive stomach.
• Nuts, seeds, beans, wholegrains and leafy greens all add to your total. See foods high in magnesium.

Not sure whether you’re low? These are the signs of magnesium deficiency to look out for.

Best time to take magnesium malate

Many people take malate in the morning or with lunch, because it is marketed as the daytime form. Malic acid isn’t a stimulant, though, and there is no evidence that malate keeps you awake, so take it whenever suits you. Taking it with food, or splitting a larger dose, can help if magnesium upsets your stomach.

If you take medicines such as certain antibiotics or osteoporosis tablets, timing matters more (see below). For timing by goal and form, see the best time to take magnesium.

Side effects and who should check first

Magnesium malate is usually well tolerated. The commonest side effects of any magnesium are diarrhoea, stomach cramps and nausea, mostly at higher doses; the NHS notes that more than 400mg can cause diarrhoea.

iSpeak to your GP or pharmacist before taking magnesium malate if you:

• Have kidney disease. People with kidney problems are more at risk of magnesium building up to unsafe levels in the blood.
• Take certain antibiotics, such as tetracyclines (for example doxycycline) or quinolones (for example ciprofloxacin). Magnesium can bind to them and reduce how much you absorb, so the doses need spacing out.
• Take osteoporosis medicines called bisphosphonates, such as alendronic acid, which can be affected in the same way.
• Take a proton pump inhibitor (such as omeprazole) long term. The MHRA has warned these can lower magnesium levels, so your doctor may want to check them.
• Are pregnant or breastfeeding. Check with your midwife or GP first. We don’t recommend our products during pregnancy or breastfeeding. See magnesium in pregnancy.

Our products are for adults (18+) only. For the full list, read our guide to magnesium side effects.

Why our magnesium uses bisglycinate and citrate

To be clear, our Magnesium Glycinate Sleep Complex doesn’t contain magnesium malate. It is a berry-flavoured drink powder designed for the evening, not a daytime product.

We chose magnesium bisglycinate because it is gentle on the stomach and suits an evening drink, and citrate because it has some of the strongest human absorption data of any form. Together they give 290mg of elemental magnesium per serving, alongside glycine, L-theanine, chamomile, passionflower, hops and oat straw. Magnesium contributes to the normal functioning of the nervous system and to normal psychological function.

If you also take a daytime malate, keep your total from all supplements at 400mg a day or less.

Related guides

• Magnesium taurate: benefits and taurate vs glycinate.
• For the cheapest form and why it’s poorly absorbed, see magnesium oxide.
• Does magnesium make you sleepy in the morning?
• Magnesium powder or tablets: which suits you.
• Our guide to magnesium L-threonate.
• For what the NHS and NICE recommend, see what helps fibromyalgia pain.
• Malate is rarely used as a laxative; if you want to know which forms do make you go, see does magnesium make you poop?
• Malate is often one of several forms in a blend; see magnesium complex benefits and whether a blend is better.
• For another less common form, see magnesium orotate, which gives only about 33mg of magnesium per 500mg capsule.
• Some blends mix malate with glycinate, such as the New Leaf magnesium 4 in 1 complex.
• For how one UK brand labels its malate, see BioCare magnesium malate and the rest of its range.
• Pure Encapsulations sells a citrate/malate capsule in the UK; see Pure Encapsulations magnesium for the label facts.
• Several high street brands sell malate tablets; see New Nordic Magic Magnesium Malate for one label explained.
• If it is the glycine you are after, read how much glycine for sleep the small trials used.
• Not sure how much to take? Our magnesium per day guide covers UK amounts, glycinate label maths and safe limits.

• Malate often appears in blends, such as Nutrition Geeks Magnesium Glycinate 3-in-1 (400mg of malate per serving).

• Malate often appears in blends; Bettervits Magnesium Complex combines it with glycinate and citrate for 225mg of magnesium.