Types of Magnesium: Which Form Is Best for You?

Short answer: for most people the best all round choice is magnesium glycinate, because it is gentle, well absorbed and easy to take every day. Choose citrate if your digestion is sluggish, malate if you want it in the morning, taurate alongside a heart healthy routine, and a blend if you would rather not pick at all. What matters far more than the form is how much elemental magnesium you actually get, and that number is rarely the one on the front of the bottle.

The seven types of magnesium, compared

Notice the third column. A form with a high percentage on paper is not automatically the better buy, because absorption matters as much as content. Magnesium oxide is the clearest example: plenty of magnesium, very little of it usable.

Why the form matters at all

Magnesium never arrives on its own. It is a mineral bound to a carrier, and that carrier decides three things: how gently the supplement passes through your gut, how much elemental magnesium you get per capsule, and what else you are taking in alongside it, whether that is glycine, taurine or malic acid.

The nutrient itself does the same job in every form. Magnesium contributes to a reduction of tiredness and fatigue, to normal muscle function, to the normal functioning of the nervous system, to normal psychological function and to the maintenance of normal bones and teeth. Those are authorised statements in the Great Britain nutrition and health claims register and they apply whichever bottle you pick.

So the question is not "which form is strongest". It is "which form will I actually take every day without my stomach complaining".

Magnesium glycinate and bisglycinate

Magnesium bound to glycine. The gentlest form on digestion, which is why it is the one most people settle on for daily use, and the one that suits an evening routine.

Glycine is not just a carrier. Your body uses it in collagen, in the production of glutathione and as a signalling molecule in the nervous system, so you are taking in something useful alongside the mineral.

On our labels: Magnesium Glycinate 650 mg gives 130 mg of elemental magnesium per capsule, which is 34.7% of the daily reference value. Magnesium Bisglycinate 600 mg gives 84.6 mg, or 22.6%. Same idea, two strengths.

Magnesium citrate

Magnesium bound to citric acid. It dissolves readily, which is why it turns up in powders and effervescent drinks, and why it has the longest track record in absorption research. In a randomised double blind study by Walker and colleagues (2003), citrate came out ahead of an amino acid chelate and of oxide over 60 days.

That same solubility gives citrate its reputation. It pulls water into the bowel, which is helpful if your digestion is slow and unhelpful if it is not. Take it with a meal.

Magnesium Citrate 600 mg gives 96 mg of elemental magnesium per capsule, 25.6% of the reference value. If you are weighing these two up specifically, we compared them in detail in magnesium glycinate vs citrate.

Magnesium malate

Magnesium bound to malic acid, a compound that appears naturally in apples and in the body's own energy cycle. It is gentle on digestion and carries the same 20% elemental magnesium as glycinate, which makes it an efficient everyday option.

People tend to take malate earlier in the day, largely because of its association with energy metabolism. The honest position: magnesium contributes to normal energy yielding metabolism in every form, and the case for malate specifically is based more on the role of malic acid than on head to head trials.

Magnesium Malate 650 mg gives 130 mg of elemental magnesium per capsule.

Magnesium taurate

Magnesium bound to taurine, an amino acid found in high concentrations in the heart and in muscle tissue. This is the form people choose when they want the taurine as much as the magnesium.

Be aware of the trade off. Taurate carries only about 9% elemental magnesium, so Magnesium Taurate 500 mg gives 44.5 mg per capsule, 11.9% of the reference value. It is a poor choice as your only source of magnesium and a sensible one as part of a wider routine or inside a blend.

Magnesium L-threonate

The newest form, and the one with the most interesting research. It was developed at MIT, and in the original study published in Neuron in 2010 it raised magnesium levels in the brain and improved learning and memory measures.

Two caveats worth stating plainly. That study was in rats, and human evidence remains limited. Threonate also carries very little elemental magnesium, around 8%, so it is a supplement you take for the form itself, not to close a dietary gap.

We use magnesium L-threonate inside Dream Flow Complex, alongside L-theanine, lemon balm and GABA.

The forms to be careful with

Magnesium oxide looks impressive on a label, at around 60% elemental magnesium, but very little of it is absorbed. It is cheap, it fills a lot of supermarket tablets and it is the usual reason people conclude that "magnesium upsets my stomach". We do not use it.

Magnesium sulfate is Epsom salts. Fine in a bath, not something to swallow casually.

Aspartate and orotate appear in sports formulas. Both are absorbed reasonably well, and neither has a strong enough case to choose over the forms above.

Should you take a blend?

Blends exist for a practical reason. Each form has a strength and a weakness, so combining them spreads the load: one gentle form for the bulk of the magnesium, one for digestion, one for the amino acid it carries.

Ours, so you can compare like with like:

• Magnesium Complex 630 mg: glycinate, taurate and malate, giving 99.5 mg of elemental magnesium per capsule (26.5% of the reference value).
• Triple Magnesium 500 mg: bisglycinate, citrate and taurate, giving 106 mg per capsule (28.3%).
• Magnesium 3-in-1: glycinate, malate and citrate, giving 380 mg across three capsules, which is 101.3% of the reference value.

A blend is the sensible default if you are not sure. A single form is better if you have a specific reason, for example a stomach that reacts to citrate.

How to choose, by what you actually want

How much magnesium do you need?

The NHS puts the requirement at 300 mg a day for men and 270 mg for women aged 19 to 64, and notes that 400 mg or less a day from supplements is unlikely to cause harm.

Food does most of the work: wholegrains, nuts, seeds, beans, dark leafy greens. A supplement tops up the difference rather than replacing any of that.

How to read a magnesium label

This is the part most people get wrong, and it costs money.

The big number on the front is the weight of the whole compound. The number that matters is the elemental magnesium, usually in the small print. A 650 mg glycinate capsule contains 130 mg of magnesium. A 500 mg taurate capsule contains 44.5 mg. Both labels are honest, and they are three times apart on the thing you are buying.

Check three things before you buy: elemental magnesium per capsule, the serving size the brand recommends, and whether there are fillers and binders in the ingredients list.

Can you take two forms together?

Yes. They are all sources of the same mineral, so the only number to watch is your total elemental magnesium across everything you take. Some people split them deliberately: malate or citrate earlier in the day, glycinate in the evening.

If your stools loosen, that is the signal to reduce the dose, whatever form you are using.

Frequently asked questions

Which type of magnesium is best?

For most people, glycinate. It is gentle, well absorbed and easy to keep taking, and consistency is what closes a dietary gap. Citrate is the better pick if digestion is sluggish, and a blend is the sensible option if you would rather not choose.

What is the difference between magnesium glycinate and magnesium citrate?

What the magnesium is bound to. Glycinate is bound to glycine and is the gentlest form on digestion. Citrate is bound to citric acid, dissolves readily and draws water into the bowel. Glycinate also carries slightly more elemental magnesium per gram.

Which form of magnesium is best absorbed?

Glycinate, citrate, malate and taurate are all well absorbed. Oxide is the one to avoid. A review of intestinal magnesium absorption by Schuchardt and Hahn (2017) explains why solubility and the route through the gut wall matter more than the headline percentage.

Which magnesium is best for sleep?

Glycinate is the form most people take in the evening. The evidence is promising rather than settled: a 2021 systematic review by Mah and Pitre pooled three small trials in older adults with insomnia and found modest effects from low quality evidence.

Is magnesium oxide any good?

It contains a lot of magnesium and delivers very little of it. If a cheap magnesium has upset your stomach in the past, check the label, because oxide is the usual culprit.

Are magnesium supplements vegan?

The mineral itself is, but the capsule shell is not always. Ours use plant derived HPMC, with no fillers and no binders, and every batch is tested.

When should I take magnesium?

Whenever you will remember it. Citrate is best taken with a meal, glycinate suits the evening, malate tends to be taken earlier in the day. Splitting a larger dose across the day is easier on the gut than taking it all at once.

The Mother Nature take

Start with glycinate if you want one bottle and no decisions. Take a blend if you want the strengths of several forms without managing three bottles. Move to citrate only if your digestion needs the nudge, and treat taurate and L-threonate as additions to a routine rather than the foundation of one.

Then ignore the front of the label and read the small print. Elemental magnesium per capsule is the number you are actually buying.

This article is for general information and is not medical advice. Food supplements should not replace a varied, balanced diet and a healthy lifestyle. If you are pregnant, breastfeeding, taking prescription medication or managing a health condition, speak to your doctor or pharmacist before starting a new supplement.

Sources

• NHS. Vitamins and minerals: others, magnesium section.
• Schuchardt JP, Hahn A. Intestinal absorption and factors influencing bioavailability of magnesium: an update. Current Nutrition and Food Science, 2017.
• Walker AF, Marakis G, Christie S, Byng M. Mg citrate found more bioavailable than other Mg preparations in a randomised, double blind study. Magnesium Research, 2003.
• Slutsky I, Abumaria N, Wu LJ, et al. Enhancement of learning and memory by elevating brain magnesium. Neuron, 2010. Animal study.
• Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults: a systematic review and meta analysis. BMC Complementary Medicine and Therapies, 2021.
• Department of Health and Social Care. Great Britain nutrition and health claims register.