Magnesium Glycinate vs Citrate: Which One Does Your Body Really Need?

Short answer: choose magnesium glycinate if you want a daily magnesium that is gentle on your stomach and easy to take in the evening, and choose magnesium citrate if you also want a form that keeps things moving in your digestive system. Both are well absorbed. The real difference is how they behave in your gut and how much elemental magnesium you get per capsule.

Magnesium glycinate vs citrate at a glance

	Magnesium glycinate	Magnesium citrate
Bound to	Glycine, an amino acid	Citric acid
Elemental magnesium	About 20% of the compound. Our capsules give 130 mg per capsule (34.7% NRV)	About 16% of the compound. Our capsules give 96 mg per capsule (25.6% NRV)
Effect on the bowel	Mild. Usually the easiest form for sensitive stomachs	Stronger osmotic pull, which draws water into the bowel
Typical reason people choose it	Everyday top up, evening routine, muscle function, tiredness	Everyday top up when digestion feels sluggish
Best taken	Any time, food optional. Many people prefer the evening	With a meal, plus a large glass of water
Taste in powder form	Mild, slightly sweet	Sharp and sour

Neither form is "better" in the abstract. They are two answers to two different questions, and the rest of this guide shows you which question you are actually asking.

What is magnesium glycinate?

Magnesium glycinate (also sold as magnesium bisglycinate) is magnesium bound to glycine, one of the smallest amino acids in the body. That pairing matters for two reasons.

First, the chelated structure travels through the gut wall differently from a simple magnesium salt, which is why this form is usually described as gentle. Second, you are also taking in glycine, which the body uses in collagen, in the production of glutathione and as a signalling molecule in the nervous system.

In practice, people choose glycinate when they want magnesium every day without any effect on their digestion, and when they take it in the evening as part of a wind down routine.

Magnesium itself contributes to normal muscle function, to normal functioning of the nervous system, to normal psychological function and to a reduction of tiredness and fatigue. Those are authorised statements in the Great Britain nutrition and health claims register, and they apply to magnesium as a nutrient, whichever form you choose.

Our Magnesium Glycinate 650 mg capsules give 130 mg of elemental magnesium per capsule, with no fillers, no binders and a plant based HPMC shell. If you prefer a slightly smaller daily dose, Magnesium Bisglycinate 600 mg is the same idea in a lower strength.

What is magnesium citrate?

Magnesium citrate is magnesium bound to citric acid. It dissolves readily, which is why it appears in so many powders and effervescent drinks, and why it has a long track record in research on absorption.

The same solubility explains its reputation. Citrate has a stronger osmotic effect than glycinate, so at higher doses it pulls water into the bowel. For some people that is exactly the point. For others it is a reason to take it with a meal, or to pick glycinate instead.

Citrate also delivers slightly less elemental magnesium per gram of compound than glycinate, so read the label rather than the number on the front of the bottle. A "600 mg" citrate capsule and a "650 mg" glycinate capsule are not the same amount of magnesium.

Our Magnesium Citrate 600 mg capsules give 96 mg of elemental magnesium per capsule and are designed to be taken during a meal.

Which one absorbs better?

This is where most comparison articles overreach, so here is the honest version.

Both glycinate and citrate are absorbed well. Both are absorbed better than magnesium oxide, the cheap form that fills a lot of supermarket tablets. A review of intestinal magnesium absorption by Schuchardt and Hahn (2017) explains why: magnesium crosses the gut wall through both a passive route and an active channel, and solubility is one of the factors that influences how much gets through.

Head to head, the evidence is thinner than the marketing suggests. In a randomised double blind study by Walker and colleagues (2003), 46 adults took 300 mg of elemental magnesium a day for 60 days as citrate, as an amino acid chelate or as oxide. Citrate came out ahead on the measures used in that trial.

One study on one set of markers is not the last word, and absorption in a lab is not the same as how a supplement feels in real life. For most people the practical differences below matter far more than a few percentage points of bioavailability.

How to choose: four common situations

You want a daily magnesium and your stomach is sensitive

Choose glycinate. It is the form least likely to loosen your stools, which is the single most common reason people give up on magnesium.

Your digestion feels sluggish

Citrate is the more sensible pick, because the osmotic effect that bothers some people is useful to you. Take it with a meal and a large glass of water. If constipation is persistent or painful, speak to your GP or pharmacist rather than self treating with supplements.

You are taking magnesium in the evening

Glycinate is the usual choice, and it is the form we use in our sleep focused formulas. The evidence on magnesium and sleep is promising but still limited: 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. Useful context, not a promise.

If your goal is an evening routine rather than a single mineral, Dream Flow Complex combines magnesium L-threonate with L-theanine, lemon balm and GABA. Our guide to four supplements that actually help you sleep goes through the options.

You train hard or get muscle cramps

Either form works, since magnesium contributes to normal muscle function whichever way it is bound. Pick on tolerance: glycinate if you take it daily and in larger amounts, citrate if you take it with meals and your gut is happy with it.

Can you take magnesium glycinate and citrate together?

Yes. They are both simply sources of the same mineral, so taking one of each does not double anything except your magnesium intake, which is the number you need to watch.

Some people deliberately split the two: glycinate in the evening, citrate with a meal earlier in the day. If you would rather not manage two bottles, Triple Magnesium 500 mg does the blending for you with bisglycinate, citrate and taurate in one capsule.

How much magnesium do you actually need?

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

Two points people miss:

• Count elemental magnesium, not compound weight. Three of our glycinate capsules give 390 mg of elemental magnesium. Three citrate capsules give 288 mg. The labels say 650 mg and 600 mg.
• Food counts too. Wholegrains, nuts, seeds, beans and dark leafy greens all contribute, so a supplement is topping up a diet rather than replacing it.

Take too much of any form and the result is the same: loose stools. That is your signal to reduce the dose, not to push through it.

What about the other forms of magnesium?

Glycinate and citrate are the two most searched, but they are not the only options:

• Magnesium taurate pairs magnesium with taurine.
• Magnesium malate pairs it with malic acid, part of the body's energy cycle.
• Magnesium L-threonate is the form studied for reaching the brain, and it is what we use in Dream Flow Complex.
• Magnesium oxide is cheap, poorly absorbed and easy to avoid.

Frequently asked questions

Is magnesium glycinate or citrate better for sleep?

Glycinate is the form most people take in the evening, because it is gentle enough for a daily habit and it supplies glycine alongside the magnesium. Citrate is not a poor choice, but its stronger effect on the bowel makes it less comfortable close to bedtime for some people.

What is the difference between magnesium glycinate and magnesium citrate?

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

Is magnesium bisglycinate the same as magnesium glycinate?

In practice, yes. "Bisglycinate" describes the chelate precisely, with two glycine molecules bound to one magnesium ion. Labels use the two names interchangeably.

Can I take magnesium citrate every day?

Many people do, usually with a meal. Keep an eye on the total elemental magnesium across everything you take, and remember the NHS guidance that 400 mg or less a day from supplements is unlikely to cause harm. If you are pregnant, breastfeeding or on prescription medication, check with your doctor or pharmacist first.

Which form is best if magnesium upsets my stomach?

Glycinate, taken with food, starting at one capsule a day and building up. If any form still causes discomfort, reduce the dose before you change the form.

Does magnesium glycinate help with stress?

Magnesium contributes to normal psychological function and to the normal functioning of the nervous system, and those contributions apply to every form. Glycinate is simply the form people find easiest to take consistently, and consistency is what closes a dietary gap.

The Mother Nature take

If you want one bottle in the cupboard and you are not sure which to choose, start with glycinate. It suits the widest range of people, it is easy on digestion and it fits an evening routine. Move to citrate if your digestion is on the sluggish side, or take Triple Magnesium if you would rather not pick at all.

Whichever you choose, check two things on the label before you buy: the elemental magnesium per capsule, and the list of what else is in there. Every Mother Nature capsule is made in the UK with no fillers, no binders and a vegan HPMC shell, and every batch is tested.

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.
• 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.