You've decided to start taking magnesium. Maybe you can't switch off at night, your mind races when your head hits the pillow, or your calves cramp after the gym. Then you hit the wall everyone hits: there are loads of different types, and you're stuck on magnesium glycinate vs citrate with no idea which one actually fits your goal.
If it helps, most people start even further back. You grabbed a generic magnesium tub from Boots or Holland & Barrett, didn't feel much (or felt a sudden need for the loo), and assumed magnesium "just doesn't work" for you. It usually does. You probably had the wrong form.
Let's break it down simply, match each form to a real goal, and answer the question most guides skip: do you actually need to choose at all?
1. Magnesium glycinate vs citrate: the quick answer
The two-second version: choose glycinate if your goal is sleep, calm and a gentle effect on your stomach. Choose citrate if your goal is digestion, regularity and post-exercise cramps, and you don't mind (or actively want) its mild laxative effect.
That single line covers most decisions. But if you want both jobs done at once, the easiest route is a multi-form magnesium that combines several types in one tablet, like Vitastrong Magnesium Complex, which blends five forms of magnesium. More on whether that's right for you below.
2. Why the form matters (and why "magnesium doesn't work for me" is usually wrong)
Magnesium is always bound to something else an amino acid, a salt, an acid. That partner molecule changes how gently it sits in your gut and how well your body takes it up. Same mineral, very different experience.
This is why the "magnesium doesn't work for me" story is so common and so misleading. Most people who say it tried cheap magnesium oxide or citrate, got loose stools or felt nothing, and gave up. Switching form is often what changes the outcome.
So if you wrote magnesium off especially if you're peri or post-menopausal and desperate for a proper night's sleep it was probably the form, not the mineral. Magnesium contributes to a reduction of tiredness and fatigue and to normal muscle function, but only if you're taking a form you can actually tolerate and absorb.
3. Magnesium glycinate: best for sleep, calm and sensitive stomachs
Glycinate is magnesium bound to glycine, a calming amino acid. It's the form people reach for when they want to wind down, quieten a busy mind and finally sleep without the 3am wake-up.
It's also the gentlest on digestion, so it's the go-to if cheap magnesium has ever sent you running to the bathroom. That makes it a strong pick if your main reasons for taking magnesium are better sleep or a calmer, less wired evening. (If sleep is your main goal, it's worth reading our guide to the best vitamins for tiredness and fatigue too.)
- Best for: sleep, calm and restless evenings
- Gentle on the stomach low risk of the laxative effect
- Magnesium contributes to normal psychological function and to a reduction of tiredness and fatigue
4. Magnesium citrate: best for digestion, regularity and cramps
Citrate is magnesium bound to citric acid. It's well absorbed and, importantly, it draws water into the gut which is exactly why it has a mild laxative effect.
Let's be honest about that, because it's the single most decisive difference. If you're sluggish or irregular, that effect is a feature. If you're not, it can be a deal-breaker. So yes to answer the question everyone asks, magnesium citrate can make you go to the toilet, and for some people that's the whole point.
- Best for: digestion, regularity and topping up magnesium quickly
- Often chosen by people who want to support muscle function after exercise (magnesium contributes to normal muscle function)
- The laxative effect is a feature for some and a downside for others choose with that in mind
For muscle cramps after training, both forms have a place, since magnesium contributes to normal muscle function. Citrate suits those who also want digestive support; glycinate suits those who want muscle support without the toilet trips.
5. Glycinate vs citrate at a glance (and the elemental magnesium number that matters)
Quick comparison:
- Glycinate — sleep, calm, sensitive stomachs. Very gentle. Take in the evening.
- Citrate — digestion, regularity, cramps. Well absorbed, mild laxative effect. Often taken earlier in the day.
Now the bit no one explains: elemental magnesium. The big number on the label say 375mg or 1450mg is usually the weight of the whole compound, not the actual magnesium your body gets. The "elemental" figure is the real dose. Different forms carry different percentages, so always check the elemental magnesium content per serving rather than the headline number. It's the single most useful label-reading skill you can have.
6. Which magnesium is right for you? Choose by your goal
Forget the chemistry and start with your goal:
- Can't switch off at night / a busy, racing mind → glycinate
- Sluggish or irregular digestion → citrate
- Cramps after the gym → either; citrate if you also want digestive support
- Sensitive stomach, reacted badly to cheap magnesium before → glycinate
- Focused on sleep and recovery from training → glycinate, or a magnesium blend with zinc and vitamin B6
If you can see yourself in two or three of those lines at once which most people can a single multi-form product can be a sensible, low-fuss option, since it covers several forms in one tablet rather than asking you to bet on one. And if your focus is training and recovery specifically, Vitastrong ZMA pairs magnesium with zinc and vitamin B6 a popular evening choice for active people.
7. Can you take magnesium glycinate and citrate together?
Yes, the two forms aren't in conflict, and plenty of people do exactly that citrate earlier in the day for digestion, glycinate in the evening for sleep. The thing to watch is your total intake, not the combination itself.
Keep an eye on the overall amount of magnesium across everything you take. UK guidance suggests an upper level of 350mg of supplemental magnesium a day (on top of what you get from food) to avoid the laxative effect. Always follow the dose on the product label, and speak to a healthcare professional if you want personalised advice on what's right for you.
8. Best time to take each form, and the realistic expectation
Timing is simple once you know each form's job:
- Glycinate — evening, 30–60 minutes before bed, to support winding down
- Citrate — earlier in the day, often with food, given its effect on digestion
- A complex — whenever suits you, commonly in the evening
Be realistic, too. Magnesium contributes to a reduction of tiredness and fatigue and to normal psychological function, which many people find supportive as part of an evening routine, but it isn't a magic switch, and it won't fix poor sleep habits on its own. Give any form a consistent run of a few weeks rather than judging it after one night.
The bottom line on magnesium glycinate vs citrate: it's less about chemistry and more about your goal. Glycinate for sleep and calm, citrate for digestion and regularity and if you'd rather not pick, a multi-form option like Vitastrong Magnesium Complex covers several forms in one. If magnesium once "didn't work" for you, it was most likely the wrong form rather than the mineral itself.
9. FAQs: magnesium glycinate vs citrate
Is magnesium glycinate or citrate better for sleep?
Glycinate is usually preferred for sleep and calm thanks to its soothing glycine partner and its gentleness on the stomach.
Does magnesium citrate make you go to the toilet?
It can. Citrate draws water into the gut and has a mild laxative effect useful if you want regularity, less ideal if you don't.
Is magnesium glycinate gentle on the stomach?
Yes, it's the form most often recommended for sensitive stomachs and people who reacted badly to cheaper magnesium.
Can you buy magnesium glycinate at Boots or Holland & Barrett?
Availability varies on the high street, and Boots in particular can be patchy on specific forms. Buying online direct means you can check exactly which forms and how much elemental magnesium you're getting.
Why does magnesium give me diarrhoea?
Usually it's the form (oxide or citrate) or the dose. Switching to glycinate and staying within sensible limits typically resolves it.
Supplements should complement a balanced diet and a healthy lifestyle, not replace them. If you are pregnant, breastfeeding, taking medication or have a medical condition, consult a healthcare professional before starting any new supplement.