On this page
The verdict
Choose magnesium glycinate if you are taking magnesium in the evening for sleep quality and relaxation, or if cheap magnesium has upset your stomach before. Choose magnesium citrate if you want well-absorbed magnesium for the least money and would not mind a nudge toward regularity. This is not a good-versus-bad matchup: both forms absorb far better than magnesium oxide, which is the form actually worth skipping. The real differences are tolerance and price. Glycinate binds elemental magnesium to glycine, an amino acid that is itself mildly calming and easy on the gut, which is why the form we use is magnesium bisglycinate chelate at 200-400 mg elemental in the evening. Citrate costs roughly half as much per dose and pulls water into the bowel, which is exactly why some people buy it and exactly why others cannot tolerate it above 200 mg.
Magnesium is the most-argued-about supplement form on the internet, and for once the argument is justified. The label says magnesium, but the capsule contains a salt or a chelate, and the compound bolted onto the mineral changes almost everything that matters: how much elemental magnesium you get per capsule, how much of it you absorb, whether it sends you to the bathroom, and what a month costs.
Two camps show up to this question. One wants magnesium for sleep, evening tension, or stress, and got burned by a cheap bottle that caused cramping at 10 p.m. The other wants to raise a chronically low magnesium intake as cheaply as possible and either doesn't mind the bowel effect or is quietly hoping for it. Those are different answers, and most articles refuse to pick one. Below is the version that picks.
Magnesium Glycinate vs Magnesium Citrate, side by side
| Criterion | Magnesium Glycinate | Magnesium Citrate |
|---|---|---|
| Best for | Evening use, sleep quality, everyday stress, sensitive stomachs, higher doses | Budget repletion, morning or with-meal dosing, occasional constipation |
| Absorption | High. Chelated to glycine, absorbed via amino-acid pathways rather than depending on stomach acid | High. One of the better-absorbed organic salts; comparative absorption studies put it near glycinate |
| Elemental magnesium by weight | About 14%, so a 1,000 mg capsule of the chelate delivers roughly 140 mg elemental | About 16%, so slightly more elemental magnesium per gram of compound |
| Evidence base | Moderate. Trials on sleep quality, relaxation, and magnesium repletion; the glycine half has its own sleep literature | Moderate to strong for absorption and bowel regularity; thinner for sleep-specific outcomes |
| Typical dose | 200-400 mg elemental, 1-2 hours before bed | 200-400 mg elemental, usually split and taken with food |
| GI tolerance | Best in class. Loose stools are uncommon at normal doses, which is the whole point of the form | Looser. Many people hit urgency somewhere above 300-400 mg elemental |
| Onset | Sleep and relaxation effects usually within 1-2 weeks; full repletion 4-8 weeks | Bowel effect within hours; repletion on the same 4-8 week timeline |
| Cost per month | Roughly $10-20 at 200-400 mg elemental daily | Roughly $5-12 at the same elemental dose |
| Form we use | Yes, as magnesium bisglycinate chelate, third-party tested | No |
Which one to choose
Choose Magnesium Glycinate if…
- You take magnesium at night for sleep quality or to unwind, and want the glycine side of the molecule working with you rather than a bowel effect working against you.
- Cheap magnesium has given you cramping, urgency, or loose stools before. That is a form problem, not a magnesium problem.
- You need the upper end of the range (300-400 mg elemental) without digestive consequences.
- You are stacking magnesium alongside glycine, L-theanine, or low-dose melatonin and want the most predictable, boring component in the stack.
Choose Magnesium Citrate if…
- Occasional constipation is part of why you are buying magnesium in the first place.
- You are price-sensitive and want genuinely well-absorbed magnesium for the least money per elemental milligram.
- You dose in the morning or with meals, where a mild bowel effect is a non-issue.
- Travel has slowed your digestion down and you want one bottle that covers both mineral intake and regularity.
- You have taken citrate at 200 mg elemental before with no problems, in which case there is no reason to pay more.
Relevant stacks
Frequently asked questions
Magnesium glycinate vs magnesium citrate: which one absorbs better?
Both absorb well, and head-to-head absorption studies do not produce a decisive winner. Citrate carries slightly more elemental magnesium per gram (about 16% versus 14%), while glycinate is tolerated at higher doses, so more of the dose you intend to take actually stays down. Against magnesium oxide, either one is a large upgrade.
Which magnesium is best for sleep?
Glycinate, and not by a small margin in practice. It is the form best tolerated at bedtime doses, and glycine itself has evidence for supporting sleep quality. Take 200-400 mg elemental 1-2 hours before bed. Citrate can work, but a form with a bowel effect is a poor choice for something you swallow right before lying down.
Is magnesium citrate good for occasional constipation?
It is the form most people reach for, because unabsorbed citrate draws water into the bowel osmotically. Practically, 200-400 mg elemental with plenty of fluid is where most people land. It is better used situationally than as a permanent bowel routine, and if the problem persists for weeks that is a conversation with your clinician, not a supplement decision.
Can I take magnesium glycinate and citrate together?
Yes, but count total elemental magnesium rather than total capsules. The tolerable upper intake level for supplemental magnesium in adults is 350 mg per day, and that ceiling exists because of digestive effects, not toxicity. A common split is citrate with breakfast and glycinate at night, staying inside your own tolerance.
Which magnesium form should I actually avoid?
Magnesium oxide as your primary daily magnesium. It looks impressive on a label because it is about 60% elemental magnesium by weight, but its absorbed fraction lands in the single digits in comparative studies. Also skip proprietary magnesium complexes that never disclose how much elemental magnesium you are getting.
Written for adults aged 18 and over. This content is for education only and is not medical advice. Supplements are not intended to diagnose, treat, cure, or prevent any disease. Talk with your clinician before starting any supplement, especially if you are pregnant, nursing, taking medication, or managing a health condition. Supplements for children are a pediatric clinician's decision — keep all supplements out of reach of children.
Our medical advisor is Dr. Garrett Wdowin, NMD, ABAAHP, FAARM, naturopathic doctor. This page has not been medically reviewed.