MAGNESIUM GUIDE
Types of Magnesium: A Plain Guide to Every Common Form
There are many types of magnesium on supplement shelves, and the name on the front tells you less than the number on the back. This guide explains the common forms, what the sources actually say about them, and how to read a label before you buy.
Tri-Mag Night is a three-form magnesium complex, 90 capsules.
Three magnesium forms
200 mg elemental magnesium per serving
90 capsules per bottle
30 servings per bottle
Taken in the evening
Three magnesium forms
200 mg elemental magnesium per serving
90 capsules per bottle
30 servings per bottle
Taken in the evening
3
forms: bisglycinate, L-threonate and taurate
200
mg elemental magnesium per serving
90
capsules in each bottle
30
servings in each bottle
The facts printed on the label, in one place. The number that matters is elemental magnesium, not the weight of the compound.
Tri-Mag Night label facts
Serving size
3 capsules
Servings per bottle
30
Elemental magnesium per serving
200 mg
Magnesium forms
Bisglycinate, L-threonate, taurate
Capsules per bottle
90
Directions
Three capsules in the evening, with water
Only facts from the product label and listing are shown.
Do the different types of magnesium actually matter?
Magnesium is one mineral. What differs from product to product is what it is attached to, such as citrate, glycine or oxide. That changes how much actual magnesium is in each capsule and can change how well it dissolves, which is why the forms are not interchangeable.
- Check elemental magnesium first. That is the milligram figure for the mineral itself, not the whole compound.
- Solubility matters. The NIH Office of Dietary Supplements says forms that dissolve well in liquid tend to be absorbed better, and that citrate has higher bioavailability than oxide.
- Dose matters more than the name. The NIH upper limit for supplemental magnesium in adults is 350 mg a day, and high doses of any form can cause diarrhea.
- Sleep claims are modest. Trials are mixed, so no form should be sold to you as a sleep fix.
Looking for something narrower? The dosage guide works through elemental versus compound weight and the official limits, and the timing guide covers meals and medicines.
OUR MAGNESIUM GLYCINATE
pr1mebody magnesium glycinate, 90 capsules
pr1mebody magnesium glycinate is our everyday magnesium: magnesium glycinate (bisglycinate) in veggie capsules, 360 mg of magnesium per three-capsule serving, taken with a meal and water. 90 capsules, 30 servings.
- Magnesium: 360 mg per serving (as magnesium glycinate)
- Serving: 3 veggie capsules with a meal and water
- 90 capsules, 30 servings per bottle
From
$26.99
1 bottle
90 capsules · 30 servings · $0.90 per serving
$26.99
Buy 2, get 1 free
3 bottles
270 capsules · 90 servings · $0.60 per serving
$53.99
5 bottles
450 capsules · 150 servings · $0.72 per serving
$107.99
Best value
12 bottles
1,080 capsules · 360 servings · $0.44 per serving
$159.99
See the full product page · Read first: types of magnesium explained · Prefer three magnesium forms at a lower dose? See Tri-Mag Night
Prices in US dollars as of 12 Oct 2026. Free tracked shipping and a 30-day money-back guarantee. Checkout opens on satiovex.com, the store run by Xinop LLC, which also sells pr1mebody products; the item may appear there under the Satiovex name.
AT A GLANCE
The common forms side by side
The forms you are most likely to meet, in one table. The last column says only what we could source; where it says none found, we found nothing we could cite.
Form
Bound to
What the sources say
Evidence strength
Form
Magnesium oxide
Bound to
Oxygen
What the sources say
NIH: tends to have lower bioavailability than citrate
Evidence strength
Authoritative fact sheet
Form
Magnesium citrate
Bound to
Citric acid
What the sources say
NIH: tends to have higher bioavailability than oxide
Evidence strength
Authoritative fact sheet
Form
Magnesium bisglycinate (glycinate)
Bound to
Two glycine molecules
What the sources say
Has one placebo-controlled sleep trial that reported a small benefit over 4 weeks; the details are in the sleep guide
Evidence strength
One randomized trial
Form
Magnesium L-threonate
Bound to
Threonic acid
What the sources say
One small, 21-day sleep trial reported better sleep scores
Evidence strength
One small randomized trial
Form
Magnesium taurate
Bound to
Taurine
What the sources say
No source we could cite for sleep or other outcomes
Evidence strength
None found
Form
Chloride, lactate, aspartate
Bound to
Chloride, lactic acid, aspartic acid
What the sources say
NIH: tend to have higher bioavailability than oxide and sulfate
Evidence strength
Authoritative fact sheet
Form
Magnesium sulfate
Bound to
Sulfate
What the sources say
NIH: tends to have lower bioavailability than citrate
Evidence strength
Authoritative fact sheet
Notice what is missing: none of the sources we read ranks every form from best to worst, so a neat league table of the types of magnesium is a simplification.
Why elemental magnesium is the number that matters
A label that says 400 mg of a magnesium compound is describing the compound, not the mineral. Each compound is only partly magnesium by weight, and the share differs between the types of magnesium. That is why two bottles with the same big number on the front can deliver different amounts of the mineral.
Our Tri-Mag Night product listing makes the point with bisglycinate, which it describes as roughly 14 percent elemental magnesium by weight. On that basis 400 mg of bisglycinate would carry about 56 mg of the mineral. Whatever form you are comparing, look for the line that says elemental magnesium.
Elemental magnesium is also the figure the official guidance uses. The NIH Office of Dietary Supplements and the NHS both give daily reference amounts that cover everything you eat and drink, not only supplements; the figures are in the table further down.
MAGNESIUM
The name on the front of the bottle matters less than the elemental magnesium line on the back.
The main types of magnesium, one by one
Magnesium oxide
Oxide is the usual budget choice among the types of magnesium: it is cheap and packs a lot of magnesium into a small tablet. The NIH fact sheet says oxide tends to have lower bioavailability than citrate. Lower absorption is not the same as useless, but it is a reason to read the dose carefully.
Magnesium citrate
Citrate is magnesium with citric acid. The NIH fact sheet lists it among the forms with higher bioavailability than oxide and sulfate. It is widely sold in powders and capsules, and you will often hear that it loosens the bowels. The NIH notes that magnesium is a key ingredient in certain laxatives and that high doses from supplements can cause diarrhea, nausea and cramping. We did not find a head-to-head gut comparison between forms that we could cite, so treat gut claims about any single form with care.
Citrate is one of the better-documented forms for absorption. A fuller side-by-side with glycinate is in magnesium glycinate vs citrate.
Magnesium bisglycinate (glycinate)
Bisglycinate pairs magnesium with two molecules of the amino acid glycine. Of the forms with sleep trials it is the better studied: a 2025 placebo-controlled trial of 250 mg of elemental magnesium reported a small improvement in insomnia scores after four weeks.
Magnesium L-threonate
L-threonate is one of the newer forms, bound to threonic acid. A 2024 trial of 80 adults aged 35 to 55 with self-reported sleep problems gave 1 g a day of the compound or placebo for 21 days, and the authors reported better sleep scores in the threonate group. It is a single small, short trial, and 1 g is the weight of the compound, not elemental magnesium.
Magnesium taurate
Taurate is magnesium bound to taurine. We found no human trial on it that we could cite, so we make no claims about what it does, and it is the form we can say least about. If a seller makes strong claims for it, ask which study they mean.
Chloride, lactate, aspartate and sulfate
Among the less common types of magnesium, the NIH places chloride, lactate and aspartate alongside citrate as having higher bioavailability than oxide and sulfate. Sulfate is on the lower side, like oxide.
What should a label show before you buy?
Use this checklist on any bottle, ours included. A good label lets you answer every line without guessing, whichever form it lists.
- The form by name, such as bisglycinate or citrate, not only the word magnesium.
- Elemental magnesium per serving in milligrams, and the percentage of the reference intake if the label gives one.
- The serving size in capsules. A bottle of 90 capsules may be 30 servings or 90, depending on the dose.
- The split between forms if it is a blend. A blend that lists three forms but hides the amounts of each tells you little.
- Other ingredients, including fillers and capsule type.
- A clear warning line for pregnancy, breastfeeding, kidney problems and medication.
- Company and contact details you could actually use if something is wrong.
A note on our own listing
The Tri-Mag Night listing gives the total of 200 mg elemental magnesium per serving and names the three forms. The listing we read does not state how much of each form is in a serving, so check the pack for that line before you rely on any single form.
How much magnesium is enough, and how much is too much
Start from food, whichever form you end up using. The NIH lists green leafy vegetables, legumes, nuts, seeds and whole grains as good sources, and the NHS names spinach, nuts and wholemeal bread. The NIH also says that about 30 to 40 percent of the magnesium in food and drink is absorbed.
For supplements, two public bodies give slightly different ceilings, and the ceilings apply to all types of magnesium combined. The NIH Office of Dietary Supplements sets the Tolerable Upper Intake Level for supplemental magnesium at 350 mg a day for adults. The NHS says that taking 400 mg or less a day from supplements is unlikely to cause harm, and that more than 400 mg for a short time can cause diarrhoea. Treat the lower figure as the safer planning number and remember it counts all supplements and medicines containing magnesium.
The NIH also describes magnesium toxicity at very high doses, with low blood pressure, vomiting, breathing difficulty and irregular heartbeat. That is far from normal supplement use, but it is why the daily ceiling exists.
Source
Figure
What it covers
Source
NIH Office of Dietary Supplements
Figure
310 to 420 mg a day for adults
What it covers
Recommended intakes from food and supplements, by age and sex
Source
NHS
Figure
300 mg men, 270 mg women (19 to 64)
What it covers
Daily amounts from food and supplements
Source
NIH Office of Dietary Supplements
Figure
350 mg a day for adults
What it covers
Upper limit for supplemental magnesium only
Source
NHS
Figure
400 mg or less a day
What it covers
Supplement total unlikely to cause harm
MAGNESIUM
Count every supplement and medicine that contains magnesium toward one daily total.
Who should ask a doctor first
Supplements are not medicines, and no form of magnesium is harmless for everyone. The NIH says kidney function largely controls magnesium balance in the body, so anyone with kidney problems should speak to a doctor before taking a supplement.
The NIH also warns that magnesium may interact with oral bisphosphonates, tetracycline antibiotics and quinolone antibiotics, and that diuretics and proton pump inhibitors can affect magnesium status. If you take any of these, ask a pharmacist or doctor about timing and suitability.
If you are pregnant or breastfeeding, or you are choosing a supplement for a child, get personal advice first. A guide like this one cannot replace it.
Does the form matter for sleep?
Many people comparing forms are really asking which one helps sleep. The evidence is mixed: the latest systematic review we found rated its certainty as low to very low. Each study, its size and its limits are set out in our guide to magnesium for sleep. If sleep is a persistent problem, a doctor is a better first stop than a supplement.
OUR CAPSULES
Tri-Mag Night: three forms in one capsule product
Tri-Mag Night is a three-form complex of bisglycinate, L-threonate and taurate. The product listing gives 200 mg of elemental magnesium per serving, taken as three capsules in the evening, with 90 capsules making 30 servings. That sits below the 350 mg NIH upper limit for supplemental magnesium, but your total from all supplements is what counts. The listing also carries the usual warning to speak to a doctor if you are pregnant, breastfeeding, have kidney problems or take medication.
Magnesium gummies versus capsules
Plenty of people prefer a chew to a capsule. The format changes what a label can show, but the number that matters is the same: the elemental magnesium you actually swallow. Ask of any gummy the questions you would ask of a capsule: which form, how many milligrams of elemental magnesium per piece, and what the serving size is. We sell capsules and do not sell magnesium gummies, so we will not recommend one; we would rather you learn to read any label than trust ours blindly.
Questions people ask about types of magnesium
What are the main types of magnesium?
The common ones are oxide, citrate, bisglycinate (glycinate), L-threonate, taurate, chloride, lactate, aspartate and sulfate. They are all the same mineral attached to different molecules, and that changes the elemental magnesium per dose and how well the compound dissolves.
Is there a best form of magnesium?
None is best for everyone, and the sources we read do not rank them all. The NIH says forms that dissolve well tend to absorb better, and that citrate is more bioavailable than oxide. Beyond that, choose by tolerance, dose on the label and your doctor's advice.
Is magnesium glycinate or citrate better?
They suit different priorities and we found no head-to-head trial we could cite. Citrate has better-documented absorption compared with oxide; glycinate has a recent sleep trial with a small effect.
Can you take magnesium glycinate and citrate together?
Nothing in the sources we read says you cannot, but the amounts add up. What matters is your total supplemental magnesium across everything you take, compared with the 350 mg NIH upper limit for adults or the NHS 400 mg guide.
Does magnesium help you sleep?
Maybe, modestly, for some people. The latest systematic review we found rated the certainty of the evidence as low to very low.
Can you take magnesium every night?
Plenty of people do, and the NHS says up to 400 mg a day from supplements is unlikely to cause harm for most adults. Stay below the ceiling, count all sources, and speak to your doctor if you have kidney problems or take interacting medication.
Are magnesium gummies as good as capsules?
That depends on the label, not the format. Compare elemental magnesium per serving and the form used. We sell capsules and do not sell magnesium gummies.
Can magnesium cause diarrhea?
Yes. The NIH says high doses from supplements or medicines can cause diarrhea, nausea and abdominal cramping, and the NHS lists diarrhoea as the effect of taking more than 400 mg.
What we could not source
Health, dose and safety statements on this page come from the sources listed below, mainly the NIH Office of Dietary Supplements fact sheet and the NHS magnesium guidance. We read each of them; where we read only an abstract, the text says so. Product facts come from our own Tri-Mag Night listing.
- We found no source we could cite for how magnesium taurate affects sleep, so we make no claim about it.
- We did not find a head-to-head trial comparing every form, so we do not rank them.
- The sleep trials and the review are cited from their abstracts only. The trials are small and short, and the review rates the overall certainty as low to very low.
- This page has not yet been reviewed by a licensed professional. Our standards are on the editorial policy page.
Keep reading
KEEP READING
Related reading on magnesium
Magnesium for Sleep
Magnesium for sleep: two small trials and three reviews, why the evidence is rated low, and what the NIH and NHS say about daily limits.
Read the guide →
Magnesium Glycinate Dosage
Magnesium glycinate dosage starts with the elemental magnesium on the label. See how to read it and where the NIH, EFSA and NHS limits sit.
Read the guide →
When to Take Magnesium
When to take magnesium: what small studies say about food and evening dosing, plus the spacing rules for bisphosphonates and antibiotics.
Read the guide →
Product: pr1mebody Magnesium Glycinate
pr1mebody magnesium glycinate: 90 veggie capsules, 360 mg magnesium per serving, above the NIH 350 mg limit. See the label and who should ask first.
See the product →
Product: Tri-Mag Night
Tri-Mag Night combines three magnesium forms: 200 mg of elemental magnesium per serving, 90 capsules a bottle. Label facts, cautions and the research.
See the product →
Looking for magnesium capsules?
Tri-Mag Night is a three-form magnesium complex, 90 capsules. Check the label details and the warnings before you order.
Food supplement, not a medicine. If you are pregnant, breastfeeding, have kidney problems or take medication, speak to your doctor before using magnesium supplements.