Magnesium glycinate and magnesium citrate are two widely used forms of magnesium. The main difference is the substance attached to the magnesium: glycinate is combined with glycine, while citrate is combined with citric acid.
Neither form is automatically better for everyone. Glycinate is frequently selected for evening routines or by people wishing to avoid citrate’s potential stool-loosening effect. Citrate is widely available and has established evidence of better absorption than magnesium oxide, but it may have a more noticeable effect on digestion.
The best choice depends on elemental magnesium, the complete serving, digestive tolerance, other ingredients, label directions and how the product fits into your routine.
What is magnesium?
Magnesium is an essential mineral found naturally in foods including spinach, nuts, seeds, wholemeal bread and pulses.
According to the Great Britain nutrition and health claims register, magnesium contributes to:
- Normal muscle function
- Normal functioning of the nervous system
- Normal psychological function
- Normal energy-yielding metabolism
- A reduction in tiredness and fatigue
- Electrolyte balance
- Normal protein synthesis
- The maintenance of normal bones and teeth
These claims may be used for foods and supplements that meet the conditions for being a source of magnesium. They describe the nutritional functions of magnesium and do not establish that glycinate, citrate or another form can prevent, treat or cure a medical condition.
Our broader guide to magnesium for sleep and recovery explains these recognised functions and the wider evidence in more detail.
Why are there different forms of magnesium?
Pure magnesium is not normally used on its own in food supplements. It is combined with another substance to create a magnesium compound such as glycinate, citrate, oxide, malate or chloride.
The resulting compound can affect:
- How readily it dissolves
- How much elemental magnesium it contains
- How completely it is absorbed
- Digestive tolerance
- The required serving size
- The number and size of capsules
- The price of the finished product
The form is therefore worth checking, but it is only one feature of the complete supplement.
What is magnesium glycinate?
Magnesium glycinate is magnesium combined with glycine, an amino acid. It may also be described as magnesium bisglycinate or magnesium diglycinate.
The terms glycinate and bisglycinate are frequently used interchangeably in supplement marketing. More precisely, bisglycinate describes magnesium bonded with two glycine molecules. Formulations can still differ between manufacturers, so the complete ingredient panel is more reliable than the name on the front.
Magnesium glycinate is commonly marketed for evening, relaxation and recovery routines. However, it should not be assumed that it is a sedative or that it has been proved to improve sleep for everyone.
An older study of magnesium diglycinate and magnesium oxide found evidence that diglycinate could be absorbed. However, the participants had undergone ileal resection, and the study did not compare glycinate directly with citrate in typical healthy adults. It therefore cannot establish that glycinate is universally the best-absorbed form.
Why might someone choose glycinate?
Magnesium glycinate may be a practical option for someone who:
- Prefers to include magnesium in an evening routine
- Wants to avoid citrate’s potential stool-loosening effect
- Has previously tolerated a glycinate product
- Is comfortable with the serving size and price
- Has checked the elemental magnesium declared on the label
Individual tolerance varies. Glycinate can still cause digestive discomfort, and its popularity does not prove that it is suitable for everyone.
What is magnesium citrate?
Magnesium citrate is magnesium combined with citric acid. It is widely available in single-form supplements and multi-form magnesium complexes.
The US National Institutes of Health’s magnesium fact sheet for health professionals reports that citrate is among several forms found in small studies to be absorbed more completely than magnesium oxide.
This is useful when comparing citrate with oxide, but it does not prove that citrate is superior to glycinate or that better absorption necessarily produces a better outcome for every person.
Why might someone choose citrate?
Magnesium citrate may be a practical option for someone who:
- Wants a widely available magnesium form
- Prefers a form with evidence of better absorption than oxide
- Has previously used citrate without digestive discomfort
- Is comfortable with its possible effect on bowel movements
- Has checked the complete serving and elemental amount
Citrate may loosen stools, particularly at larger amounts. Always follow the product directions rather than taking additional capsules to obtain a faster or stronger result.
Magnesium glycinate vs citrate: quick comparison
| Feature | Magnesium glycinate | Magnesium citrate |
|---|---|---|
| Combined with | Glycine | Citric acid |
| Alternative name | Bisglycinate or diglycinate | Magnesium citrate |
| Commonly selected for | Evening and general magnesium routines | General magnesium supplementation |
| Digestive consideration | Often selected by people wishing to avoid citrate | May loosen stools |
| Absorption evidence | Evidence exists, but direct comparisons are limited | Better established against magnesium oxide |
| Proved better for sleep | No | No |
| Best for everyone | No | No |
Which form is absorbed better?
There is not enough high-quality research directly comparing magnesium glycinate with magnesium citrate in typical healthy adults to declare one universally better absorbed.
Citrate has reasonably established evidence of better absorption than magnesium oxide. Glycinate also has evidence that it can be absorbed, but many strong claims about its superiority go beyond what direct comparative studies demonstrate.
Absorption can also be influenced by:
- The elemental magnesium amount
- The complete product formulation
- Solubility
- Whether the product is taken with food
- The individual’s existing magnesium status
- Digestive health
- Other medicines and supplements
- How absorption is measured in the study
The most absorbable compound on paper is not necessarily the most practical product. A supplement is unlikely to fit someone’s routine when the serving is difficult to maintain or repeatedly causes digestive discomfort.
Which is gentler on digestion?
Magnesium glycinate is often chosen by people wishing to avoid the stool-loosening effect associated with citrate. However, individual tolerance varies, and glycinate can still cause digestive symptoms.
Citrate may have a more noticeable effect on bowel movements. Some people may not mind this effect, while others may find it inconvenient.
When trying a magnesium supplement:
- Follow the recommended serving
- Do not take extra to obtain faster results
- Take it with food when permitted by the directions if this feels more comfortable
- Stop using it and seek advice if symptoms are persistent or severe
Persistent constipation, diarrhoea or unexplained digestive symptoms should be discussed with a GP rather than managed solely by changing supplements.
Is magnesium glycinate better for sleep?
Glycinate is frequently marketed for nighttime use, but it is not a sleeping medicine. Current evidence does not establish that it improves sleep for everyone or that it is always better than citrate.
Someone who wants to include magnesium in an evening routine may choose glycinate, particularly when citrate affects their digestion. Someone who already tolerates citrate may have no reason to change solely because glycinate is more heavily promoted for sleep.
Our dedicated guide to which magnesium is best for sleep compares the wider range of forms and examines the limitations of the sleep evidence.
What is elemental magnesium?
Elemental magnesium is the amount of actual magnesium supplied by a supplement. This is different from the total weight of magnesium glycinate, citrate or a multi-form complex.
For example, a label may display “magnesium glycinate complex 1,000mg”. That figure can describe the entire compound rather than 1,000mg of elemental magnesium.
When comparing products, look for a nutritional declaration that states the amount simply as magnesium and confirms whether it applies per capsule or per complete daily serving.
A large compound weight does not automatically mean a high amount of elemental magnesium, and a larger quantity is not automatically more suitable.
Can magnesium glycinate and citrate be taken together?
Glycinate and citrate can appear together in a multi-form magnesium complex. This can be more convenient than purchasing separate products, but combining forms does not guarantee better absorption or results.
For examples of blended formulations, compare the current labels for the Magnesium 8-in-1 Complex 90 Capsules and the Vitarosa Magnesium 12-in-1 Complex 120 Capsules.
The Vitarosa listing states that its 700mg figure describes a magnesium complex containing 12 magnesium sources, including glycinate and citrate. It does not state that the product supplies 700mg of elemental magnesium.
Before combining separate magnesium products:
- Add together the elemental magnesium from every full daily serving
- Check for duplicated vitamins, minerals and other ingredients
- Follow the warnings on each label
- Consider whether combining them increases digestive discomfort
- Ask a pharmacist when taking regular medication
How to compare magnesium supplement labels
Elemental magnesium per daily serving
Use the amount labelled simply as magnesium. Confirm whether it applies to one capsule or the complete recommended serving.
Number of capsules
One supplement may provide its stated serving in one capsule while another requires two, three or four. Calculate how many complete daily servings the container provides.
Additional magnesium forms
A product prominently marketed as glycinate or citrate may also contain magnesium oxide or other forms. Read the complete ingredients rather than relying on the front label.
Other active ingredients
Check for vitamin B6, calcium, zinc, botanicals or other added ingredients. Review every supplement you already use to avoid unnecessary duplication.
Dietary suitability
Magnesium itself is a mineral, but capsule shells and processing ingredients can vary. Check for explicit vegetarian, vegan and allergen information where relevant.
Cost per serving
Compare the price per complete recommended daily serving rather than the bottle price or capsule count alone. You can use these same checks across the wider capsule supplement range.
How much magnesium should you take?
The NHS magnesium guidance states that adults aged 19 to 64 require approximately 300mg a day for men and 270mg for women. These are general dietary requirements, not target supplement doses.
The NHS advises that taking more than 400mg of magnesium from supplements for a short period can cause diarrhoea. It states that 400mg or less a day from supplements is unlikely to cause harm for most people.
This is a general safety statement rather than a recommendation to take 400mg. Follow the serving on the product and account for magnesium supplied by any other supplements.
Can magnesium interact with medicines?
Magnesium can interact with some medicines or affect their absorption, including certain antibiotics and bisphosphonates used for osteoporosis.
A pharmacist can advise whether magnesium and a medicine need to be separated. Seek professional advice before starting a supplement if you:
- Have kidney problems or another diagnosed condition
- Take regular medicines
- Are pregnant or breastfeeding
- Are awaiting surgery
- Are considering a supplement for someone under 18
- Believe you may have a nutritional deficiency
The latest government food-supplement guidance advises consumers to follow label warnings, avoid exceeding the recommended dose and consult a healthcare professional when taking prescribed medication or managing a medical condition.
When should you take magnesium glycinate or citrate?
Neither glycinate nor citrate has a universally established time when it must be taken.
Glycinate is commonly included in evening routines, while citrate may be taken whenever it fits the label directions and does not cause digestive inconvenience. Both can potentially be taken in the morning or evening.
Our guide to the best time to take magnesium explains morning use, evening use, food and medication spacing in more detail.
Compare glycinate and citrate in the ingredient collection
The Magnesium Supplements & Products collection now brings together single-form products, blends, drink mixes and separately labelled topical patches. Begin with two oral products when comparing elemental amounts; a patch's printed composition is not evidence of equivalent absorption.
For concrete label examples, Nuke Nutrition Magnesium Glycinate Capsules – 240mg Magnesium per Serving declares 240mg magnesium per serving, while Nuke Nutrition Magnesium Citrate Tablets – 201mg Magnesium per 3 Tablets declares 201mg across three tablets. Those numbers apply to their respective complete servings. Follow each product's directions rather than increasing the serving to make the figures match.
Open the full ingredient list too. A product sold as glycinate can be a blend, and calcium, zinc, vitamin B6 or botanical ingredients may duplicate another supplement. For a multi-form product, our 8-in-1 vs 12-in-1 magnesium guide explains why the number of forms does not establish a higher elemental dose.
Does magnesium stearate count as a magnesium supplement ingredient?
Magnesium stearate listed as an anti-caking or processing ingredient should not be used to calculate a nutritional magnesium serving. Look for magnesium expressly declared in the nutrition information.
Frequently asked questions
Are magnesium glycinate and bisglycinate the same?
The names are frequently used interchangeably. Bisglycinate more specifically describes magnesium bonded with two glycine molecules. Check the complete ingredients because formulations can differ between products.
Is magnesium citrate stronger than glycinate?
Not necessarily. Compare strength using elemental magnesium per complete daily serving rather than the total weight of citrate or glycinate.
Can magnesium citrate be taken at night?
Yes, when evening use agrees with the product directions. Some people may prefer taking it earlier because citrate can affect digestion.
Can magnesium glycinate be taken during the day?
Yes. Marketing glycinate for nighttime use does not mean it can only be taken at night. Follow the product instructions and choose a consistent time.
Does magnesium glycinate make you sleepy?
Magnesium glycinate is not a sedative and should not be expected to cause immediate drowsiness. Evidence does not establish that it improves sleep for everyone.
Which form is better for normal muscle function?
Both forms can supply magnesium. Magnesium contributes to normal muscle function when the product meets the conditions for the authorised claim. One form has not been established as universally better for this purpose.
Magnesium glycinate or citrate: the verdict
Glycinate combines magnesium with glycine and is commonly selected for evening routines or by people wishing to avoid citrate’s potential digestive effects. Citrate combines magnesium with citric acid, is widely available and has evidence of better absorption than magnesium oxide.
Neither form is automatically the best choice. Compare elemental magnesium, complete serving, other ingredients, digestive tolerance, dietary suitability and directions.
To compare magnesium with other products intended for calm and evening routines, browse the Calm & Sleep collection and read each current product label before choosing.