How Much Magnesium Glycinate Per Day?
Published Updated Ben Law
Reviewed by Sarah Law, Dip CNM, Naturopathic Nutritionist
- 200 to 400 mg of elemental magnesium per day suits most adults, ideally split morning and evening.
- Dose by the elemental figure on the label, not the compound weight: 1,000 mg of magnesium glycinate holds only about 110 to 141 mg of magnesium.
- UK reference intake: 300 mg a day for men, 270 mg for women (NHS). 400 mg or less a day from supplements is unlikely to cause harm. In the US, the NIH RDA is 400 to 420 mg for men and 310 to 320 mg for women, with an upper limit of 350 mg a day from supplements.
- Start low (100 to 200 mg) and build up over a week or two to find your comfortable level; loose stools mean the dose is too high.
- Consistency matters: give it 8 to 12 weeks of daily use to judge the effect.
The optimal daily dose of magnesium glycinate typically ranges from 200 mg to 400 mg of elemental magnesium, often split into two doses to aid absorption and minimise digestive upset [1]. In the UK, the NHS puts adult needs at 300 mg a day for men and 270 mg for women, and says 400 mg or less a day from supplements is unlikely to cause harm [2]. In the US, the NIH sets the recommended dietary allowance (RDA) at 400 to 420 mg a day for men and 310 to 320 mg for women, with a Tolerable Upper Intake Level of 350 mg a day from supplements [6]. For reference, the full 4-capsule daily serving of Love Life Supplements Magnesium Glycinate provides 303 mg of elemental magnesium from 2,750 mg of fully reacted magnesium bisglycinate, with 240 vegan capsules (60 servings) per tub, batch tested by Eurofins.
What Is the Recommended Daily Dosage of Magnesium Glycinate?
The recommended daily dosage of magnesium glycinate for most adults is 200 mg to 400 mg of elemental magnesium, taken with food and often split into a morning and an evening dose [1]. That range covers the UK reference intakes of 270 to 300 mg a day while staying within the 400 mg a day the NHS says is unlikely to cause harm from supplements [2].
Many practitioners suggest splitting the dose, for example half in the morning and half in the evening, to keep levels steady through the day and keep the gut comfortable. If you already eat plenty of magnesium-rich foods (leafy greens, nuts, seeds, wholegrains), the lower end of the range is usually enough, because supplements are there to top up your diet, not replace it.
Love Life Supplements' Magnesium Glycinate is formulated to fit this guidance, providing 303 mg of elemental magnesium per daily serving of 4 capsules. Each capsule holds about 76 mg, which makes it easy to land anywhere in the 200 to 400 mg range or to split the serving into a morning and evening dose.
The same figures apply whatever the label calls it: the magnesium glycinate dosage for adults, the recommended dose of magnesium glycinate, the magnesium glycinate serving size and how much magnesium bisglycinate per day are all answered by the elemental figure, because magnesium bisglycinate is simply the full chemical name of the same compound. Doses of 200 mg or 240 mg of elemental magnesium a day are both well within the usual range. The upper limit to keep in mind is 400 mg a day from supplements in the UK, and 350 mg a day in the US (the NIH Tolerable Upper Intake Level, which also counts magnesium from medicines such as antacids) [6].
It is sensible to start low, at around 100 to 200 mg of elemental magnesium, and build up over several days or weeks. This lets your body adjust and helps you find the dose that gives benefits without digestive upset. Glycinate is gentle, but excessive intake can still cause loose stools in sensitive people [1].
Recommended magnesium glycinate dose by goal
| Situation | Typical elemental magnesium per day | How people usually take it |
|---|---|---|
| First week, new to magnesium | 100 to 200 mg | One dose with the evening meal |
| General daily top-up | 200 to 300 mg | Split morning and evening, with food |
| Evening wind-down routine | 200 to 300 mg | Main dose 30 to 60 minutes before bed |
| Low dietary intake or active lifestyle | 300 to 400 mg | Split across two meals |
| Above 400 mg a day | Only on professional advice | Supervised by your GP or practitioner |
Figures are elemental magnesium from supplements, on top of food. Ranges reflect common practice and the UK and US guidance cited below, not a prescription.
How Many mg of Magnesium Glycinate Per Day? Elemental vs Compound
Aim for 200 to 400 mg of elemental magnesium per day, which is roughly 1,400 to 3,600 mg of magnesium glycinate compound depending on the product. The gap is large because magnesium is only a small part of the magnesium glycinate molecule, so the "how many mg" question has two answers and you need the elemental one.
Pure magnesium bisglycinate (C4H8MgN2O4, molecular weight 172.4) is at most 14.1% magnesium by weight [3]. Fully reacted commercial forms usually come in a little lower once the reaction process is accounted for: our own label works out at 11% (2,750 mg of bisglycinate giving 303 mg of elemental magnesium). A product claiming much more than 14.1% elemental from "glycinate" alone has very likely added magnesium oxide, which is cheaper and far less well absorbed.
We checked our own figure independently. Eurofins tested batch L1026118 of Love Life Supplements Magnesium Glycinate (report AR-733-2026-00087324, July 2026), measuring magnesium twice by ICP-OES at 269.6 mg and 302.4 mg per 4-capsule serving; the lab confirmed the 303 mg label claim within its expanded measurement uncertainty. The same report quantified lead at 0.10 mg/kg, 30 times below the EU limit of 3.0 mg/kg for food supplements. The results are on the product page.
Magnesium glycinate compound to elemental magnesium converter
| Magnesium glycinate on the label (compound) | Elemental magnesium at the 14.1% maximum | Elemental magnesium at 11% (fully reacted, our label ratio) |
|---|---|---|
| 200 mg | 28 mg | 22 mg |
| 500 mg | 71 mg | 55 mg |
| 1,000 mg | 141 mg | 110 mg |
| 2,000 mg | 282 mg | 220 mg |
| 2,750 mg (Love Life Supplements, 4 capsules) | 388 mg | 303 mg (as stated on our label) |
| 3,000 mg | 423 mg | 330 mg |
Calculated from the molecular weights of magnesium (24.3) and magnesium bisglycinate (172.4). Your label's elemental figure always overrides this table.
How many grams of magnesium glycinate per day?
In grams, most people take between about 1.5 g and 3.5 g of magnesium glycinate compound a day to reach 200 to 400 mg of elemental magnesium. Our 4-capsule serving is 2.75 g of bisglycinate.
How Many Magnesium Glycinate Capsules Per Day?
Most people take 2 to 4 magnesium glycinate capsules per day, but the right number depends on the elemental magnesium in each capsule, which varies a lot between brands. Read the per-capsule elemental figure, then count capsules to reach your daily amount. The table below does that maths for Love Life Supplements Magnesium Glycinate using today's prices.
| Capsules per day | Magnesium bisglycinate | Elemental magnesium | % of UK reference intake (men 300 mg / women 270 mg) | Cost per day (one-off / subscribe) |
|---|---|---|---|---|
| 1 | 688 mg | 76 mg | 25% / 28% | 16p / 14p |
| 2 | 1,375 mg | 152 mg | 51% / 56% | 32p / 28p |
| 3 | 2,063 mg | 227 mg | 76% / 84% | 47p / 43p |
| 4 (full serving) | 2,750 mg | 303 mg | 101% / 112% | 63p / 57p |
Based on 240 capsules per tub at £37.95 one-off or £34.16 on a first Subscribe & Save order, storefront prices on 13 October 2026. That is about 21p per 100 mg of elemental magnesium at the one-off price. Every tub carries our 60-day money-back guarantee.
US readers: the same 240-capsule tub is $51.18 one-off on our US store, about 85 cents a day at the full 4-capsule serving. Against the US RDA, 4 capsules (303 mg) cover roughly 72 to 76% of the 400 to 420 mg for men and 95 to 98% of the 310 to 320 mg for women, and stay under the 350 mg US upper limit for supplements.
If you are wondering whether to take 1 or 2 capsules, start with 1 or 2 for the first week, then add a capsule every few days if you are comfortable, up to the 4-capsule serving on the label. Do not exceed the recommended amount unless your doctor advises it.
How Much Magnesium Do We Need Daily?
UK adults need about 300 mg of magnesium a day (men) and 270 mg a day (women), according to the NHS [2]. These are total intakes from food and supplements together, so a supplement only needs to cover whatever your diet leaves short. Other authorities set slightly different numbers, which is why you will see figures from 270 mg to 420 mg quoted online.
Magnesium reference intakes: UK vs EU vs US
| Authority | Adult men | Adult women | Upper level for supplements |
|---|---|---|---|
| UK (NHS / Department of Health and Social Care) [2] | 300 mg | 270 mg | 400 mg or less a day unlikely to cause harm |
| EU (EFSA adequate intake, 2015) [4] | 350 mg | 300 mg | 250 mg a day for readily dissociable magnesium salts and magnesium oxide [5] |
| US (NIH recommended dietary allowance) [6] | 400 to 420 mg | 310 to 320 mg | 350 mg a day from supplements |
| Love Life Supplements Magnesium Glycinate, 4 capsules | 303 mg elemental (can be split into 2 + 2) | Within the UK 400 mg guidance and the US 350 mg upper limit | |
Upper levels apply to magnesium from supplements and fortified foods, not to magnesium naturally present in food. The EU and US limits were set around the risk of mild laxative effects.
Diet alone often falls short. A review in Open Heart estimated that a large share of adults in Western countries do not meet recommended magnesium intakes from food [7]. Food processing, low intakes of greens and wholegrains, and certain medications all chip away at how much magnesium we actually get, which is why supplementation can help even for people who eat reasonably well.
One point that trips people up: these figures refer to elemental magnesium, the actual amount of magnesium your body can use. A magnesium glycinate label usually states the total weight of the compound and then, separately, the elemental magnesium within that dose. Always work from the elemental figure when planning your intake.
"When choosing a magnesium supplement, always look for the elemental magnesium content on the label. This is the amount your body can actually utilise, and it is often much lower than the total compound weight."
Sarah Law, Naturopathic Nutritionist | Optimised Female
Magnesium Glycinate Dosage for Women and Men
The magnesium glycinate dosage for women is usually 200 to 300 mg of elemental magnesium a day, and for men 250 to 400 mg, reflecting the UK reference intakes of 270 mg for women and 300 mg for men [2]. Put simply, the magnesium glycinate dose for women is a little lower than the magnesium glycinate dose for men. Body size, diet and activity level matter more than sex alone, so use these as starting points. In the US, the NIH RDA is 310 to 320 mg a day for women and 400 to 420 mg for men, so US targets sit a little higher, while the 350 mg upper limit from supplements is the same for both [6].
How much magnesium glycinate per day for a woman?
For most women, 200 to 300 mg of elemental magnesium a day from magnesium glycinate is a sensible daily amount, which is 3 to 4 of our capsules. Needs change during pregnancy and breastfeeding, so speak to your midwife or GP before supplementing then. Many women in perimenopause and menopause look at magnesium too; our guide to magnesium for perimenopause and menopause covers what the evidence says.
How much magnesium glycinate per day for a man?
For most men, 250 to 400 mg of elemental magnesium a day is typical, with the full 4-capsule serving (303 mg) matching the UK reference intake of 300 mg. Men who train hard or sweat heavily often sit at the upper end of that range, within the 400 mg supplement guidance.
Magnesium glycinate dosage for men and women over 50
The UK reference intakes do not rise after 50, so the same 200 to 400 mg range applies to men and women over 50 [2]. The US RDA does not rise either: it stays at 420 mg for men and 320 mg for women from age 31 onwards [6]. Absorption tends to fall and medication use tends to rise with age, so it is worth checking with your GP or pharmacist if you take regular medicines, and our guide on who should not take magnesium lists the common interactions.
What Is Magnesium Glycinate and Why Is It Recommended?
Magnesium glycinate is magnesium bound to the amino acid glycine, and it is recommended because it is well absorbed and gentle on the stomach compared with cheaper forms such as magnesium oxide [1]. This chelated structure is why it is the form most often chosen for a daily supplement.
Because the body absorbs amino acids efficiently, chelation with glycine lets the magnesium use those same absorption pathways. In a study of patients with impaired absorption, magnesium diglycinate was absorbed better than magnesium oxide [1], and comparisons of commercial products have found organic forms more bioavailable than oxide [8][9]. That means useful amounts at sensible doses rather than mega-doses.
Magnesium itself is an essential mineral involved in more than 300 enzyme reactions, with roles in energy production, muscle and nerve function and the synthesis of protein and DNA [10]. It is also needed to activate vitamin D [11]. In the UK, authorised claims for magnesium include that it contributes to normal muscle function, normal functioning of the nervous system, normal psychological function and the reduction of tiredness and fatigue.
How Does Magnesium Glycinate Compare to Other Forms?
Magnesium glycinate carries less elemental magnesium per gram than oxide but is better absorbed and better tolerated, which is why the dose you need depends on the form as much as on you [1][9]. The table compares the common forms.
Magnesium Form Comparison
| Magnesium Form | Elemental Content | Bioavailability | Typically chosen for | Potential Side Effects |
|---|---|---|---|---|
| Magnesium Glycinate | Up to 14.1% (11% on our label) | High | Daily top-up, evening routines; gentle on the stomach | Generally well tolerated; high doses may cause mild diarrhoea [1] |
| Magnesium Oxide | ~60% | Low | Laxative and antacid use | Strong laxative effect, digestive upset |
| Magnesium Citrate | ~16% | Moderate to high | General top-up, occasional constipation | Diarrhoea, abdominal cramping |
| Magnesium L-Threonate | ~7% | Moderate to high | Studied for its uptake into the brain | Drowsiness, headaches in some people |
| Magnesium Malate | ~11 to 15% | Moderate | Daytime use | Generally well tolerated |
| Magnesium Taurate | ~9% | Moderate | Paired with taurine | Generally well tolerated |
As the table shows, magnesium oxide looks impressive on elemental content but absorbs poorly, so in practice it is used more as a laxative than to raise magnesium status [9]. Citrate absorbs reasonably well [8] but is also commonly used for constipation. For everyday intake with good absorption and minimal digestive issues, glycinate remains the dependable all-rounder. If you would rather have several forms in one, Magnesium Seven combines seven, including glycinate, citrate and malate, for 329 mg of elemental magnesium per 4 capsules.
When Is It Best to Take Magnesium Glycinate?
The best time to take magnesium glycinate is whenever you will take it consistently, with food; for sleep, take the main dose 30 to 60 minutes before bed. Taking it with a meal aids absorption and further reduces any chance of stomach upset [1].
If sleep is the priority, taking the bulk of the dose in the evening tends to suit people best. Glycine has been studied in its own right for sleep quality [12], and magnesium contributes to normal functioning of the nervous system and normal muscle function. Our full guide on whether to take magnesium glycinate in the morning or at night goes deeper.
Can I take magnesium glycinate twice a day?
Yes. Splitting the daily amount into a morning and an evening portion is a common way to keep magnesium levels consistent and the gut comfortable. With our capsules, that is 2 with breakfast and 2 with your evening meal or before bed. The total for the day stays the same; taking it twice a day does not mean taking twice as much.
If you are using it for daytime muscle function or energy, a morning or midday dose may suit you better, though some people find glycinate relaxing during the day and prefer the evening. Once you settle on a timing that works, keep it consistent. Most people need 8 to 12 weeks of daily use to judge the effect; see our realistic timeline for magnesium glycinate.
Can You Take Too Much Magnesium Glycinate?
Yes. Taking more than about 400 mg of elemental magnesium a day from supplements can cause diarrhoea, nausea and cramping, and the NHS says 400 mg or less a day from supplements is unlikely to cause harm [2]. Although glycinate is well tolerated, it is still possible to overdo it. In the US the upper limit is 350 mg a day of elemental magnesium from supplements [6], and the first sign of going over it is usually diarrhoea (diarrhea in US spelling).
The most common sign of too much is diarrhoea, because unabsorbed magnesium draws water into the bowel and produces a laxative effect [10]. In rare cases of very high intake, more serious effects such as irregular heartbeat, low blood pressure and confusion can occur, particularly in people with kidney conditions, because the kidneys are what clear excess magnesium. If you have a kidney condition, do not take magnesium supplements unless your doctor recommends them.
What is the maximum dose of magnesium glycinate per day?
The maximum dose of magnesium glycinate per day for healthy adults is generally taken as 400 mg of elemental magnesium from supplements, the UK guidance figure [2]. The US upper level is lower at 350 mg a day from supplements [6], and the EU sets 250 mg a day for readily dissociable magnesium salts and magnesium oxide [5]. These limits apply to supplements, not to magnesium from food.
Is 1000 mg of magnesium glycinate too much?
It depends which 1,000 mg you mean. 1,000 mg of magnesium glycinate compound is not too much for most adults: it contains only about 110 to 141 mg of elemental magnesium, below the usual daily range. 1,000 mg of elemental magnesium is too much: it is two and a half times the 400 mg a day the NHS says is unlikely to cause harm, and well above the US and EU upper levels.
Once again, separate the elemental magnesium from the compound weight and dose by the elemental figure. If you are considering more than 400 mg elemental per day, do it under professional guidance so your needs and any interactions can be assessed.
Is 500 mg of magnesium glycinate too much?
500 mg of magnesium glycinate compound is not too much: it supplies only about 55 to 71 mg of elemental magnesium. 500 mg of elemental magnesium is too much for most adults without medical advice, because it is above both the 350 mg US upper limit and the 400 mg UK guidance for supplements [6]. US labels make the difference easier to spot: the Supplement Facts panel lists magnesium in mg of elemental magnesium with a % Daily Value, and the FDA Daily Value for magnesium is 420 mg [6]. A serving showing about 120% DV or more is already above 500 mg elemental.
The same logic answers "can I take 240 mg of magnesium glycinate?" or "can I take 400 mg?": if the figure is elemental magnesium, 240 mg is well within range and 400 mg is at the top of it (above the US 350 mg upper limit, so check with your doctor); if it is the compound weight, both are small doses.
"When considering magnesium supplementation, particularly at higher doses, it is vital to consult your GP or a qualified nutritionist. They can help determine your specific needs, monitor for potential interactions, and ensure your chosen dosage is safe and effective for your unique health profile."
Sarah Law, Naturopathic Nutritionist & Functional Practitioner | Optimised Female
Which magnesium is right for you?
Frequently Asked Questions
How much magnesium glycinate should I take daily?
Most adults take 200 to 400 mg of elemental magnesium a day from magnesium glycinate, often split into a morning and an evening dose. Dose by the elemental figure on the label, not the compound weight. In the UK the NHS reference intake is 300 mg a day for men and 270 mg for women, and 400 mg or less a day from supplements is unlikely to cause harm. In the US, the NIH RDA is 400 to 420 mg a day for men and 310 to 320 mg for women, with an upper limit of 350 mg a day from supplements.
Is 1000 mg of magnesium glycinate too much?
1,000 mg of magnesium glycinate compound is not too much for most adults, because it contains only about 110 to 141 mg of elemental magnesium. 1,000 mg of elemental magnesium would be too much: it is two and a half times the 400 mg a day the NHS says is unlikely to cause harm from supplements.
Can I take 200 mg of magnesium glycinate?
Yes. 200 mg of elemental magnesium a day is a common starting dose and sits at the lower end of the usual 200 to 400 mg range. If the 200 mg on your label is the compound weight, it only supplies around 22 to 28 mg of elemental magnesium, which is a small dose.
Should I take 1 or 2 magnesium glycinate capsules?
It depends on how much elemental magnesium each capsule holds. One Love Life Supplements capsule provides about 76 mg of elemental magnesium, so 2 capsules give about 152 mg and the full 4-capsule serving gives 303 mg. Many people start on 1 or 2 and build up over one to two weeks.
Can I take magnesium glycinate twice a day?
Yes. Splitting your daily amount into a morning and an evening dose is common and can be easier on the stomach. Keep the total within your daily amount; taking it twice does not mean doubling it.
What is the maximum dose of magnesium glycinate per day?
For supplements, the NHS says 400 mg or less of elemental magnesium a day is unlikely to cause harm. The US upper level for supplemental magnesium is 350 mg a day and the EU level for readily dissociable magnesium salts is 250 mg a day. Go above these only on a professional's advice, and not at all with kidney problems unless your doctor agrees.
Is 500 mg of magnesium glycinate too much?
500 mg of magnesium glycinate compound is not too much, because it contains only about 55 to 71 mg of elemental magnesium. 500 mg of elemental magnesium a day is above the 350 mg US upper limit and the 400 mg UK guidance for supplements, so take that much only on a doctor's advice. On a US Supplement Facts label, magnesium is listed as elemental mg with a % Daily Value based on 420 mg.
References
- Schuette SA, Lashner BA, Janghorbani M. Bioavailability of magnesium diglycinate vs magnesium oxide in patients with ileal resection. JPEN J Parenter Enteral Nutr. 1994. PubMed 7815675
- NHS. Vitamins and minerals: Others (magnesium: how much you need, and taking too much). nhs.uk
- PubChem. Magnesium glycinate (CID 84645): formula C4H8MgN2O4, molecular weight 172.42. PubChem
- EFSA. Dietary Reference Values for nutrients: magnesium (adequate intake 2015). EFSA DRV Finder
- EFSA. Overview on Tolerable Upper Intake Levels as derived by the Scientific Committee on Food and the EFSA Panel on Dietetic Products, Nutrition and Allergies. EFSA (PDF)
- NIH Office of Dietary Supplements. Magnesium Fact Sheet for Health Professionals (RDA and tolerable upper intake levels). NIH ODS
- DiNicolantonio JJ, O'Keefe JH, Wilson W. Subclinical magnesium deficiency: a principal driver of cardiovascular disease and a public health crisis. Open Heart. 2018. PubMed 29387426
- Walker AF, Marakis G, Christie S, Byng M. Mg citrate found more bioavailable than other Mg preparations in a randomised, double-blind study. Magnes Res. 2003. PubMed 14596323
- Firoz M, Graber M. Bioavailability of US commercial magnesium preparations. Magnes Res. 2001. PubMed 11794633
- de Baaij JH, Hoenderop JG, Bindels RJ. Magnesium in man: implications for health and disease. Physiol Rev. 2015. PubMed 25540137
- Uwitonze AM, Razzaque MS. Role of Magnesium in Vitamin D Activation and Function. J Am Osteopath Assoc. 2018. PubMed 29480918
- Bannai M, Kawai N. New therapeutic strategy for amino acid medicine: glycine improves the quality of sleep. J Pharmacol Sci. 2012. PubMed 22293292
References checked against PubMed and the source pages on 13 October 2026.
The sleep and calm specialist: Magnesium Glycinate, fully reacted bisglycinate, 303 mg elemental magnesium per serving, UK-made and third-party tested.
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About the Reviewer: Sarah Law, Dip CNM
Sarah Law is a Certified Naturopathic Nutritionist and Functional Practitioner specialising in hormonal health, gut health, and evidence-based nutrition. She holds a Diploma in Naturopathic Nutrition from the College of Naturopathic Medicine (CNM, London) and is a Certified Functional Health Coach. Sarah combines naturopathic principles with modern functional nutrition science to help her clients make informed health decisions.
About the Author: Ben Law
Ben Law is the founder of Love Life Supplements and host of the Optimised Health Show. He is a self-confessed health, fitness and primal living fanatic and a qualified Advanced Dietary Supplement Advisor and Primal Blueprint Certified Expert. Over the last decade, Ben has helped thousands of UK customers optimise performance and recovery with transparent, research-led formulations manufactured to UK GMP and BRC standards.