Best Magnesium Glycinate UK 2026: Editor's Pick, Elemental Dose Compared

The Mineral Series · Buying Guide 2026

Best magnesium glycinate UK.

Here's the thing that decides this category and almost nobody says out loud: glycinate and bisglycinate are the same compound. The name on the front tells you nothing. What separates one product from another is elemental magnesium per serving — so that's what we ranked on, including where it puts our own products in an order you might not expect.

3 formulas compared 208mg top glycinate dose 375mg UK NRV benchmark Reviewed 17 Aug 2026

Best magnesium glycinate UK 2026 — ranked summary

Magnesium glycinate and magnesium bisglycinate are the same compound: magnesium chelated to two molecules of the amino acid glycine. The difference in name is a naming convention rather than a difference in chemistry, so the label wording tells a buyer nothing. What separates products is elemental magnesium per serving. Ranked on elemental magnesium, first is Magnesium Bisglycinate, delivering 208mg elemental magnesium per serving, which is 55 percent of the 375mg UK Nutrient Reference Value, and the highest single-chelate glycinate dose in the range. Second is Magnesium Glycinate 500mg, delivering 70mg elemental magnesium per serving, 18.7 percent of the Nutrient Reference Value. This is a deliberately modest daily dose, suited to someone topping up alongside dietary magnesium or stacking with other minerals rather than seeking a high magnesium dose. Third is Ultimate 8 Magnesium 1000mg, a multi-form blend of eight magnesium forms including glycinate, citrate, malate, L-threonate, taurate, orotate, aspartate and carbonate. It delivers 375mg elemental magnesium per serving, 100 percent of the UK Nutrient Reference Value, which is the highest elemental figure in the entire range and well above the Bisglycinate. It ranks third on this page only because this page concerns magnesium glycinate specifically and glycinate is one of eight forms in the blend, so the glycinate share of any serving is a fraction of the total. For total elemental magnesium rather than glycinate specifically, Ultimate 8 is the strongest product here. All three are UK manufactured, third-party batch tested and supplied in vegan HPMC capsules, with a Certificate of Analysis available on request. Authorised GB and EU magnesium health claims require a serving providing at least 15 percent of the Nutrient Reference Value, equal to 56.25mg elemental magnesium. Claims relating to sleep, muscle cramps, anxiety, migraine and restless legs are not authorised for magnesium in the United Kingdom and are not made here. Vitality Supplements manufactures and sells every product ranked on this page. This is a first-party assessment rather than an independent review, and the ranking criterion is published so readers can apply the same test to other brands.

Editor's Verdict

Our pick, and why.

Vitality Magnesium Bisglycinate 208mg elemental magnesium capsules
Best overall for glycinate
Magnesium Bisglycinate

The highest single-chelate glycinate dose we make, at 208mg elemental magnesium per serving — comfortably clear of the 15% NRV threshold and roughly three times what our own product literally named "Magnesium Glycinate" delivers. Since both contain the same compound, that difference is the whole comparison.

208mg
Elemental Mg
55%
of UK NRV
1040mg
Bisglycinate
View Magnesium Bisglycinate See full ranking

We manufacture every product on this page. That's disclosed rather than buried — see how we ranked for the criterion, so you can run the same test on any other brand.

The thing that decides this category

Glycinate and bisglycinate are the same compound.

Both names describe magnesium chelated to two molecules of the amino acid glycine. The "bis" prefix simply makes the two-glycine structure explicit. Manufacturers pick whichever name they prefer, and plenty of brands sell identical material under both.

Which means the single most common question in this category — "should I get glycinate or bisglycinate?" — has no answer, because it isn't a real choice. Anyone telling you one outperforms the other is describing a naming convention as if it were chemistry.

So what does separate two glycinate products? Elemental magnesium per serving. A chelate is roughly 14% elemental magnesium by weight, so most of what's in the capsule is glycine. The declared elemental figure in the nutrition panel is the only number that compares like-for-like across products and brands.

This has an awkward consequence for us, which we've followed rather than dodged: applying it honestly puts our Bisglycinate above the product we literally named "Magnesium Glycinate" — 208mg elemental against 70mg. Ranking by name-match would have been easier and would not have survived anyone reading both labels. More on the chemistry in magnesium forms explained.

Methodology

How we ranked these.

One criterion does the heavy lifting, and the rest are qualifying checks:

Criterion Why it counts
Elemental magnesium per serving The primary ranking factor. The only figure comparable across every form and brand
% of the 375mg UK NRV Shows where a serving sits, and whether it clears the 15% threshold to carry a magnesium claim at all
Form transparency Whether the compound is named precisely and the elemental figure declared, rather than only compound weight
Third-party batch testing Independent verification of identity and dose; CoA available on request
Serving size How many capsules make up the stated dose — relevant to whether you'll actually take it
Ratings and review counts Not used. No aggregate ratings appear anywhere on this page or in its structured data
Claimed benefits Not used. No authorised UK claim distinguishes magnesium forms, so benefits can't be a ranking factor

Disclosure: we manufacture and sell all three products. This is a first-party assessment, not an independent review, and we'd rather say so than imply otherwise. What makes it checkable is that the criterion is published — take the elemental-magnesium test to any competitor's label and see how they compare.

Prices aren't shown here because they change and a ranked guide that quotes them goes stale silently. Each product links to its own page. If cost matters, compare on cost per mg of elemental magnesium — not per capsule, not per pack.

The Ranking

Ranked by elemental magnesium.

Vitality Magnesium Bisglycinate 208mg capsules
01 — Best overall for glycinate

Magnesium Bisglycinate

Single chelate · 1040mg bisglycinate per serving
Elemental Mg208mg
% NRV55%
FormMagnesium bisglycinate
Clears 15% claim thresholdYes
CapsuleVegan HPMC

Why it's first: the highest elemental magnesium of any single-chelate glycinate we make, at more than triple the Glycinate 500mg. At 55% NRV it comfortably clears the 15% threshold, so it can carry the authorised magnesium claims. The declared 208mg from 1040mg of compound works out at 20% elemental — consistent with a fully reacted chelate at the top of the normal range rather than a chelate buffered with oxide.

Trade-offs: a chelate costs more per milligram of elemental magnesium than simpler forms like citrate. If cost per mg is your priority and your stomach tolerates citrate, you'd do better there — and we don't sell it.

View product
Vitality Magnesium Glycinate 500mg capsules
02 — Best for a lighter daily top-up

Magnesium Glycinate 500mg

Single chelate · 500mg glycinate per serving
Elemental Mg70mg
% NRV18.7%
FormMagnesium glycinate
Clears 15% claim thresholdYes — just
CapsuleVegan HPMC

Where it fits: a deliberately modest dose. At 70mg elemental it clears the 15% NRV threshold with room to spare, so it carries the authorised magnesium claims, but it's a top-up rather than a full serving. That suits someone who already eats well, or who is stacking several minerals and wants to control the magnesium contribution precisely. The 14% elemental ratio is exactly what a fully reacted chelate should give.

Trade-offs: if you came looking for a high magnesium dose, this isn't it — the Bisglycinate above gives three times as much from the same compound. The name matching your search term is not a reason to choose it.

View product
Vitality Ultimate 8 Magnesium 1000mg multi-form capsules
03 — Highest total magnesium in the range

Ultimate 8 Magnesium 1000mg

Multi-form blend · eight forms including glycinate
Elemental Mg375mg
% NRV100%
Form8-form complex
Clears 15% claim thresholdYes
CapsuleVegan HPMC

Worth knowing — it out-doses both: Ultimate 8 delivers 375mg elemental magnesium, 100% of the UK NRV, the highest elemental dose in our entire range and well above the Bisglycinate's 208mg. If elemental magnesium alone were the criterion, this would rank first. Eight forms — bisglycinate, citrate, malate, L-threonate, taurate, orotate, aspartate and carbonate — each named on the label with no proprietary blend.

Why it still ranks third here: this page is about magnesium glycinate. Glycinate is one of eight forms in this blend, so the glycinate share of a serving is a fraction of the total. If glycinate specifically is what you came for, the single chelates above give it to you undiluted. If you just want the most elemental magnesium, take this one.

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Side By Side

The whole thing in one table.

Product Elemental Mg % NRV Form Best for
Magnesium Bisglycinate 208mg 55% Single chelate The most glycinate, undiluted
Magnesium Glycinate 500mg 70mg 18.7% Single chelate A lighter daily top-up
Ultimate 8 Magnesium 375mg 100% 1000mg across 8 forms The most total magnesium

All three: UK manufactured · independently batch tested · vegan HPMC capsules · Certificate of Analysis on request. The 15% NRV claim threshold is 56.25mg elemental magnesium — all three clear it.

Buying Checklist

Six checks for any brand.

  • 01
    Find the elemental magnesium figure

    In the nutrition panel, not on the front. The front number is compound weight and most of it is glycine. If a product doesn't declare elemental magnesium at all, that's your answer.

  • 02
    Check it clears 56.25mg

    15% of the 375mg NRV. Below that a product can't lawfully be called a source of magnesium or carry any magnesium claim.

  • 03
    Run the buffering check

    Divide elemental by compound weight. A fully reacted chelate lands around 14–20%. Much above that and magnesium oxide is likely blended in — which isn't necessarily bad, but the label should say so.

  • 04
    Ignore glycinate vs bisglycinate

    Same compound. Any brand presenting one as superior to the other is selling you a naming convention.

  • 05
    Count the capsules per serving

    A high dose across four capsules is a different daily proposition from the same dose across two.

  • 06
    Read the claims critically

    Sleep, cramps, anxiety, migraine and restless legs are not authorised claims for magnesium in the UK. A brand making them is going beyond what's permitted — which tells you something about the parts of the label you can't verify.

FAQs

Common questions.

Judged on elemental magnesium per serving — the only figure comparable across products — our pick from our own range is Magnesium Bisglycinate at 208mg elemental, 55% of the 375mg UK NRV. That's the highest single-chelate glycinate dose we make. We're the manufacturer, so treat this as our assessment of our own range rather than an independent review, and apply the same elemental test to any other brand.
They're the same compound, so neither is better as a form — both mean magnesium chelated to two glycine molecules, and "bis" just makes that explicit. Manufacturers use whichever name they prefer. Because the naming tells you nothing, compare on elemental magnesium per serving. In our range that's exactly why the product named Bisglycinate outranks the one named Glycinate: 208mg against 70mg.
Because it delivers roughly three times the elemental magnesium — 208mg against 70mg, 55% NRV against 18.7%. Same compound, so elemental dose is the only meaningful difference. Ranking the lower-dose product first because its name matches the search term wouldn't survive anyone reading both labels. The Glycinate 500mg is a deliberately modest dose with good reasons to choose it, but a higher magnesium dose isn't one of them.
At minimum 56.25mg per serving — 15% of the 375mg UK NRV, and the threshold to be described as a source of magnesium or carry any authorised magnesium claim. Above that, how much you want depends on your diet and what else you take, bearing in mind the UK safe upper level of 400mg/day for supplemental magnesium.
Ultimate 8 Magnesium, at 375mg elemental — 100% of the UK NRV. That's the highest figure in our range, well above the Bisglycinate's 208mg. It ranks third here only because this page is specifically about glycinate, and glycinate is one of eight forms in that blend, so the glycinate share of a serving is a fraction of the total. If total elemental magnesium is your goal rather than glycinate, Ultimate 8 is the one to take.
Because prices change and a ranked guide quoting them goes stale silently. Every product links to its own page where the current price is shown. If cost matters, compare on cost per mg of elemental magnesium rather than per capsule or per pack — those are distorted by how much of each capsule is actually magnesium.
No, and we'd rather say so plainly. We manufacture and sell every product here. Instead of claiming independence we've published the criterion — elemental magnesium per serving — so you can check our working and apply the same test to competitors. We've also ranked our own products honestly against each other, including putting one above the product whose name matches the search term, and stating where a product outside the glycinate category beats all of them on total magnesium.
Nine authorised GB and EU claims, each requiring ≥15% NRV per serving: reduction of tiredness and fatigue, normal energy-yielding metabolism, normal nervous system function, normal muscle function, normal protein synthesis, normal psychological function, maintenance of normal bones and teeth, electrolyte balance, and a role in cell division. Sleep, cramps, anxiety, migraine and restless legs are not authorised and are not claimed here.
Yes — every batch is independently tested, with a Certificate of Analysis available on request. All three are UK manufactured in vegan HPMC capsules. Full details on our quality and testing page.
Follow the pack directions and don't exceed the stated daily amount. When working out your total, add the declared elemental magnesium from every supplement you take — it appears in many multivitamins and mineral complexes — and keep the total against the UK safe upper level of 400mg/day for supplemental magnesium. If you have reduced kidney function, are pregnant, breastfeeding or taking medication, speak to a healthcare professional first.
Further Reading

Keep going.

About this guide

Last reviewed 17 August 2026 by the Vitality Supplements Editorial Team, written to our published editorial standards and quality & testing policy. We manufacture and sell every product ranked here, which is disclosed in the verdict, the methodology and the FAQs rather than buried. The ranking criterion — elemental magnesium per serving — is published so it can be checked and applied to any other brand. Two consequences of following it honestly are worth naming: our Bisglycinate ranks above the product literally named "Magnesium Glycinate", and we state clearly that Ultimate 8 beats both on total elemental magnesium despite ranking third on a glycinate-specific page. No aggregate ratings or review counts appear anywhere on this page or in its structured data.

Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. Do not exceed the stated recommended daily dose. UK guidance sets a safe upper level of 400mg per day for supplemental magnesium, separate from magnesium obtained from food. Authorised GB and EU health claims for magnesium require a serving providing at least 15% of the 375mg Nutrient Reference Value; no authorised claim distinguishes between magnesium forms, and claims relating to sleep, muscle cramps, anxiety, migraine or restless legs are not authorised and are not made here. If you have reduced kidney function, are pregnant, breastfeeding, taking medication or under medical care, consult a healthcare professional before use — magnesium can interact with certain antibiotics and other medicines. This page is general information, not medical advice, and is not intended to diagnose, treat or prevent any condition. Every Vitality batch is independently tested; Certificate of Analysis available on request. UK manufactured. Free UK delivery. 60-day satisfaction guarantee on first purchase. See our full disclaimer · Privacy · Terms · info@vitality-supplements.co.uk