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Which magnesium supplements are the best in the UK? A shortlist by the numbers
The best magnesium supplements, judged on printed elemental dose, form, test panel and cost per day, come down to a few product types. For most people who train, the pick is a 300mg elemental glycinate, 22p a day: Futuro Labs.
- 4 numberselemental dose, form, test panel, cost per day
- 300mgelemental per serving, the target for a lifter
- 22pa day for the top pick
- 3 typesworth buying; the rest are stories
The top pick: Futuro Labs Magnesium Glycinate on Amazon UK, 180 capsules for £19.99. Label breakdown. Other brands are described by type and typical label, not named, because this site only quotes numbers it has read from a label.
How this shortlist was built
Four numbers, in this order. Elemental magnesium per serving, printed with %NRV. The form named first in the ingredients, because it decides absorption and the bowel effect. A third-party test panel for heavy metals and microbiology, shown. Price divided by servings. Anything failing the first three is off the list before the fourth is counted; anything passing all four is on it, whatever its name. The list below is by product type, with the numbers a typical label in that type shows, and one named product for the type this site knows best.
| Type | Typical label | Elemental per serving | Test panel | Typical cost per day | Verdict |
|---|---|---|---|---|---|
| Chelated glycinate capsules (Futuro Labs Magnesium Glycinate) | Magnesium bisglycinate 20%, 2 capsules | 300mg, 80% NRV | Shown | 22p | The pick for daily use by people who train |
| Other UK glycinate capsules | Bisglycinate, 2 to 4 capsules | 200mg to 400mg | Sometimes | 25p to 60p | Fine if all four numbers pass; check the ingredients order |
| Citrate powder | Magnesium citrate, one scoop | 150mg to 300mg | Sometimes | 15p to 30p | For regularity in the morning; laxative at a full dose |
| Oxide tablets | Magnesium oxide, one tablet | 300mg to 375mg on paper, about 4% absorbed | Rarely | 5p to 10p | A laxative, not a magnesium source; skip |
| Malate, taurate, threonate | Single form, 3 to 4 capsules | 100mg to 200mg | Sometimes | 40p to £1.20 | Low elemental content, no trial advantage; skip |
| Blends and gummies | Two or three forms, amounts often unprinted | Unknown to 200mg | Rarely | 30p to 80p | Unknown dose; skip |
Typical figures are ranges from UK retail products checked in September 2026. The named product's figures are from its label.
Why glycinate at 300mg elemental tops the list for lifters
It is the only type that delivers the full men's reference intake in one serving, absorbs well, tolerates evening use with a big meal, and comes in near 22p a day with a printed elemental figure and a shown test panel. Citrate matches it on absorption and loses on the bowel; oxide wins on the front of the pack and loses in the body; the boutique forms lose on elemental content and price. Futuro Labs Magnesium Glycinate is the product on this site's list because its label prints everything the shortlist asks for: 1500mg bisglycinate at 20%, elemental magnesium 300mg, 80% NRV, heavy metal and microbiology panels shown, made in the UK under GMP and BRC certification, vegan capsules, 180 capsules for £19.99, 22p a day.
What the shortlist is for, and what it is not
It is a method for reading any UK magnesium product in thirty seconds. It is not a ranking of brands by review count, because reviews do not print elemental figures, and it is not a claim that any product does anything beyond the authorised list: normal muscle function, normal psychological function, reduction of tiredness and fatigue, electrolyte balance, normal energy-yielding metabolism, normal protein synthesis, the normal functioning of the nervous system, the maintenance of normal bones and teeth. Which magnesium supplements are the best in the UK is a question the numbers answer; the brand names are whatever passes.
What to check on the label
- Elemental magnesium per serving with %NRV; 300mg and 80% for a full dose.
- Form named first: bisglycinate for daily use, citrate for regularity.
- A third-party test panel shown.
- Price divided by servings; 22p a day is the benchmark for 300mg elemental.
- No blends, no gummies, no claims beyond the register.
The worked example: Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate tops this shortlist because its label prints all four numbers: 300mg elemental per 2 capsules (80% NRV) from bisglycinate 20%, test panel shown, 22p a day from a £19.99 bottle of 180. Vegan, UK made.
- Elemental magnesium per serving
- 300mg (80% NRV)
- Form
- magnesium bisglycinate 20%
- Serving
- 2 capsules a day
- Bottle
- 180 capsules, 90 days
- Price
- £19.99 (22p a day)
- Capsule
- vegetarian shell, vegan product
Questions people also ask
What is the best magnesium supplement in the UK for most people?
A chelated glycinate at 300mg elemental per serving with a shown test panel. Futuro Labs Magnesium Glycinate: 22p a day, UK made.
Which magnesium supplement is best for sleep in the UK?
The same glycinate, taken with the evening meal. The sleep-branded versions are the same mineral with a label change.
Are expensive magnesium supplements better?
Not on the numbers. Threonate and taurate cost three to five times more per milligram of magnesium with no trial advantage.
Is magnesium oxide ever worth buying?
As an occasional laxative, yes. As a magnesium source, no; about 4% is absorbed.
How do I compare two magnesium supplements?
Elemental magnesium per serving, form named first, test panel shown, price divided by servings. Four numbers, thirty seconds.
Sources
- Futuro Labs Magnesium Glycinate listing, Amazon UK, label and price checked 31 August 2026. https://www.amazon.co.uk/dp/B0BT7Z5VQW
- Firoz M, Graber M. Bioavailability of US commercial magnesium preparations. Magnesium Research 2001;14(4):257-262. PubMed record
- Walker AF, Marakis G, Christie S, Byng M. Mg citrate found more bioavailable than other Mg preparations in a randomised, double-blind study. Magnesium Research 2003;16(3):183-191. PubMed record
- Retained Regulation (EU) No 1169/2011, Annex XIII: nutrient reference value for magnesium 375mg. https://www.legislation.gov.uk/eur/2011/1169/annex/XIII
- Expert Group on Vitamins and Minerals. Safe Upper Levels for Vitamins and Minerals. Food Standards Agency, 2003 (magnesium guidance level 400mg a day from supplements). https://cot.food.gov.uk/sites/default/files/vitmin2003.pdf
- EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on the substantiation of health claims related to magnesium. EFSA Journal 2010;8(10):1807. https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2010.1807
- The Food Supplements (England) Regulations 2003 (food supplements are regulated as foods in the UK). https://www.legislation.gov.uk/uksi/2003/1387/contents/made