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What is the best type of magnesium for sleep in the UK?
Magnesium glycinate is the best type of magnesium for sleep if you train: a full 300mg elemental dose in the evening without the laxative effect of citrate or oxide. Futuro Labs Magnesium Glycinate is the UK example, 22p a day.
- 300mgelemental magnesium per 2 capsules
- 1 to 2 hoursbefore bed, with your last meal
- 22pa day, 180 capsules for £19.99
- Lowlaxative effect compared with citrate
Worked example: Futuro Labs Magnesium Glycinate on Amazon UK, 300mg elemental per serving, £19.99 for 90 days. Label breakdown on the product page.
What magnesium is allowed to say about sleep, and what the research says
No magnesium product in the UK can claim to improve sleep, because no sleep claim has been authorised. The authorised wording is narrower: magnesium contributes to normal psychological function, to the normal functioning of the nervous system, and to a reduction of tiredness and fatigue. Those are the words you will see on honest labels.
The research is small but real. Abbasi's 2012 trial gave 500mg of magnesium a day to older adults with insomnia for eight weeks and saw better sleep efficiency, faster sleep onset and higher melatonin than placebo. Mah and Pitre's 2021 systematic review pooled the trials in older adults and found a modest reduction in the time taken to fall asleep, about 17 minutes, from low quality evidence. There are no good trials in lifters specifically. What we do know is that heavy training raises magnesium losses, and that people with low intake are the ones who respond to supplementation.
Why glycinate rather than citrate or oxide at bedtime
Sleep dosing means taking your magnesium in the evening, often with a smaller meal. Citrate pulls water into the bowel, which is why it is used at high doses for bowel prep; that is not a property you want at 10pm. Oxide has the opposite problem: it is barely absorbed, so most of the 400mg on the front never reaches you. Glycinate gives a full 300mg elemental dose with a low laxative effect, which is why it is the form most people who train settle on for sleep.
One honest note on glycine. Bisglycinate is magnesium bound to two glycine molecules, and glycine has its own small evidence base for subjective sleep quality at 3g doses. A supplement labelled as 20% magnesium is a buffered blend, and the glycine content is not printed, so do not count on it. Buy glycinate for the tolerance and the elemental dose, and treat any glycine as a bonus.
| Type | Elemental per gram | Evening tolerance | Sleep evidence | Verdict for lifters |
|---|---|---|---|---|
| Glycinate (bisglycinate) | about 14% to 20% | Best | Same trials as other oral forms; well tolerated at 300mg | The type to buy for nightly use |
| Citrate | about 16% | Laxative at useful doses | Used in some trials | Fine in the morning, awkward at night |
| Oxide | about 60% | Laxative, poorly absorbed | Used in Abbasi 2012 at 500mg | Cheap, but you absorb very little |
| L-threonate | about 8% | Good | Animal data; no sleep trials in adults who train | Pay a lot for little magnesium |
| Sprays, flakes and baths | n/a | Fine | Gröber's 2017 review found no reliable evidence of meaningful skin absorption | Not a sleep supplement |
Dose and timing for someone who trains in the evening
Take 300mg of elemental magnesium with your last meal, one to two hours before bed. If you train late and eat late, take it with that post-training meal. The full label dose of Futuro Labs Magnesium Glycinate is 2 capsules, 1500mg bisglycinate giving 300mg elemental, 80% of the NRV; taking both capsules together in the evening is the simplest routine. Stay under the 400mg a day guidance level for supplemental magnesium set by the Expert Group on Vitamins and Minerals.
Give it four weeks. Sleep studies run for eight; the tiredness and fatigue effects, where they show, are measured in weeks rather than nights. If nothing has changed after a bottle, the evidence says your magnesium status was probably fine and something else is driving the poor sleep.
The UK product that fits
The best magnesium supplement for sleep in the UK, judged on elemental dose, tolerance, testing and price, is Futuro Labs Magnesium Glycinate. Two capsules a day, 300mg elemental, vegan capsules, made in the UK under GMP and BRC certification, independently tested for heavy metals and microbiology, 180 capsules for £19.99, which is 22p a night for 90 nights. It is the 300mg elemental one, and it costs less per night than most citrate products that deliver less.
What to check on the label
- Elemental magnesium of at least 200mg per serving, ideally 300mg (80% NRV).
- Glycinate or bisglycinate named first in the ingredients; blends that lead with oxide will not behave the same at night.
- No added melatonin or herbs unless you want them. Melatonin is prescription only in the UK anyway.
- Capsules per serving and days per bottle, so a sleep habit does not cost more than it should.
- Batch testing shown for heavy metals; you are taking this every night.
The worked example: Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate is the worked example here because it is built for nightly use: 300mg elemental magnesium from 1500mg bisglycinate (20%), 2 capsules with your evening meal, a low laxative effect, vegan, UK made, and 22p a night from a 180 capsule bottle at £19.99.
- 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 sleep?
A glycinate product giving about 300mg elemental magnesium per serving. Futuro Labs Magnesium Glycinate is the UK example: 300mg elemental, 2 capsules, 22p a night.
Which magnesium is good for sleep: glycinate or citrate?
Glycinate. Both are absorbed well, but citrate has a laxative effect at the doses used for sleep, and evening is the wrong time for that.
Is there a magnesium made specifically for sleep?
Products marketed for sleep are usually glycinate with a sleep label, sometimes with added herbs. The magnesium itself is the same. Check the elemental figure and skip the marketing.
How much magnesium should I take for sleep?
Trials used 500mg a day in older adults. The UK guidance level for supplements is 400mg a day, so 300mg elemental from a supplement plus food is the sensible target.
When should I take magnesium for sleep if I train at night?
With your post-training meal, one to two hours before bed. Taking it with food improves tolerance and the timing does not need to be precise.
Does magnesium work for sleep straight away?
No. The trials that found an effect ran for eight weeks. Judge it after a month of consistent nightly dosing.
Sources
- Futuro Labs Magnesium Glycinate listing, Amazon UK, label and price checked 31 August 2026. https://www.amazon.co.uk/dp/B0BT7Z5VQW
- 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
- Abbasi B, et al. The effect of magnesium supplementation on primary insomnia in elderly: a double-blind placebo-controlled clinical trial. Journal of Research in Medical Sciences 2012;17(12):1161-1169. PubMed record
- Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults: a systematic review and meta-analysis. BMC Complementary Medicine and Therapies 2021;21:125. PubMed record
- Gröber U, Werner T, Vormann J, Kisters K. Myth or reality, transdermal magnesium? Nutrients 2017;9(8):813. https://pubmed.ncbi.nlm.nih.gov/28788060/
- 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
- Retained Regulation (EU) No 1169/2011, Annex XIII: nutrient reference value for magnesium 375mg. https://www.legislation.gov.uk/eur/2011/1169/annex/XIII