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Should I take magnesium citrate or glycinate for leg cramps?
For leg cramps, take glycinate: the honest review found magnesium unlikely to help typical night leg cramps, but the trials leaned on poorly absorbed forms, and a fair month-long test needs 300mg elemental held daily, which glycinate manages.
- Night-timewhen idiopathic leg cramps strike, and when dosing happens
- 300mgelemental daily, the fair test's requirement
- 1 monthbaseline week included, before the verdict
- 22pa day for the form that fits the night
The night-friendly form: Futuro Labs Magnesium Glycinate on Amazon UK, 180 capsules for £19.99. Label breakdown. The restless legs distinction is on the restless legs page.
Night leg cramps: what they are, and what the evidence says
The classic leg cramp arrives at night: a calf or foot seizing hard enough to wake you, common from middle age onward, in pregnancy, and after unaccustomed exercise, usually with no cause a doctor can find, which is what idiopathic means. This is precisely the population Garrison's 2020 Cochrane review examined, and its verdict is the honest headline: magnesium is unlikely to make a meaningful difference to idiopathic leg cramps. Two footnotes keep the question alive for a specific reader. The pooled trials leaned on oxide and other poorly absorbed salts, so delivered doses were often small; and participants were not selected for low magnesium intake, the one group with a mechanism in play. Quinine, the old prescription answer, has retreated on safety grounds, which is why the supplement aisle inherited the question.
Why the night-time shape of the problem picks glycinate
Leg cramps are a bedtime problem, and the sensible dosing slot is the evening meal, which immediately stresses citrate's weakness: 300mg of citrate after dinner is an osmotic dose scheduled to negotiate with your bowel overnight, the exact hours the cramps already own. Glycinate takes the full 300mg inside dinner with nothing left behind, covers the night, and repeats for the month the test needs. Citrate keeps its usual honourable fallback, 100mg to 200mg with breakfast for someone who also wants morning regularity, with the evening left to the chelate. Same mineral, same modest odds; the form choice is about running the test in the right slot without adding a second night-time problem.
| Intervention | Evidence position | Verdict |
|---|---|---|
| Stretching the calf when it strikes | Standard, reliable in the moment | The actual treatment, every time |
| Regular calf stretching before bed | Mixed but low-cost trials | Worth the two minutes |
| Magnesium glycinate, 300mg elemental with dinner | Review negative overall; fair-test caveat for low intake | The month test, run properly |
| Magnesium citrate at night | Same mineral, osmotic timing problem | No; mornings only, part-doses |
| Quinine | Withdrawn from routine use on safety | A GP conversation, not a purchase |
| Hydration, easy evening walk | Sensible, low evidence | Free, keep them |
The month test at night, and the red flags that skip it
Count cramps for a baseline week. Then Futuro Labs Magnesium Glycinate, 2 capsules with the evening meal nightly: 300mg elemental at 80% NRV from bisglycinate at 20%, vegan, UK made under GMP and BRC, panels shown, £19.99 for 180 capsules, 22p a day, alongside a two-minute calf stretch before bed. Judge at week four: fewer night wakings in someone whose diet ran narrow is the low-intake mechanism resolving; no change means magnesium was not your cause, and the honest next steps are the stretching habit and a GP chat if the cramps still cost you sleep. Go to the GP first, not the shelf, if cramps are frequent and severe, one-sided, spreading, tied to new medication such as statins or diuretics, or accompanied by swelling, weakness or skin changes, and mention pregnancy separately, where cramps are common and advice is individual. Citrate or glycinate for leg cramps: glycinate, because the night owns this problem and glycinate is the form that can work nights.
What to check on the label
- Honest odds first: the review is negative for typical night leg cramps.
- The fair-test caveat: poorly absorbed forms and unselected participants weaken the trials.
- Glycinate with dinner runs the test in the right slot; citrate stays a morning tool.
- Stretch the calf in the moment and before bed: the reliable parts of the kit.
- Red flags to a GP first: one-sided, severe, medication-linked, or with swelling or weakness.
The worked example: Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate is the night-slot form for the month test: 300mg elemental per 2 capsules (80% NRV) from bisglycinate 20%, with dinner, vegan, UK made, panels shown, 22p a day from a £19.99 bottle of 180.
- 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
Which is better for leg cramps, magnesium citrate or magnesium glycinate?
Glycinate: leg cramps are a night problem, the dose slot is dinner, and glycinate holds the full 300mg there without citrate's overnight bowel effect.
Does magnesium actually stop night leg cramps?
The Cochrane review says unlikely for typical cases. The fair-test caveat, poor forms and unselected participants, leaves a month of proper dosing worth running once.
What should I do when a leg cramp wakes me?
Straighten the leg and pull the toes up to stretch the calf; it releases in under a minute. A pre-bed calf stretch may reduce repeats.
Are leg cramps a magnesium deficiency sign?
They can be part of the low-intake cluster with twitching and tiredness, but most night leg cramps have no found cause. The month test is how you find out.
When should leg cramps see a doctor?
When frequent and severe, one-sided, spreading, linked to new medication, or accompanied by swelling, weakness or skin changes, and during pregnancy for tailored advice.
Sources
- Futuro Labs Magnesium Glycinate listing, Amazon UK, label and price checked 31 August 2026. https://www.amazon.co.uk/dp/B0BT7Z5VQW
- Garrison SR, Korownyk CS, Kolber MR, et al. Magnesium for skeletal muscle cramps. Cochrane Database of Systematic Reviews 2020, Issue 9, CD009402. PubMed record
- Gröber U, Schmidt J, Kisters K. Magnesium in prevention and therapy. Nutrients 2015;7(9):8199-8226. PubMed record
- Firoz M, Graber M. Bioavailability of US commercial magnesium preparations. Magnesium Research 2001;14(4):257-262. PubMed record
- 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