Ghost FitnessGhost Fitness/Magnesium/How do I know what kind of magnesium I need?
How do I know what kind of magnesium I need?
Match the magnesium to the job. Daily intake for training, sleep and muscles: bisglycinate, 300mg elemental, evening. Regularity: citrate, mornings. Neither needed if greens, nuts, beans and wholegrains fill your week. Nothing else on the shelf earns a place.
- 3 endingsbisglycinate, citrate, or nothing
- 300mgelemental, the daily figure if you supplement
- 4 food groupsgreens, nuts and seeds, beans, wholegrains: the no-supplement diet
- 22pa day for the bisglycinate ending
The bisglycinate ending: Futuro Labs Magnesium Glycinate on Amazon UK, 180 capsules for £19.99. Label breakdown.
Step one: do you need any magnesium at all?
Count the week, not the day. If most days include a portion of green vegetables, a handful of nuts or seeds, some beans or lentils, and wholegrain bread, oats or brown rice, your food is close to the 300mg reference intake for men or 270mg for women, and a supplement adds little. The case for supplementing is built from the other direction: a diet that leans on meat, white rice, eggs and protein powder; heavy sweating from training, which raises losses as Nielsen and Lukaski's review documents; regular alcohol; and the soft signs of a low intake, which are tiredness out of proportion to training, cramps, twitching and poor sleep. No blood test settles it, because serum magnesium stays normal until stores are badly down; the diet count and the signs are the practical evidence.
Step two: what is the job?
If the job is daily intake, the background magnesium behind training, sleep quality, muscle function and less tiredness, the kind is bisglycinate: 300mg elemental in 2 capsules, absorbed well, no laxative effect, taken with the evening meal, every day including rest days. If the job is regularity, the kind is citrate: 100mg to 200mg elemental in the morning, using the osmotic effect on purpose, with the daily supplement total kept under the 400mg guidance level. Those are the only two jobs a form actually changes. Every other kind on the shelf is either the wrong tool, oxide and the antacid forms, or a premium retelling of the same mineral, malate, taurate and threonate, none of which has a human trial advantage over the two workhorses.
| Your situation | The kind you need | Dose and timing |
|---|---|---|
| Diet covers the four food groups most days, no symptoms | None | Spend the money on food |
| Training hard, narrow diet, tired, cramping or sleeping badly | Bisglycinate | 300mg elemental, evening meal, daily |
| Constipation-prone, wants help in the morning | Citrate | 100mg to 200mg elemental with breakfast |
| Both of the above | Bisglycinate evening plus small citrate morning | Keep the total under 400mg a day |
| Sensitive gut, IBD, or on regular medication | Bisglycinate, after a pharmacist or GP conversation | Start with 1 capsule, build to 2 |
| Chasing sleep, calm, energy or testosterone from a special form | None of the boutique forms | The claims belong to magnesium itself; buy the dose, not the story |
The signs you picked wrong, and how to correct
Loose bowels within a day or two means the dose or form is too osmotic for you: move citrate to the morning, halve it, or switch to bisglycinate. Nothing felt after a month of bisglycinate at 300mg means your intake was probably fine all along; stop, save the 22p, and revisit only if the diet narrows. Symptoms that made you buy the bottle persisting past a month, tiredness, cramps, twitching, poor sleep, mean the cause was never magnesium: sleep debt, training load, caffeine and stress are the usual suspects, and a GP is the right next step if they carry on regardless. The worked example for the bisglycinate ending is Futuro Labs Magnesium Glycinate: 300mg elemental from 1500mg bisglycinate at 20% in 2 capsules, 80% NRV, test panels shown, vegan, made in the UK under GMP and BRC certification, 180 capsules for £19.99, 22p a day.
What to check on the label
- The week's diet counted honestly: four food groups most days may mean no supplement.
- The job named: daily intake means bisglycinate, regularity means citrate.
- 300mg elemental with 80% NRV printed on whichever you buy.
- Total under 400mg a day if you run both forms.
- A month, then a verdict: keep, stop, or see a GP about the symptom.
The worked example: Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate is the bisglycinate ending of the decision path: 300mg elemental per 2 capsules (80% NRV), evening friendly, test panels shown, vegan, UK made, 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
How do I know if I need magnesium glycinate or citrate?
Name the job. Daily intake behind training and sleep: glycinate, evening. Regularity: citrate, morning. Both jobs: both forms, total under 400mg.
What are the signs I need magnesium?
A narrow diet plus tiredness, cramps, twitching or poor sleep. No routine blood test confirms it; a month at 300mg elemental is the practical test.
Can I just get magnesium from food?
Yes, if greens, nuts and seeds, beans and wholegrains appear most days. That is the best ending of the decision path.
Do I need a special magnesium for sleep or stress?
No. The claims belong to magnesium itself, not to a form. Bisglycinate is preferred at night only because it is tolerated at a full dose.
What kind of magnesium should I avoid?
Oxide and the antacid forms as daily sources, unprinted blends, and sprays counted as intake. The avoid list has its own page.
Sources
- Futuro Labs Magnesium Glycinate listing, Amazon UK, label and price checked 31 August 2026. https://www.amazon.co.uk/dp/B0BT7Z5VQW
- Department of Health. Dietary Reference Values for Food Energy and Nutrients for the United Kingdom. Report on Health and Social Subjects 41, 1991 (magnesium RNI 300mg men, 270mg women).
- Nielsen FH, Lukaski HC. Update on the relationship between magnesium and exercise. Magnesium Research 2006;19(3):180-189. 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