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How much elemental magnesium per day?

By George Thomas. Published 14 September 2026, updated 14 September 2026. Label figures and prices checked on the update date.

Take 300mg elemental magnesium per day from a supplement on a narrow diet. The body needs 300mg for men, 270mg for women, from all sources; the supplement ceiling is 400mg. In glycinate, 300mg elemental is two capsules of 20% material.

300mg and 270mgelemental a day the body needs, men and women, all sources
300mgelemental from the supplement on a narrow diet
150mgelemental per capsule on the worked example
400mgthe supplement-only ceiling

The serving in elemental terms: Futuro Labs Magnesium Glycinate on Amazon UK, 150mg elemental per capsule, 300mg per 2, £19.99 for 180. Label breakdown. What elemental means is on the elemental magnesium page.

Why every dose on this site is stated in elemental terms

Elemental magnesium is the count of actual mineral in a serving, apart from the glycine, citrate or oxygen carrying it, and it is the only unit the UK framework speaks: the COMA reference intakes, 300mg a day for men and 270mg for women, are elemental; the 375mg labelling reference value behind every %NRV is elemental; the Expert Group on Vitamins and Minerals' 400mg supplement guidance level is elemental. Compound weights answer none of those questions. So how much elemental magnesium per day is really the whole dose question asked correctly, and the answer has two halves: what the body needs from everything, and what the supplement should add.

The body's need, the supplement's share, and the ceiling

The body needs 270mg to 300mg elemental a day from all sources, which a diet with greens, nuts, seeds, beans and wholegrains most days can supply unaided. The supplement's job begins where the diet or the training says otherwise: a narrow physique diet, raised sweat losses, the tiredness-cramps-twitching cluster. Then the number is 300mg elemental from the supplement, on top of food: it guarantees the reference intake on the worst day, lands beside the 350mg the athlete trials used once food is added, and leaves 100mg under the 400mg supplement ceiling, which food never counts toward. One capsule, 150mg, is the honest top-up for a near-complete diet. Above 400mg from supplements lies the laxative effect and nothing the trials require.

Elemental magnesium per capsule and per day, across product types
Product pattern	Elemental per capsule	Capsules for 300mg elemental	Reading
Glycinate, 20% buffered material (Futuro Labs Magnesium Glycinate)	150mg	2	The full serving in two: 300mg, 80% NRV
Glycinate, 14% fully reacted	About 100mg	3	Honest, bulkier
Compound-labelled glycinate 500mg capsule	About 70mg to 100mg	3 to 4	The costume; the front number is compound
Citrate 500mg capsule	About 80mg	4, with a bowel effect	Part-doses in the morning instead
Oxide 375mg tablet	375mg printed, about 15mg absorbed	1 on paper	Arithmetic honest, delivery not
Gummies	25mg to 50mg each	6 to 12	Confectionery with a mineral garnish

How much elemental magnesium should be in magnesium glycinate, and the routine

The variant asking what a glycinate should contain gets a clean answer: 300mg elemental per serving at 80% NRV, printed on the panel with the material's percentage in the ingredients so the maths checks, and anything printing far less per serving is either a top-up product or a compound-weight costume. Per capsule, the practical design is 150mg from 20% buffered material, two to a serving; three from 14% chelate is equally honest. The worked example is Futuro Labs Magnesium Glycinate: 1500mg bisglycinate at 20% per 2 capsules, elemental magnesium 300mg, 80% NRV, 150mg per capsule, vegan, UK made under GMP and BRC, panels shown, £19.99 for 180 capsules, 22p a day, taken with the evening meal daily. How much elemental magnesium per day: 300mg from the capsules when the plates fall short, 270mg to 300mg from everything either way, and never more than 400mg from the bottle.

What to check on the label

The body needs 270mg to 300mg elemental a day from all sources.
The supplement adds 300mg on a narrow diet, 150mg as a top-up.
400mg from supplements is the ceiling; food never counts toward it.
Per capsule: 150mg on 20% material, about 100mg on 14%; compound labels mislead.
A glycinate serving should print 300mg at 80% NRV with the percentage beside the form.

The worked example: Futuro Labs Magnesium Glycinate

Futuro Labs Magnesium Glycinate states the elemental maths per capsule and per serving: 150mg each, 300mg per 2 (80% NRV), from 1500mg bisglycinate at 20%, 22p a day from a £19.99 bottle of 180. Vegan, UK made, panels shown.

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

See it on Amazon UK Full label breakdown

Futuro Labs Magnesium Glycinate, 180 capsule bottle

Questions people also ask

How much elemental magnesium should you take per day?

300mg from a supplement on a narrow diet, 150mg as a top-up on a good one, under the 400mg supplement ceiling. The body's total need is 270mg to 300mg from all sources.

How much elemental magnesium is in magnesium glycinate?

14% to 20% of the compound weight: 1500mg of 20% material carries 300mg; 300mg of 14% chelate carries only about 42mg.

How much elemental magnesium per capsule is normal?

150mg on dense 20% material, about 100mg on fully reacted chelate. Single capsules claiming far more are usually oxide behind a glycinate name.

How much elemental magnesium does the body need?

300mg a day for men and 270mg for women from food, water and supplements combined, per the UK reference intakes.

How much elemental magnesium glycinate should I take for sleep or training?

The same 300mg elemental daily with the evening meal; the trials behind both used doses that 300mg supplemental plus food reaches.

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).
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
Firoz M, Graber M. Bioavailability of US commercial magnesium preparations. Magnesium Research 2001;14(4):257-262. PubMed record
Setaro L, et al. Magnesium status and the physical performance of volleyball players: effects of magnesium supplementation. Journal of Sports Sciences 2014;32(5):438-445. PubMed record
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