What is a good amount of magnesium glycinate per day?

Defining good, so the number stops being folklore

Good is doing four jobs at once, and naming them turns a vibes question into an audit. Test one, coverage: a good amount guarantees the UK reference intake, 300mg for men and 270mg for women, on the worst dietary day of the week, since the supplement exists for exactly those days. Test two, ceiling: it leaves genuine headroom under the Expert Group on Vitamins and Minerals' 400mg supplement guidance level, so an antacid or fortified shake cannot tip the day over. Test three, evidence: combined with ordinary food it lands where the positive trials dosed, the 350mg athlete studies and the 320mg-to-500mg sleep work. Test four, sustainability: it maps onto a capsule count a human maintains nightly for months, because the perfect dose taken sporadically loses to the good dose taken always.

The candidates, run through the rubric

Run the shelf's common amounts through all four tests and the field thins fast. Token doses, 50mg to 100mg, fail coverage outright, gummies and compound-labelled costumes living here. 150mg passes a modified coverage test, topping up a diet that nearly gets there, and passes everything else, which is why it is the honest answer for the near-complete eater, one capsule. 300mg passes all four cleanly: coverage with margin, 100mg of ceiling headroom, trial territory once dinner joins, and exactly two capsules forever. 375mg passes coverage and evidence while scraping the ceiling test, 25mg of headroom being a labelling aesthetic rather than a margin. 400mg sits on the line and fails headroom by definition. And 500mg-plus fails two tests at once, over the ceiling with no trial reward, the supervised-study numbers masquerading as daily advice.

The answer, sized to the person, and the product that embodies it

What is a good amount of magnesium glycinate per day: 300mg elemental for the narrow-diet lifter this site writes for, 150mg for the eater whose plates nearly cover it, both taken with the evening meal, both judged after four to eight weeks against the low-intake cluster, and neither ever needing to climb, because good amounts are thresholds, not trajectories. The embodiment: Futuro Labs Magnesium Glycinate, 150mg elemental per capsule so both good amounts are whole-capsule answers, 300mg at 80% NRV from 1500mg of bisglycinate at 20% as the standard 2-capsule serving, vegan, UK made under GMP and BRC, panels shown, £19.99 for 180 capsules, 22p a day at the full amount. Four tests, one number, two capsules: good, defined and delivered.

What to check on the label

Questions people also ask

Is 200mg of magnesium glycinate a day enough?

It sits between the honest tiers: above a top-up, below full coverage. Round to 150mg on a good diet or 300mg on a narrow one and the logic stays clean.

Is 300mg of magnesium glycinate a day a good amount?

Yes, by all four tests: reference intake covered, 100mg under the ceiling, trial territory reached with food, and exactly two capsules forever.

Can a good amount change over time?

Only with your diet: plates that improve downshift you to 150mg or to nothing. The number responds to food, never to time served.

Why not take a bit more to be safe?

Safety runs the other way: adequacy is a threshold, so extra milligrams buy no benefit while eating the ceiling headroom that keeps ordinary days safe.

What amount of glycinate for sleep or recovery specifically?

The same 300mg: both use-cases run on corrected intake, and the trials behind each are reached once food joins the serving.

Sources

1. Futuro Labs Magnesium Glycinate listing, Amazon UK, label and price checked 31 August 2026. https://www.amazon.co.uk/dp/B0BT7Z5VQW
2. 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).
3. 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
4. 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
5. 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
6. Retained Regulation (EU) No 1169/2011, Annex XIII: nutrient reference value for magnesium 375mg. https://www.legislation.gov.uk/eur/2011/1169/annex/XIII
7. 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

Related answers

• What does magnesium glycinate cost per day in the UK?
• Is it safe to take 400mg of magnesium glycinate per day?
• How much magnesium per day for a woman?
• How much elemental magnesium per day?
• How much magnesium per day for a woman over 50?
• Is it safe to take 400 mg of magnesium per day?