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What is the best magnesium glycinate 300 mg in the UK?
The best magnesium glycinate 300mg in the UK is one where the 300mg is elemental magnesium, not 300mg of compound, about 42mg of magnesium. Futuro Labs Magnesium Glycinate gives 300mg elemental per 2 capsules, 80% NRV, 22p a day.
- 300mgelemental magnesium per 2 capsules
- 42mgmagnesium in 300mg of full bisglycinate, the other reading
- 80%NRV, the figure that proves which one you have
- 22pa day, 180 capsules for £19.99
Worked example: Futuro Labs Magnesium Glycinate on Amazon UK, 180 capsules for £19.99. Full label on the product page.
Why 300mg on a glycinate label can mean two very different things
Magnesium bisglycinate is magnesium bound to two glycine molecules, and a full chelate is about 14% magnesium by weight. So a capsule that says magnesium glycinate 300mg can be 300mg of the compound, which is about 42mg of magnesium and 11% of the NRV, or 300mg of elemental magnesium, which is roughly 1500mg to 2100mg of compound and a full 80% of the NRV. Brands know which reading sells and the front of the pack is where the ambiguity lives. The %NRV figure on the nutrition panel is the tell: 300mg of elemental magnesium shows as 80%; a 300mg compound dose shows as about 11%, or does not print the percentage at all.
| Label wording | What it actually gives | %NRV you should see | Verdict |
|---|---|---|---|
| Elemental magnesium 300mg (from 1500mg magnesium bisglycinate 20%) | 300mg magnesium per serving | 80% | The real thing; the worked example's panel |
| Magnesium (as bisglycinate) 300mg | Usually 300mg elemental, but check the NRV | 80% | Good if the 80% is printed |
| Magnesium bisglycinate 300mg | About 42mg magnesium if a full chelate | About 11%, often not printed | A token dose sold on the number |
| Magnesium glycinate 300mg, 3 capsules | Ambiguous; 100mg of compound per capsule is 14mg magnesium each | Check | Assume the worst unless the panel says otherwise |
| Buffered bisglycinate 300mg | A blend with oxide to raise the percentage; magnesium content depends on the buffer | Check | Fine if elemental is printed; the word buffered means read carefully |
What the best 300mg glycinate looks like on the panel
Serving size printed in capsules. A line for elemental magnesium at 300mg with 80% NRV beside it. An ingredients line that starts with magnesium bisglycinate and states the percentage, because a 20% figure tells you it is a buffered chelate and that 1500mg of it gives 300mg of magnesium. A third-party test panel for heavy metals and microbiology shown on the listing. A UK manufacturer address. And a price that divides to under 25p a day. Futuro Labs Magnesium Glycinate prints all of it: elemental magnesium 300mg, 80% NRV, magnesium bisglycinate 20%, 2 capsules a day, 180 capsules for £19.99, 22p a day, vegan capsules, made in the UK under GMP and BRC, tested for lead, mercury, arsenic and cadmium.
Why 300mg elemental is the right amount for a lifter
The UK reference nutrient intake is 300mg a day for men and 270mg for women, so one serving covers the whole figure on top of whatever food provides, and it sits under the 400mg a day guidance level for supplements that the Expert Group on Vitamins and Minerals set to avoid the laxative effect. It is also the dose region the athlete trials used: 350mg a day in Setaro's volleyball study and Reno's soreness study. A glycinate delivers that without the bowel effect of citrate, which is why 300mg elemental glycinate, 2 capsules, is the format this whole section is built around. It is the 300mg elemental one.
What to check on the label
- Elemental magnesium 300mg as its own line, with 80% NRV beside it.
- The percentage after bisglycinate in the ingredients (20% means 1500mg gives 300mg).
- Capsules per serving, so 300mg is a serving and not three capsules of compound.
- A shown test panel and a UK address.
- Cost per day under 25p for the real 300mg.
The worked example: Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate is the worked example because it is the unambiguous version of a magnesium glycinate 300mg: elemental magnesium 300mg per 2 capsules, 80% NRV, from 1500mg bisglycinate at 20%, vegan, UK made, third-party tested, 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
Is magnesium glycinate 300mg the same as 300mg of magnesium?
Only if the label says elemental magnesium 300mg or shows 80% NRV. 300mg of the compound is about 42mg of magnesium.
How many capsules of magnesium glycinate for 300mg?
Depends on the product. Futuro Labs Magnesium Glycinate gives 300mg elemental in 2 capsules; compound-labelled products can need six or more.
Is 300mg of magnesium glycinate too much?
300mg elemental is the UK reference intake for men and under the 400mg guidance level for supplements. It is a full daily dose, not an excessive one.
What is the best magnesium glycinate 300mg for sleep?
The same product, taken with the evening meal. The dose is the dose; timing is the only change.
Which UK brand sells a real 300mg elemental glycinate?
Futuro Labs Magnesium Glycinate: 300mg elemental per 2 capsules, 80% NRV printed, 22p a day, UK made, third-party tested.
Sources
- Futuro Labs Magnesium Glycinate listing, Amazon UK, label and price checked 31 August 2026. https://www.amazon.co.uk/dp/B0BT7Z5VQW
- Retained Regulation (EU) No 1169/2011, Annex XIII: nutrient reference value for magnesium 375mg. https://www.legislation.gov.uk/eur/2011/1169/annex/XIII
- 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).
- 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
- 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
- Reno AM, Green M, Killen LG, O'Neal EK, Pritchett K, Hanson Z. Effects of magnesium supplementation on muscle soreness and performance. Journal of Strength and Conditioning Research 2022;36(8):2198-2203. 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