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How many days does a 180 capsule bottle of magnesium glycinate last?
A 180-capsule bottle of magnesium glycinate lasts 90 days at the standard 2-capsule, 300mg serving, or 180 days at the 1-capsule top-up. At £19.99 that is 22p or 11p a day, and one reorder covers a whole season.
- 90 daysat the standard 2-capsule serving: a quarter of a year
- 180 daysat the 1-capsule, 150mg top-up
- 22pa day at full serving; 11p at the top-up
- 4 bottlesa whole year of the habit, about £80
The bottle this page counts: Futuro Labs Magnesium Glycinate on Amazon UK, 180 capsules, £19.99, 90 standard servings. Label breakdown. The serving mechanics are on capsules per serving; the cost comparison on magnesium cost per day.
The arithmetic, and why 90 days is a convenient number
The division is instant, 180 capsules over 2 per day is 90 days, but the number's convenience deserves noticing. Ninety days outlasts the eight-week window this site sets for every honest self-test, tiredness, cramps, twitching and sleep judged against a baseline, with a fortnight to spare, so a single bottle carries a complete verdict on whether the habit earns its reorder. It maps onto a season: one bottle per quarter, four per year, a rhythm simple enough to run on a calendar reminder or a 90-day subscription without ever counting capsules. And it makes the annual cost legible in one multiplication, four bottles at £19.99 being roughly £80 a year, the figure worth holding when comparing this habit against any other line in a supplement budget. The 1-capsule top-up user, 150mg for a near-complete diet, doubles everything: 180 days, half a year, 11p.
The comparison trap, and the audit that beats it
Bottle sizes are where supplement pricing hides, because the shelf shows capsule counts while your wallet experiences days, and the two diverge the moment serving sizes differ. A 120-capsule bottle at a 3-capsule serving is 40 days; a 90-capsule bottle at 2 is 45; a 60-capsule bottle at 2 is a single month that will need buying twelve times a year, postage and lapses included; and a 180-count bottle of a 4-capsule-serving product is 45 days wearing a 90-day costume. The audit is always the same two divisions run in order: capsules per bottle over capsules per serving gives true days, then price over true days gives cost per day, the only number on which any two magnesium products can be honestly compared, and the one this site prints for its worked example on every page.
| Bottle | Serving | True days | At a typical price, per day |
|---|---|---|---|
| 60 capsules | 2 per day | 30 days | A monthly repurchase habit: the expensive rhythm |
| 90 capsules | 2 per day | 45 days | Eight reorders a year |
| 120 capsules | 3 per day | 40 days | The count that looks bigger than it lasts |
| 180 capsules, 4-capsule serving | 4 per day | 45 days | The 90-day costume |
| 180 capsules, 2-capsule serving | 2 per day | 90 days: a full quarter | 22p at £19.99: the worked example |
| 180 capsules, 1-capsule top-up | 1 per day | 180 days | 11p: the near-complete-diet rate |
The rhythm in practice, and the bottle that keeps it simple
How many days does a 180-capsule bottle of magnesium glycinate last: 90 at the full serving, a quarter-year per purchase, which sets the whole ownership rhythm, order in the first week of January, April, July and October, or set a 90-day repeat and forget the question entirely, with the eight-week honesty check falling naturally inside each bottle's life. The bottle built to that rhythm: Futuro Labs Magnesium Glycinate, 180 capsules at 150mg elemental each, 2 capsules with the evening meal for 300mg at 80% NRV, exactly 90 servings with no orphan capsules at the end, vegan, UK made under GMP and BRC, panels shown, £19.99, 22p a day, roughly £80 a year. A supplement that costs less per day than the coffee it sits beside, and asks for your attention four times a year.
What to check on the label
- 180 capsules ÷ 2 per day = 90 days: one bottle per quarter, four per year.
- The 1-capsule top-up doubles it: 180 days at 11p.
- 90 days contains the full 8-week self-test with margin: one bottle, one verdict.
- Compare bottles by true days, never capsule counts: two divisions settle it.
- Annual cost: about £80: the legible number for the supplement budget.
The worked example: Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate is the quarter-year bottle: 180 capsules, 2 with dinner for 300mg elemental (80% NRV), exactly 90 servings, £19.99 at 22p a day, four bottles a year. 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
Questions people also ask
How long does 180 capsules last at one a day?
180 days, half a year: the 150mg top-up rate for near-complete diets, at about 11p a day.
Is a 180-capsule bottle better value than a 60-capsule one?
Almost always per day, and doubly so in practice: fewer reorders means fewer lapses, and lapses are what break the mechanism.
When should I reorder my magnesium?
On a 90-day rhythm, or when the bottle drops to a fortnight's worth: enough buffer that a late delivery never interrupts the habit.
Do capsules expire before a big bottle runs out?
No: best-before dates on capsules run years, and a 90-day bottle is consumed long inside any of them.
How much does a year of magnesium glycinate cost?
About £80 at the standard serving: four £19.99 bottles, 22p a day, the number to weigh against any other supplement line.
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
- 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