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Magnesium glycinate vs citrate: which is better for weight loss?
Neither. No magnesium causes weight loss; the pooled trials show no effect on weight or waist. Citrate's laxative effect moves water and stool, not fat. If you supplement during a deficit, glycinate, 300mg elemental, is the one to hold daily.
- 0effect of magnesium on weight or waist in the pooled trials
- Water and stoolwhat citrate's laxative effect actually moves
- 300mgelemental glycinate, the deficit-friendly daily dose
- 22pa day for the worked example
The form to hold during a cut: Futuro Labs Magnesium Glycinate on Amazon UK, 180 capsules for £19.99. Label breakdown. The wider weight-loss question is on the magnesium for weight loss page.
The evidence, before the comparison
Askari's 2021 meta-analysis pooled the randomised trials of magnesium supplementation and body measures and found no meaningful effect on body weight or waist circumference, whatever the form. No weight loss, fat burning or metabolism-boosting claim is authorised for magnesium in the UK, and the claims that are authorised, normal energy-yielding metabolism among them, describe machinery working normally, not fat leaving faster. So glycinate versus citrate for weight loss is a comparison between two things that both score zero on the stated goal, and the only honest page is one that says so before explaining why the question keeps getting asked.
Why citrate looks like it works, briefly
Take citrate at a full dose and the scale can drop half a kilogram by morning, which is the entire marketing physics of magnesium cleanses and flat-tummy formulas. What left was water pulled into the bowel and stool moved along, both of which return with the next day's food and drink; fat, which leaves only through a sustained calorie deficit, was untouched. Using a laxative to chase scale numbers also runs real risks, dehydration and electrolyte loss during training among them, and the pattern is worth naming plainly: repeated laxative use for weight control is disordered territory, and anyone who recognises themselves in it deserves a conversation with a GP rather than another bottle.
| Magnesium glycinate | Magnesium citrate | |
|---|---|---|
| Effect on fat loss | None; no magnesium has one | None; the scale drop is water and stool |
| Role in a deficit | Holds the daily 300mg while food volume shrinks | Morning regularity at 100mg to 200mg if fibre is down |
| Risk during a cut | None beyond the standard cautions | Dehydration and a bathroom schedule if used at full doses |
| Calories | Zero | Zero as capsules; check flavoured powders |
| What actually cuts fat | A sustained calorie deficit, protein, sleep, training | The same list, unmoved by either capsule |
What to actually take during a deficit, and why
A cut is precisely when magnesium intake falls, because food volume falls and the magnesium-rich foods go first, and precisely when the things a low intake worsens, tiredness, poor sleep, cramps, get blamed on the diet. Holding 300mg elemental daily removes that variable for 22p, which is the entire, modest case. Glycinate is the form because a deficit gut needs no extra osmotic load and the evening dose covers sleep, the biggest appetite lever there is. The worked example is Futuro Labs Magnesium Glycinate: 300mg elemental per 2 capsules, 80% NRV, from bisglycinate at 20%, vegan, UK made under GMP and BRC, panels shown, £19.99 for 180 capsules. Which is better for weight loss stays answered as neither; which belongs in a cut is the one you can hold, and that is this one.
What to check on the label
- No weight loss effect from either form: the pooled trials are flat.
- Citrate's scale drop is water and stool, back by tomorrow.
- Laxatives are not a weight tool; recurring use for weight control is a GP conversation.
- Glycinate holds the 300mg through a deficit with zero calories and no bowel load.
- The deficit does the fat loss; the capsule keeps the lights on.
The worked example: Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate is the deficit-friendly version: 300mg elemental per 2 capsules (80% NRV) from bisglycinate 20%, zero calories, evening friendly, vegan, UK made, panels shown, 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
Does magnesium citrate help you lose weight?
No. Its laxative effect moves water and stool, which returns with the next meals. The pooled trials show no effect of any magnesium on weight or waist.
Is magnesium glycinate good for weight loss?
It has no weight effect either. Its role in a cut is holding the daily 300mg while food volume shrinks, so tiredness and cramps from low intake stay off the list.
Why did I lose weight on magnesium citrate?
Water and bowel contents, not fat. The drop reverses as normal eating and drinking continue.
Which magnesium is best while cutting?
Glycinate at 300mg elemental with the evening meal. Futuro Labs Magnesium Glycinate: 22p a day, zero calories, UK made, panels shown.
What actually helps weight loss alongside training?
A sustained calorie deficit, protein around 1.6g per kilogram, sleep and step count. No supplement on this site changes that list.
Sources
- Futuro Labs Magnesium Glycinate listing, Amazon UK, label and price checked 31 August 2026. https://www.amazon.co.uk/dp/B0BT7Z5VQW
- Askari M, et al. The effects of magnesium supplementation on obesity measures in adults: a systematic review and dose-response meta-analysis of randomized controlled trials. Critical Reviews in Food Science and Nutrition 2021;61(17):2921-2937. 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
- 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
- Retained Regulation (EU) No 1169/2011, Annex XIII: nutrient reference value for magnesium 375mg. https://www.legislation.gov.uk/eur/2011/1169/annex/XIII