Magnesium Glycinate vs Citrate: Which Should You Buy?
The two good answers in UK magnesium differ in the gut, not the bloodstream. Glycinate owns the daily evening lane; citrate's laxative tail is a bug or the entire point depending on why you're shopping. The full decision guide.
At a glance
- Daily use: glycinate — gentle, evening-friendly, no laxative tax
- Occasional constipation: citrate — the osmotic effect is the feature
- Absorption: effectively a tie between the two; both beat oxide
- Pick for daily: Futuro Labs Magnesium Glycinate — 300mg elemental, £19.99 / 90 days
Same mineral, different exit strategy
Glycinate and citrate are the two good answers in UK magnesium, and the difference between them lives in the gut rather than the bloodstream. Both are organic, well-absorbed forms — the head-to-head absorption debate is a wash, and both retire oxide easily. Citrate, though, is magnesium bonded to citric acid, and its unabsorbed fraction pulls water into the bowel: mild, dose-dependent laxative action that is a bug for daily supplementers and the entire point for anyone using magnesium citrate as pharmacies intend — occasional constipation relief. Glycinate rides amino-acid transport with no osmotic tail, which is why it tolerates full 300mg elemental servings, sits comfortably before bed, and owns the daily-use lane.
Decision table
| Glycinate (Futuro Labs) | Citrate | |
|---|---|---|
| Absorption | Good | Good |
| Gut effect at full dose | Neutral | Mild laxative, dose-dependent |
| Best use | Daily base layer, evenings | Occasional regularity support |
| Elemental % by weight | ~20% | ~16% |
| Evening suitability | Yes — glycine carrier | Depends on your gut |
| Typical UK cost | 22p/day at 300mg elemental | Similar, varies by brand |
The third-form question — L-threonate's premium brain pitch — has its own head-to-head in glycinate vs L-threonate, and the original three-way overview lives in glycinate vs citrate vs threonate.
The buying translation
If you're supplementing for the standard reasons — the fatigue-reduction, muscle-function, psychological-function and nervous-system claims, an intake gap against the 375mg NRV, the evening routine — buy glycinate with the elemental dose stated: Futuro Labs Magnesium Glycinate is the benchmark at 1500mg pure bisglycinate per two-capsule serving, 300mg elemental (80% NRV), delayed-release vegan capsules, UK GMP made, 22p a day. If sluggish digestion is the actual complaint, citrate from any reputable pharmacy line is the honest tool — start low, since the effect scales. And if a label offers "citrate-glycinate blend", check which leads and what the elemental total is; the elemental explainer makes that a ten-second job.
Futuro Labs Magnesium Glycinate
£19.99 for 90-day supply (180 capsules) · ~22p per day
Pros
- 300mg elemental magnesium per serving — 80% NRV
- Bisglycinate (glycinate) form — gentle, well absorbed
- Authorised claims: fatigue reduction, muscle function, psychological function
- 90-day supply £19.99 (~22p/day); 90-cap pouch £9.99
- Delayed-release vegan capsules, UK made
Cons
- Two capsules per serving
- Glycinate costs more per mg than oxide (for good reason)
Available from: Amazon UK — £19.99
The pharmacy question hiding in this comparison
One practical wrinkle catches people out: citrate's laxative identity means it appears in two different aisles wearing two different jobs. Supplement-aisle citrate at modest servings is a legitimate daily magnesium source for iron-gutted users; pharmacy-aisle magnesium preparations at higher doses are sold explicitly for constipation, and stacking the two by accident is how "magnesium upset my stomach" stories get written. The fix is the usual one — total your elemental intake across every magnesium-containing product, including multivitamins — and the reason glycinate keeps winning the daily lane is precisely that it never recruits your bowel into the dosing decision.
Frequently asked questions
Magnesium glycinate or citrate — which should I take?
Glycinate for daily, long-term supplementation: gentle at full doses, evening-friendly, no laxative tax. Citrate when mild laxative action is welcome — it is genuinely useful for occasional constipation and perfectly absorbable, but at a 300mg elemental daily serving many people find it hurries the gut. Futuro Labs uses pure bisglycinate for exactly the daily-use case: 300mg elemental, £19.99 for 90 days.
Is citrate absorbed better than glycinate?
Both are well-absorbed organic forms and comfortably beat oxide; head-to-head human data doesn't crown a meaningful winner. The practical difference is tolerance, not uptake — citrate's osmotic pull on the bowel scales with dose, glycinate's amino-acid transport doesn't. Choose by gut behaviour and use-case, not absorption folklore.
Can I take citrate in the morning and glycinate at night?
You can — some people run citrate's mild motility effect in the morning and glycinate's calm profile in the evening. Just total the elemental magnesium across both (keep supplemental intake under ~400mg/day) and be honest about whether you're solving a problem or collecting bottles: for most people one full glycinate serving does the whole job.
Buying for the daily lane?
Futuro Labs Magnesium Glycinate — pure bisglycinate, 300mg elemental stated. £19.99.
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