Magnesium
21st Century · 250mg · 110 tabs
4.0strong evidence
4.6of 10
where to buy · 1 sellerfrom S$12S$0.11 per tablet
Good for: regularity. Chasing focus instead? Magnesium L-threonate has the better evidence for that. See those instead
The score explained
evidence, testing and value, weighed before price
Why 4.6 of 10: The cheap pharmacy oxide. Fine for regularity, poor for anything else.
what’s good
- Very cheap
- Everywhere in local pharmacies
worth knowing
- Magnesium oxide, poorly absorbed
- Testing status not confirmed in our data
what the evidence says
Oxide is the cheapest and worst-absorbed common form; a meaningful fraction passes through unabsorbed, which is why it works reliably as a laxative and unreliably for everything else. Label milligrams flatter it. For sleep or stress goals, better-absorbed forms are the evidence-aligned choice.
Bioavailability of US commercial magnesium preparationsFiroz & Graber, Magnes Res · 2001Mg citrate found more bioavailable than other Mg preparations in a randomised, double-blind studyWalker et al., Magnes Res · 2003
browse all research on magnesiumreviews
4.0· aggregated across retailer sites
Reviews are short and practical: cheapest magnesium on the shelf, does the job for regularity. Almost nobody reports sleep or stress benefits, and a few mention stomach grumbles at full dose. You get what you pay for is the recurring line.
cheapest optionkeeps things regularfew sleep reports
AI summary of public retailer reviews
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