Bio Magnesium
Blackmores · 301mg (oxide + phosphate) · 90 tabs
4.33rd party testedstrong evidence
5.6of 10
where to buy · 2 sellersfrom S$30S$0.33 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 5.6 of 10: Widely stocked local pharmacy pick, but largely magnesium oxide, which absorbs poorly.
what’s good
- Easy to find in Watsons and Guardian
- Adds vitamin D, B6 and C
- Trusted mainstream brand
worth knowing
- Primarily magnesium oxide, low absorption
- High label milligrams overstate what you absorb
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
4.3· aggregated across retailer sites
Pharmacy shoppers give it solid stars for cramps and availability, it is everywhere in Watsons. The informed minority is blunter: it is mostly oxide, absorbs poorly, and better forms cost the same online. Reviews rarely mention sleep benefits.
easy to find in SGcramp reliefoxide caveat
AI summary of public retailer reviews
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