A critical distinction emerges from bioavailability research: magnesium citrate demonstrates 55% dissolution in water compared to magnesium oxide’s 43%, a difference with direct clinical implications.
This solubility advantage translates to superior absorption rates. A 60-day randomized controlled trial by Walker et al. (2003) involving 46 healthy adults confirmed that citrate and amino acid chelate forms significantly outperformed oxide, with citrate producing the highest serum magnesium levels at both acute and 60-day timepoints (p=0.033).
However, the mechanistic picture clarifies an important misconception: all magnesium salts dissociate identically in stomach acid, releasing the same magnesium ion. The performance difference reflects solubility characteristics, not organ-targeting properties. Clinicians should prioritize formulation solubility when recommending supplements, not marketing claims about specific tissues.
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