Micronutrients & recovery
Distributing magnesium intake across multiple small doses throughout the day significantly increases fractional absorption and retention compared to consuming the same total amount in a single bolus.
If you take magnesium supplements, do not take the entire daily dose at once. Split the total amount into 2-4 smaller doses taken throughout the day with meals. This strategy maximizes absorption because the body's active transport mechanisms (TRPM6/7) are more efficient at lower concentrations, whereas high single doses saturate these pathways and lead to lower relative absorption.
In principle, the relative Mg2+ uptake is higher when the mineral is ingested in multiple low doses throughout the day compared to a single, large intake of Mg2+.
Why this rating
Supported by multiple human studies using stable isotopes (Sabatier, Nakamura) and animal models, though the paper notes methodological variability in the broader field.
Source
Intestinal Absorption and Factors Influencing Bioavailability of Magnesium- An Update
Jan Philipp Schuchardt et al. · Current Nutrition & Food Science · 2017
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