Research
Micronutrients & recovery
High doses of magnesium impair fractional absorption efficiency, whereas low doses are absorbed more efficiently, although absolute absorption increases with dose.
Avoid taking massive single doses of magnesium (e.g., >500mg at once) if your goal is efficient absorption. While you will absorb more total milligrams, the percentage absorbed drops drastically. To maximize efficiency, keep individual doses moderate (e.g., <100-200mg) and spread them out.
GoodQualifiesHIGH confidence
It is generally thought that the relative absorption of Mg2+ is inversely related to the ingested dose... relative Mg2+ absorption rate from a daily dose of 36 mg was 65%, whereas, only 11% was absorbed from a daily dose of 973 mg
Why this rating
Consistent findings across human balance studies and isotopic tracer studies.
Source
Intestinal Absorption and Factors Influencing Bioavailability of Magnesium- An Update
Jan Philipp Schuchardt et al. · Current Nutrition & Food Science · 2017
DOI 10.2174/1573401313666170427162740
narrative_reviewCited 208×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- 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.Good
- Dietary components such as proteins, medium-chain triglycerides, and indigestible carbohydrates (prebiotics) enhance magnesium absorption, while phytates, oxalates, and high fiber impair it.Moderate
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