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Types of Magnesium: Forms & Bioavailability

Evidence:Strong
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Forms Comparison

FormBioavailabilityBest ForElemental Content
Magnesium GlycinateHighSleep, anxiety, general supplementation14% elemental magnesium by weight
Magnesium CitrateHighConstipation relief, general supplementation16% elemental magnesium by weight
Magnesium L-ThreonateModerateCognitive function, brain health8% elemental magnesium by weight
Magnesium OxideLow (4%)Budget option, high elemental content60% elemental magnesium by weight
Magnesium TaurateModerate-HighHeart health, blood pressure9% elemental magnesium by weight

Magnesium Glycinate

Bioavailability: High. Best for: Sleep, anxiety, general supplementation. Elemental content: 14% elemental magnesium by weight.

Magnesium Citrate

Bioavailability: High. Best for: Constipation relief, general supplementation. Elemental content: 16% elemental magnesium by weight.

Magnesium L-Threonate

Bioavailability: Moderate. Best for: Cognitive function, brain health. Elemental content: 8% elemental magnesium by weight.

Magnesium Oxide

Bioavailability: Low (4%). Best for: Budget option, high elemental content. Elemental content: 60% elemental magnesium by weight.

Magnesium Taurate

Bioavailability: Moderate-High. Best for: Heart health, blood pressure. Elemental content: 9% elemental magnesium by weight.

Find the best Magnesium for your needs
Ranked by form, bioavailability, and value
Full Magnesium Guide

References

  1. ReviewBoyle NB, Lawton C, Dye L (2017). The Effects of Magnesium Supplementation on Subjective Anxiety and Stress—A Systematic Review. Nutrients. DOI PubMed
  2. ReviewArab A, Rafie N, Amani R, Shirani F (2023). The Role of Magnesium in Sleep Health: a Systematic Review of Available Literature. Biological Trace Element Research. DOI PubMed
  3. Meta-analysisArgeros Z, Xu X, Bhandari B, Harris K, et al. (2025). Magnesium Supplementation and Blood Pressure: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.. Hypertension (Dallas, Tex. : 1979). DOI PubMed
  4. Meta-analysisChen F, Wang J, Cheng Y, Li R, et al. (2024). Magnesium and Cognitive Health in Adults: A Systematic Review and Meta-Analysis.. Advances in nutrition (Bethesda, Md.). DOI PubMed
  5. Meta-analysisCurran J, Ross-White A, Sibley S (2023). Magnesium prophylaxis of new-onset atrial fibrillation: A systematic review and meta-analysis.. PloS one. DOI PubMed
  6. Meta-analysisGroenendijk I, van Delft M, Versloot P, van Loon LJC, et al. (2022). Impact of magnesium on bone health in older adults: A systematic review and meta-analysis.. Bone. DOI PubMed