What is the most absorbable form of magnesium?

Magnesium glycinate is the most consistently absorbable form in controlled studies, with bioavailability in the 50–80% range. It is chelated to the amino acid glycine, which acts as a transport carrier across the intestinal wall. Magnesium malate and citrate are also well-absorbed alternatives.

Is magnesium oxide worth taking?

Magnesium oxide has approximately 4% bioavailability in controlled absorption studies, meaning most of the dose is excreted without reaching the bloodstream. It is widely used in low-cost supplements because it contains a high percentage of elemental magnesium by weight, making label numbers look favorable. For therapeutic purposes, chelated forms such as glycinate or malate are significantly more effective.

Can I take magnesium glycinate and magnesium threonate together?

Yes. Glycinate and threonate serve different primary purposes — glycinate supports systemic magnesium repletion, while threonate is specifically designed to raise magnesium levels in the brain. Many practitioners use both forms concurrently without concern for interaction. Total daily intake across all forms should remain within established tolerable upper intake levels.

Moderate Evidence

Best Form of Magnesium: A Clinical Guide

Magnesium is involved in over 300 enzymatic reactions. Yet the form matters enormously: absorption may range from 4% (oxide) to over 80% (glycinate) depending on which salt you take. This guide ranks every commercially relevant form by verified bioavailability data so you can make an informed choice.

Updated 2026 · Reviewed by Dr. Brennan Commerford, D.C.

All Forms Ranked by Evidence

Several forms share the top tier: their absorption profiles are statistically comparable in the published research, so they collapse into one band rather than splitting hairs over differences too small to matter clinically. Within the tier, the most-cited form is listed first.

1
95/ 100· Top TierBest by EvidenceFF Preferred
Magnesium (as Albion® Magnesium Bisglycinate Chelate Buffered)
Form: Albion® Magnesium Bisglycinate Chelate Buffered
2
95/ 100· Top TierFF Preferred
Magnesium (as Magnesium Citrate)
Form: Magnesium Citrate
3
20/ 100· Entry Level
Magnesium (Oxide)
Form: Oxide
—
Verification pendingFF Preferred
Magnesium (as DiMagnesium Malate)
Form: DiMagnesium Malate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pendingFF Preferred
Magnesium (as Magnesium L-Threonate)
Form: Magnesium L-Threonate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pendingFF Preferred
Magnesium (as Magnesium Taurinate)
Form: Magnesium Taurinate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium (Buffered)
Form: Buffered
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium (Gluconate)
Form: Gluconate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium (Hydroxide)
Form: Hydroxide
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium (Lactate)
Form: Lactate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium (Orotate)
Form: Orotate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium (Sulfate)
Form: Sulfate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Ascorbate
Form: Ascorbate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Aspartate
Form: Aspartate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Asporotate
Form: Asporotate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium BHB (elemental potency)
Form: elemental potency
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Bisglycinate (generic)
Form: Bisglycinate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Bisglycinate Chelate (TRAACS®)
Form: TRAACS®
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Caprylate Dihydrate
Form: Caprylate Dihydrate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Carbonate
Form: Carbonate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Chloride
Form: Chloride
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Glycerate
Form: Glycerate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Glycerophosphate
Form: Glycerophosphate
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
Magnesium Malate (1:1 ratio)
Form: Malate (1:1)
Evidence for this form is under review — no score is shown until it is verified.

Editorial note

Glycinate delivers 50–80% absorption, the highest of any common magnesium salt, and is chelated to glycine — an amino acid that aids intestinal transport without the laxative effect seen with citrate or oxide.

All Forms Compared

Magnesium Glycinate

Best For

Sleep, anxiety support, general repletion

Chelated form — glycine acts as a transport carrier across the intestinal wall.

Magnesium Malate

Best For

Energy support, muscle recovery, fatigue

Malate is a citric-acid-cycle intermediate that may support mitochondrial energy production.

Magnesium Citrate

Best For

General use, constipation relief

Osmotic effect can cause loose stools at higher doses — useful when bowel regularity is a goal.

Magnesium Threonate

Best For

Cognitive support, memory

Uniquely crosses the blood-brain barrier; systemic repletion requires very large doses.

Magnesium Oxide

Best For

N/A — cheap filler in low-quality supplements

Bioavailability is approximately 4% in controlled studies. Present mainly for its high elemental magnesium content on labels, not for absorption.

Frequently Asked Questions

What is the most absorbable form of magnesium?: Magnesium glycinate is the most consistently absorbable form in controlled studies, with bioavailability in the 50–80% range. It is chelated to the amino acid glycine, which acts as a transport carrier across the intestinal wall. Magnesium malate and citrate are also well-absorbed alternatives.
Is magnesium oxide worth taking?: Magnesium oxide has approximately 4% bioavailability in controlled absorption studies, meaning most of the dose is excreted without reaching the bloodstream. It is widely used in low-cost supplements because it contains a high percentage of elemental magnesium by weight, making label numbers look favorable. For therapeutic purposes, chelated forms such as glycinate or malate are significantly more effective.
Can I take magnesium glycinate and magnesium threonate together?: Yes. Glycinate and threonate serve different primary purposes — glycinate supports systemic magnesium repletion, while threonate is specifically designed to raise magnesium levels in the brain. Many practitioners use both forms concurrently without concern for interaction. Total daily intake across all forms should remain within established tolerable upper intake levels.

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FormulaForge formulates and sells supplements containing the ingredients discussed on this page. Our formulary recommendations are based on peer-reviewed bioavailability research. All cited studies are independently verifiable.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.