Every Type of Magnesium Compared: Which Form Is Best for Your Goal?
Updated 11 April 2026
There are over 10 different forms of magnesium, each with different absorption rates, side effects, and ideal uses. This page compares them all with a clear recommendation for each health goal.
Quick Reference Table
| Form | Bioavailability | Best use | GI tolerance | Price |
|---|---|---|---|---|
| Glycinate | 25-35% | Sleep, anxiety, stress, sensitive stomachs | Excellent | $$ |
| Citrate | 25-35% | Constipation, general repletion, budget option | Moderate | $ |
| Threonate (L-Threonate) | High | Cognitive function, memory, brain health | Good | $$$ |
| Taurate | 20-30% | Heart health, blood pressure, anxiety with heart concerns | Good | $$ |
| Malate | 20-30% | Energy, muscle pain, fibromyalgia | Good | $-$$ |
| Oxide | 4-5% | Budget laxative (not recommended for supplementation) | Poor | $ |
| Chloride | 20-30% | Topical use (oil/flakes), oral supplementation | Good | $-$$ |
| Sulfate (Epsom Salt) | Low (oral) | Bath soaks, muscle relaxation (topical) | Poor (oral) | $ |
| Orotate | Moderate | Cardiovascular health, athletic performance | Good | $$$ |
| L-Aspartate | Moderate | General supplementation | Moderate | $$ |
Detailed Profiles
Magnesium Glycinate
Best for sleep and anxietyMagnesium bonded to glycine, an amino acid with calming and neuroprotective properties. The dual-action mechanism (magnesium + glycine) makes it uniquely effective for sleep and anxiety. Gentlest on the stomach of all forms. Higher cost due to complex chelation manufacturing process.
Bioavailability
25-35%
GI tolerance
Excellent
Price tier
$$
Best for
Sleep
Magnesium Citrate
Best for constipation and valueMagnesium bonded to citric acid. Excellent water solubility and good absorption. The osmotic laxative effect makes it the go-to for constipation relief. Affordable and widely available. May cause loose stools at higher doses.
Bioavailability
25-35%
GI tolerance
Moderate
Price tier
$
Best for
Constipation
Magnesium Threonate (L-Threonate)
Best for brain healthThe only magnesium form demonstrated to cross the blood-brain barrier effectively. Developed at MIT and patented as Magtein. Studies show it increases brain magnesium levels and improves learning, memory, and cognitive function. Significantly more expensive than other forms but serves a unique purpose.
Bioavailability
High
GI tolerance
Good
Price tier
$$$
Best for
Cognitive function
Magnesium Taurate
Best for heart healthMagnesium bonded to taurine, an amino acid that supports cardiovascular function and has calming properties. Studied for blood pressure reduction and cardiac rhythm stability. A good alternative to glycinate if you have anxiety combined with heart health concerns.
Bioavailability
20-30%
GI tolerance
Good
Price tier
$$
Best for
Heart health
Magnesium Malate
Best for energy and muscle painMagnesium bonded to malic acid, which plays a key role in the Krebs cycle (cellular energy production). Some evidence suggests benefit for fibromyalgia and chronic fatigue. Well-tolerated and reasonably priced. A good all-purpose option if energy is a concern.
Bioavailability
20-30%
GI tolerance
Good
Price tier
$-$$
Best for
Energy
Magnesium Oxide
Not recommendedThe cheapest and worst-absorbed form. Contains the highest elemental magnesium per capsule (60%) but only 4 to 5% is actually absorbed. More likely to cause GI side effects. Useful only as a budget laxative. Not recommended for correcting deficiency or therapeutic use.
Bioavailability
4-5%
GI tolerance
Poor
Price tier
$
Best for
Budget laxative (not recommended for supplementation)
Magnesium Chloride
Best for topical + oral flexibilityGood bioavailability in oral form. Also available as magnesium oil for topical application and bath flakes. The oral form was used in the Tarleton 2017 study that showed benefit for depression and anxiety. A versatile, well-absorbed option.
Bioavailability
20-30%
GI tolerance
Good
Price tier
$-$$
Best for
Topical use (oil/flakes)
Magnesium Sulfate (Epsom Salt)
Topical use onlyPrimarily for topical use in baths and soaks. Oral absorption is poor and can cause significant GI distress. IV magnesium sulfate is the medical standard for eclampsia treatment. As a supplement, there are much better options.
Bioavailability
Low (oral)
GI tolerance
Poor (oral)
Price tier
$
Best for
Bath soaks
Magnesium Orotate
Niche use for athletesMagnesium bonded to orotic acid, which is involved in DNA and RNA synthesis. Some research suggests benefit for cardiovascular conditions and exercise performance. Expensive and less commonly available. Limited research compared to glycinate and citrate.
Bioavailability
Moderate
GI tolerance
Good
Price tier
$$$
Best for
Cardiovascular health
Magnesium L-Aspartate
Adequate general optionMagnesium bonded to aspartic acid. Decent bioavailability. Often found in combination supplements (like ZMA, which combines zinc, magnesium aspartate, and B6). Less studied than glycinate or citrate for specific health goals.
Bioavailability
Moderate
GI tolerance
Moderate
Price tier
$$
Best for
General supplementation
Decision Matrix: If Your Goal Is X, Take Y
| Your goal | First choice | Alternative |
|---|---|---|
| Better sleep | Glycinate | Threonate |
| Reduce anxiety | Glycinate | Taurate |
| Constipation relief | Citrate | Oxide (budget) |
| Muscle cramps | Glycinate or Citrate | Malate |
| Pregnancy support | Glycinate | Citrate (for constipation) |
| Cognitive function | Threonate | Glycinate |
| Heart health | Taurate | Glycinate |
| Energy and fatigue | Malate | Citrate |
| Athletic performance | Malate or Orotate | Glycinate |
| General deficiency | Citrate | Glycinate |
| Budget option | Citrate | Chloride |
| Topical use | Chloride (oil/flakes) | Sulfate (Epsom salt) |
Disclaimer: This content is for educational purposes only. Consult your healthcare provider before starting any supplement, especially if you take medications or have health conditions.