MagnesiumScience

Evidence-ranked comparison

Best Magnesium Supplements: A Research-Informed Comparison

Magnesium is an essential dietary mineral and a cofactor in hundreds of enzyme systems. This page compares popular magnesium supplements on the form used (most are magnesium glycinate, a well-absorbed chelate), the labeled amount, label transparency, and whether testing is independently certified. We summarize magnesium only as an essential mineral and enzyme cofactor — we make no claims about sleep, mood, blood pressure, or any health condition. We do not display prices or ratings, value is not part of the score, and Amazon popularity is only an eligibility signal.

Quick picks
Best Overall

Doctor's Best — Doctor's Best High Absorption Magnesium Glycinate Lysinate

Magnesium glycinate/lysinate chelate (TRAACS), tablet · 200 mg elemental magnesium per serving

How we evaluated

We started from magnesium supplements appearing among the leading Amazon listings observed on June 19, 2026 — dominated by magnesium glycinate — kept distinct product lines including one magnesium L-threonate option, removed duplicate size variations, and avoided multi-ingredient blends that obscure the magnesium amount. We then scored each on our published methodology. We do not score value, because we do not publish a verified current price.

Ingredient form & formula28%Clinically relevant labeled amount22%Label transparency17%Third-party testing & certification17%Excipients & additives11%Serving convenience5%

See the full methodology →

At a glance

Comparison of the ranked products by form, labeled serving, testing, and editorial score.
#ProductFormLabeled servingTestingScore
1Doctor's Best — Doctor's Best High Absorption Magnesium Glycinate LysinateBest OverallMagnesium glycinate/lysinate chelate (TRAACS), tablet200 mg elemental magnesium per servingBrand states third-party tested8.5
2Double Wood — Double Wood Magnesium GlycinateMagnesium glycinate, capsule400 mg magnesium glycinate per serving (2 capsules)Testing not independently verified7.7
3NatureBell — NatureBell Magnesium GlycinateMagnesium glycinate, capsule500 mg magnesium glycinate per servingTesting not independently verified7.7
4Nature's Bounty — Nature's Bounty Magnesium GlycinateMagnesium glycinate240 mg magnesium glycinate per servingTesting not independently verified7.7
5Thorne — Thorne Magnesium GlycinateMagnesium glycinate (bisglycinate chelate), capsuleMagnesium (as magnesium glycinate)Brand states third-party tested7.6
6Life Extension — Life Extension Neuro-Mag Magnesium L-ThreonateMagnesium L-threonate (Magtein), capsule144 mg elemental magnesium per serving (3 capsules)Testing not independently verified7.5
7Pure Encapsulations — Pure Encapsulations Magnesium (Glycinate)Magnesium glycinate (chelate), capsuleMagnesium (as magnesium glycinate)Testing not independently verified7.1
#1 Doctor's Best — Doctor's Best High Absorption Magnesium Glycinate Lysinate8.5

Magnesium glycinate/lysinate chelate (TRAACS), tablet · 200 mg elemental magnesium per serving · Brand states third-party tested · Best Overall

#2 Double Wood — Double Wood Magnesium Glycinate7.7

Magnesium glycinate, capsule · 400 mg magnesium glycinate per serving (2 capsules) · Testing not independently verified

#3 NatureBell — NatureBell Magnesium Glycinate7.7

Magnesium glycinate, capsule · 500 mg magnesium glycinate per serving · Testing not independently verified

#4 Nature's Bounty — Nature's Bounty Magnesium Glycinate7.7

Magnesium glycinate · 240 mg magnesium glycinate per serving · Testing not independently verified

#5 Thorne — Thorne Magnesium Glycinate7.6

Magnesium glycinate (bisglycinate chelate), capsule · Magnesium (as magnesium glycinate) · Brand states third-party tested

#6 Life Extension — Life Extension Neuro-Mag Magnesium L-Threonate7.5

Magnesium L-threonate (Magtein), capsule · 144 mg elemental magnesium per serving (3 capsules) · Testing not independently verified

#7 Pure Encapsulations — Pure Encapsulations Magnesium (Glycinate)7.1

Magnesium glycinate (chelate), capsule · Magnesium (as magnesium glycinate) · Testing not independently verified

The products, ranked

1

Doctor's Best High Absorption Magnesium Glycinate Lysinate

Doctor's Best

Best Overall

Provides magnesium, an essential mineral and enzyme cofactor, as a chelated glycinate/lysinate. This is a mineral supplement; no condition-specific claims are made.

Form
Magnesium glycinate/lysinate chelate (TRAACS), tablet
Labeled serving
200 mg elemental magnesium per serving
Count / size
240 tablets (120 servings)
Testing
Brand states third-party tested

Strengths

  • Clearly labels 200 mg elemental magnesium per serving
  • Well-absorbed TRAACS glycinate/lysinate chelate
  • Brand states the product is third-party tested
  • Single-form magnesium, no proprietary blend

Limitations

  • Third-party testing is a brand statement, not an independent certification we could verify
  • Tablets are larger than some capsule options
8.5 / 10View on Amazon
2

Double Wood Magnesium Glycinate

Double Wood

Provides magnesium, an essential mineral and enzyme cofactor, as magnesium glycinate. This is a mineral supplement; no condition-specific claims are made.

Form
Magnesium glycinate, capsule
Labeled serving
400 mg magnesium glycinate per serving (2 capsules)
Count / size
180 capsules (90 servings)
Testing
Testing not independently verified

Strengths

  • Magnesium glycinate in a single-form capsule
  • Clearly labeled 400 mg per serving
  • Single-form, no proprietary blend

Limitations

  • We could not independently verify a third-party certification for this listing
  • Labeled as magnesium glycinate (the chelated compound); elemental magnesium is a fraction of that weight
7.7 / 10View on Amazon
3

NatureBell Magnesium Glycinate

NatureBell

Provides magnesium, an essential mineral and enzyme cofactor, as magnesium glycinate. This is a mineral supplement; no condition-specific claims are made.

Form
Magnesium glycinate, capsule
Labeled serving
500 mg magnesium glycinate per serving
Count / size
240 capsules
Testing
Testing not independently verified

Strengths

  • Magnesium glycinate in a single-form capsule
  • High capsule count per bottle
  • Clearly labeled per-serving amount

Limitations

  • We could not independently verify a third-party certification for this listing
  • Labeled as magnesium glycinate (the chelated compound); elemental magnesium is a fraction of that weight
7.7 / 10View on Amazon
4

Nature's Bounty Magnesium Glycinate

Nature's Bounty

Provides magnesium, an essential mineral and enzyme cofactor, as magnesium glycinate. This is a mineral supplement; no condition-specific claims are made.

Form
Magnesium glycinate
Labeled serving
240 mg magnesium glycinate per serving
Count / size
120 count
Testing
Testing not independently verified

Strengths

  • Widely available mainstream brand
  • Single-form magnesium glycinate
  • Clearly labeled per-serving amount

Limitations

  • We could not independently verify a third-party certification for this listing
  • Lower labeled amount than several other options
7.7 / 10View on Amazon
5

Thorne Magnesium Glycinate

Thorne

Provides magnesium, an essential mineral and enzyme cofactor, as the well-absorbed bisglycinate chelate. This is a mineral supplement; no condition-specific claims are made.

Form
Magnesium glycinate (bisglycinate chelate), capsule
Labeled serving
Magnesium (as magnesium glycinate)
Count / size
90 servings
Testing
Brand states third-party tested

Strengths

  • Magnesium glycinate (bisglycinate), a well-absorbed chelated form
  • Thorne states the product is third-party tested
  • Single-form magnesium, no blended fillers

Limitations

  • Brand statement of third-party testing, not independently verified by us
  • Single-form glycinate capsule only
7.6 / 10View on Amazon
6

Life Extension Neuro-Mag Magnesium L-Threonate

Life Extension

Provides magnesium, an essential mineral and enzyme cofactor, in the L-threonate form. We summarize magnesium only as an essential mineral; we make no cognitive or other condition-specific claims for this form.

Form
Magnesium L-threonate (Magtein), capsule
Labeled serving
144 mg elemental magnesium per serving (3 capsules)
Count / size
90 capsules (30 servings)
Testing
Testing not independently verified

Strengths

  • Clearly labels 144 mg elemental magnesium per serving
  • A distinct L-threonate form for those seeking it
  • Single-form, no proprietary blend

Limitations

  • Marketed around cognition; we make no cognitive claims and summarize magnesium only as an essential mineral and enzyme cofactor
  • Lower elemental magnesium per serving than the glycinate options
  • We could not independently verify a third-party certification for this listing
7.5 / 10View on Amazon
7

Pure Encapsulations Magnesium (Glycinate)

Pure Encapsulations

Provides magnesium, an essential mineral and enzyme cofactor, as a glycinate chelate in a minimal-excipient capsule. This is a mineral supplement; no condition-specific claims are made.

Form
Magnesium glycinate (chelate), capsule
Labeled serving
Magnesium (as magnesium glycinate)
Count / size
90 capsules
Testing
Testing not independently verified

Strengths

  • Single-form magnesium glycinate with a short, transparent excipient list
  • Practitioner-oriented formulation
  • No proprietary blend

Limitations

  • We could not independently verify a third-party certification for this listing
  • Single-form glycinate capsule only
7.1 / 10View on Amazon

How we score products →