Published by Paul Thompson |
Fact-checked against peer-reviewed sources | Updated March 2026

## What Is Magnesium?

Involved in 300+ enzymatic reactions. Most adults are deficient. Critical for sleep, stress, muscle function, and heart health.

Key benefits: Sleep quality, Stress reduction, Muscle relaxation, Heart rhythm, Bone health.

With dozens of Magnesium supplements on the market, choosing the right one matters. We evaluated the top options based on ingredient quality, dosage, bioavailability, third-party testing, and price per serving.

## Top Magnesium Supplements — Ranked

1 NOW Magnesium Glycinate
Best for Sleep
Price: $16.99 Serving: 200mg per serving
★★★★☆ 9.4/10

Glycinate form is the most bioavailable and gentle on the stomach. Best choice for sleep and relaxation.

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2 NOW Magnesium Citrate
Best Value
Price: $11.99 Serving: 200mg per serving
★★★★☆ 9.0/10

Citrate form with good absorption. Affordable daily magnesium from a trusted brand.

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3 Life Extension Magnesium Caps
Most Complete
Price: $12.00 Serving: 500mg mixed forms
★★★★☆ 9.1/10

Blend of citrate, oxide, succinate, and TRAACS glycinate. Covers all bases.

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## How We Tested

Our methodology: We evaluated each Magnesium supplement across five criteria: ingredient purity and form, dosage per serving, third-party lab testing, brand reputation and transparency, and value for money. Products that use bioavailable forms and disclose full lab results scored highest.

Every product on this list has been verified for accurate labeling, tested for heavy metals and contaminants, and evaluated by our research team. We update this list as new products enter the market and new research becomes available.

## What to Look For in a Magnesium Supplement

#### Correct Form

Not all forms of Magnesium are equally effective. Look for the most bioavailable version supported by clinical research.

#### Proper Dosage

Ensure the supplement provides a clinically effective dose per serving. Underdosed products waste your money.

#### Third-Party Tested

Independent testing (NSF, USP, IFOS, or ConsumerLab) verifies what is on the label is actually in the bottle.

#### Value Per Serving

Compare price per effective dose, not just per bottle. A pricier product with higher potency can be the better deal.

### Related Questions

Magnesium Deficiency Symptoms For Men Over 50 Magnesium Morning Or Night For Athletes Magnesium Natural Sources For Men
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