Magnesium Glycinate 400mg
- Magnesium
- Capsule
- Magnesium
- 120
A chelated magnesium glycinate formula at 400mg, sold as a 120 capsule, two month supply aimed at sleep and muscle support.
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How it ranks among the 108 magnesium we track
4.6★ across 3,400 Amazon ratings, Bayesian-smoothed toward the category average.
3,400 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
8,000+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 108 magnesium we track - how the scorecard works · full magnesium data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
This Magnesium Glycinate 400mg supplement uses a chelated formula aimed at sleep, muscle relaxation, heart and nerve support, packaged as 120 capsules for a two month supply.
Chelated magnesium glycinate is generally used over magnesium oxide when digestive tolerance matters, since glycinate forms tend to cause less gastrointestinal upset. The 120 capsule count is framed on the label as a two month supply, implying a two capsule daily serving.
- 120 capsules, 2 month supply
- 400mg magnesium glycinate
- Chelated, high absorption formula
- Model MCB120
Who it's for
Adults wanting a straightforward, single-form magnesium glycinate for sleep and muscle relaxation without added B vitamins or other minerals mixed in. Not the pick for anyone wanting the broader multi-form magnesium complexes sold elsewhere in this category.
Strengths and trade-offs
Drawn from this product's published specifications.
- 400mg chelated magnesium glycinate per the listing
- 120 capsules sized as a two month supply
- Marketed for sleep, muscle and nerve support
- No added B6 or other cofactor nutrients included
- No allergen information given in this listing
Performance notes
The chelated glycinate form is bound to the amino acid glycine, a combination generally chosen for gentler digestion and for glycine's own calming properties, part of why this formula is positioned for sleep and muscle relaxation rather than general mineral supplementation.
Specifications
| Brand | Magnesium |
|---|---|
| Model | MCB120 |
| Form | Capsule |
| Supplement Type | Magnesium |
| Count | 120 |
| Benefits | Muscle Pain Control, Sleep Support |
| Flavor | Unflavored |
Other Magnesium magnesium
How it compares
This product against the closest alternatives we track in magnesium.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Magnesium Glycinate 400mgThis product | 4.6 / 5 | 3,400 | 4.5 / 5 |
| Nature Made Magnesium Oxide 250 mgNATURE | 4.7 / 5 | 34,500 | 4.6 / 5 |
| NaturalSlim MagicMag Magnesium Citrate Powder for StressNaturalSlim | 4.7 / 5 | 26,700 | 4.6 / 5 |
| NOW Supplements, Magnesium Citrate, Enzyme Function*, Nervous System Support*, 120 Veg…Now | 4.7 / 5 | 25,200 | 4.6 / 5 |
| Life Extension Magnesium CapsLife | 4.7 / 5 | 16,700 | 4.6 / 5 |
Similar magnesium from other brands
Questions about the Magnesium MCB120
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How many capsules does this magnesium supply come with?
120 capsules, marketed as a two month supply.
What form of magnesium is used?
Chelated magnesium glycinate at 400mg.
What is this magnesium supplement used for?
The listing markets it for sleep, calm, muscle relaxation, and heart, bone and nerve support.