Kappa Nutrition Powered by MagbrainTM Magnesium L-Threonate Plant-Based
- Magnesium
- Capsule
- Magnesium
- 120
- Better rated than 62%
- More reviewed than 63%
Buyers seeking magnesium's brain and sleep benefits specifically will find the L-threonate form and stated elemental dose reassuring, even with the three-capsule serving.
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How it ranks among the 108 magnesium we track
4.7★ across 6,400 Amazon ratings, Bayesian-smoothed toward the category average.
6,400 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
7,000+ 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
Kappa Nutrition's magnesium L-threonate capsule, marketed under the MagbrainTM name, provides 420 mg of elemental magnesium from 2,253 mg of compound across a three-capsule serving, 120 vegan capsules per bottle, aimed at brain, sleep and muscle support.
Magnesium L-threonate is a form studied for its ability to cross the blood-brain barrier more readily than other magnesium types, which is why it is marketed toward brain and sleep support rather than general mineral supplementation. The three-capsule serving size means the 120-count bottle provides about 40 servings, not 120 days of use.
- 420 mg elemental magnesium per 3-capsule serving
- Magnesium L-threonate (MagbrainTM) form
- 120 vegan capsules per bottle
- Marketed for brain, sleep and muscle support
Who it's for
For people specifically seeking magnesium's cognitive or sleep-support angle rather than a general-purpose mineral supplement, and who do not mind a three-capsule serving. Not for anyone wanting a single-capsule daily dose.
Strengths and trade-offs
Drawn from this product's published specifications.
- L-threonate form targeted at brain and sleep support
- Elemental magnesium dose clearly stated
- Three-capsule serving means the bottle lasts about 40 days
- Higher-cost magnesium form than glycinate or oxide
Performance notes
Magnesium L-threonate is formulated to raise magnesium levels in the brain more effectively than other magnesium salts, the basis for its use in sleep and cognitive-support products. Delivering 420 mg of elemental magnesium requires three capsules per serving, so the 120-capsule bottle provides roughly 40 servings rather than 120 days.
Specifications
| Brand | Kappa |
|---|---|
| Model | MAG2617 |
| Form | Capsule |
| Supplement Type | Magnesium |
| Count | 120 |
| Benefits | Supports brain health, focus, restful sleep, muscle function, and energy with a |
| Flavor | Unflavored |
| Diet | Vegan |
How it compares
This product against the closest alternatives we track in magnesium.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Kappa Nutrition Powered by MagbrainTM Magnesium L-Threonate Plant-BasedThis product | 4.7 / 5 | 6,400 | 4.7 / 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 Kappa MAG2617
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How much elemental magnesium is in a serving of Kappa Nutrition's Magnesium L-Threonate (model MAG2617)?
A three-capsule serving provides 420 mg of elemental magnesium from 2,253 mg of the L-threonate compound.
How many servings are in a bottle of Kappa Nutrition Magnesium L-Threonate?
With 120 capsules and a three-capsule serving size, the bottle provides about 40 servings.
Is Kappa Nutrition's Magnesium L-Threonate vegan?
Yes, the capsules are formulated as vegan.