Sports Research Magnesium L-Threonate Capsules 2000mg
- Magnesium
- Capsule
- Magnesium
- 90
- Better rated than 62%
A Magtein-branded magnesium L-threonate capsule at a robust 2000mg dose, worth considering specifically for its cognitive-support angle rather than as a general magnesium source.
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How it ranks among the 108 magnesium we track
4.7★ across 2,500 Amazon ratings, Bayesian-smoothed toward the category average.
2,500 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
20,000+ 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
Sports Research packs 2000mg of Magtein-brand magnesium L-threonate into a 90-count capsule bottle aimed at cognitive support, covering memory, focus and sleep. The vegan, non-GMO, gluten free capsules use a magnesium form researched for crossing into brain tissue more readily than standard magnesium salts.
Magnesium L-threonate is chemically different from the magnesium citrate or oxide found in cheaper multivitamins, and Magtein is the trademarked ingredient most studies on this form have used, so the branded sourcing here is a meaningful detail rather than marketing filler. At 2000mg per serving it is dosed toward the higher end of what is typically recommended for this compound.
- 2000mg Magtein magnesium L-threonate per serving
- 90 vegan capsules
- Non-GMO and gluten free
- Aimed at memory, focus and sleep support
Who it's for
Fits someone specifically seeking the L-threonate form for cognitive or sleep support rather than general magnesium repletion, where cheaper citrate or glycinate forms would do the job for less money. Not the right pick if you just need a basic mineral supplement.
Strengths and trade-offs
Drawn from this product's published specifications.
- Uses branded Magtein magnesium L-threonate, not a generic form
- 2000mg dose is on the higher end for this ingredient
- Vegan, non-GMO and gluten free capsules
- Magnesium L-threonate costs more per dose than citrate or glycinate forms
- Capsule count may require multiple daily servings depending on dosing
Performance notes
Magnesium L-threonate is formulated to be more bioavailable to brain tissue than other magnesium salts, which is the basis for its use in cognitive and sleep-support products. The 90-count bottle and capsule form allow servings to be split across the day if needed.
Specifications
| Brand | Sports |
|---|---|
| Model | FG377 |
| Form | Capsule |
| Supplement Type | Magnesium |
| Count | 90 |
| Benefits | Supports Cognitive Health* |
| Flavor | Unflavored |
| Diet | Gluten Free, Vegan |
| Allergens | Gluten Free |
Other Sports magnesium
How it compares
This product against the closest alternatives we track in magnesium.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Sports Research Magnesium L-Threonate Capsules 2000mgThis product | 4.7 / 5 | 2,500 | 4.6 / 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 Sports FG377
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What is Magtein?
Magtein is the trademarked brand name for the magnesium L-threonate ingredient used in this formula.
Is this the same as regular magnesium supplements?
No, magnesium L-threonate is a distinct chemical form from the citrate, oxide or glycinate typically found in general supplements.
How many capsules are in the bottle?
The bottle contains 90 capsules.