Head to head · Sleep & Stress
Life Extension Neuro-Mag Magnesium L-Threonate vs Sports Research L-Theanine 200 mg with Suntheanine
Sports Research scores higher overall (8.0 vs 7.2 out of 10) and leads on four of the five factors we score.
Updated September 2026 from our full reviews · How we score
A best-selling Magtein supplement at the full 2 g trial dose. Sleep evidence is early and industry-funded, and at about $1 a day it costs far more than other magnesium.
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A simple, well-dosed 200 mg Suntheanine softgel for calm focus and wind-down, at about $0.33 a day. Contains gelatin and coconut.
We may earn a commission when you buy through these links — it never affects our scores. How we make money
We may earn a commission when you buy through these links — it never affects our scores. How we make money
The short answer
Choose Life Extension if…
- People curious about Magtein for sleep and focus
- Those who get loose stools from other magnesium forms
- Shoppers who want a vegetarian, single-ingredient capsule
Choose Sports Research if…
- Stress and racing thoughts at bedtime
- Calm focus without drowsiness
- People who want a single-ingredient formula
- You care most about efficacy, value, experience, transparency
- You want the lower cost per serving ($0.33)
Side by side
| Neuro-Mag Magnesium L-Threonate | L-Theanine 200 mg with Suntheanine | |
|---|---|---|
| Our score | 7.2 / 10 | 8.0 / 10 |
| Efficacy (30%) | 6.8 | 7.8 |
| Quality & Purity (25%) | 7.5 | 7.5 |
| Value (20%) | 6.5 | 8.3 |
| Experience (15%) | 8.0 | 8.5 |
| Transparency (10%) | 8.2 | 8.8 |
| Form | Capsule | Softgel |
| Serving | 3 vegetarian capsules30 servings per container | 1 softgel60 servings per container |
| Price per serving | $1.05 | $0.33 |
| Testing & certifications | cGMP facilityThird-party tested | Third-party testedcGMP facility |
| Dietary | Vegetarian, Gluten-free, Non-GMO | Gluten-free, Non-GMO |
| Key ingredients |
|
|
| Flavors | — | — |
| Creator video reviews | 5 | 3 |
Pros and cons
Neuro-Mag Magnesium L-Threonate
- 2,000 mg Magtein per serving, the same daily dose used in the most recent clinical trial
- Single-ingredient formula with a full, simple label
- 144 mg elemental magnesium stays well below the 350 mg supplemental upper limit
- Vegetarian, gluten-free and non-GMO capsules
- buyers frequently report better sleep and a calmer mind
- Sleep evidence rests on two small, industry-funded trials with mixed objective results
- About $1.05 per serving at list price, several times the cost of magnesium glycinate
- Three capsules per day, and some buyers report cramps
- No NSF, USP or similar product certification; certificates of analysis only on request
L-Theanine 200 mg with Suntheanine
- 200 mg Suntheanine per softgel, matching the dose used in a 2019 randomized trial
- Single active ingredient with a short, fully disclosed label
- Third-party tested, cGMP-compliant, gluten-free and IGEN Non-GMO tested
- About $0.33 per serving at list price
- Gelatin softgel is not suitable for vegetarians; label lists coconut as a tree-nut allergen
- Some buyers report stomach upset, and the softgels are on the larger side
- No NSF, USP or similar product certification
- Effects are subtle; 200 mg is at the low end of the dose range linked to better sleep
Our verdicts
Neuro-Mag Magnesium L-Threonate
Neuro-Mag is a clean, accurately dosed version of Magtein from an established brand, and many buyers say it helps them sleep and think more clearly. The research behind magnesium L-threonate for sleep is still small and industry-funded, so we see it as a reasonable but expensive experiment rather than a proven sleep aid. If you simply want more magnesium, cheaper forms deliver more of the mineral per dollar.
Full review
L-Theanine 200 mg with Suntheanine
This is an easy recommendation for anyone who wants to try L-theanine: a studied dose of a branded ingredient, a transparent label and consistently strong buyer feedback. Expect subtle calm rather than a knockout effect, and choose a capsule version if you avoid gelatin or coconut.
Full review
What creators say
Questions people ask
Is Life Extension better than Sports Research?
Which is cheaper per serving, Life Extension or Sports Research?
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