Magnesium Glycinate 400mg vs Life Extension Neuro-Mag Magnesium L-Threonate
Side-by-side comparison of scores, ingredients, prices and real customer feedback for Magnesium Glycinate 400mg and Life Extension Neuro-Mag Magnesium L-Threonate.
Last verified: 07 Apr 2026 · Based on 144 reviews
Magnesium Glycinate 400mg scores 80.0/100 vs Life Extension Neuro-Mag Magnesium L-Threonate at 73.0/100. Magnesium Glycinate 400mg wins on effectiveness, ingredient quality, value for money.
Which is better: Magnesium Glycinate 400mg or Life Extension Neuro-Mag Ma...?
Solgar Magnesium Glycinate wins on score (80 vs 73) and value at just £12.25 versus £37.90. It suits most people seeking better sleep, muscle recovery, or stress relief. Choose Life Extension Neuro-Mag if cognitive support or memory is your specific goal — the Magtein form is uniquely suited for crossing the blood-brain barrier.
— AIScored Editorial Team
How Do the Scores Compare?
Magnesium Glycinate 400mg
Solgar
|
Life Extension Neuro-Mag Ma...
Life Extension
|
|
|---|---|---|
| Overall Score | 80.0 | 73.0 |
| Effectiveness |
79.0/100
Best
|
73.0/100 |
| Ingredient Quality |
88.0/100
Best
|
86.0/100 |
| Value for Money |
70.0/100
Best
|
52.0/100 |
| Side Effects |
76.0/100
Best
|
76.0/100
Best
|
| Certifications |
84.0/100
Best
|
80.0/100 |
| Best Price |
£12.25
Amazon UK →
Cheapest
|
£37.90 Amazon UK → |
| Price per Serving | N/A | £1.26 30 servings |
| Form | N/A | Capsules |
| Dose | N/A | 2000mg Magtein (144mg elemental Mg) |
| Third-Party Tested | ✗ No | ✓ Yes |
| Reviews Analysed | 76 | 68 |
Magnesium Glycinate 400mg
Pros
- ✓Strong user-reported improvement in sleep quality — faster onset and fewer nighttime awakenings
- ✓Effective at reducing leg cramps, muscle tension, and post-exercise soreness
- ✓Glycinate chelate offers high bioavailability and is generally gentle on the digestive system
- ✓Clean, minimal formula — gluten-free, dairy-free, non-GMO, kosher-certified; trusted Solgar brand
Cons
- ✗Paradoxical insomnia or restless sleep in a subset of users, possibly linked to MTHFR mutations or glycine sensitivity — magnesium threonate may suit these individuals better
- ✗Large tablet/capsule size noted as inconvenient by multiple reviewers
- ✗Premium brand pricing is higher than comparable chelated magnesium products
- ✗High doses may disrupt calcium balance, contributing to eye twitching or muscle symptoms in some users
Best For
Life Extension Neuro-Mag Magnesi...
Pros
- ✓Magtein (patented Mg L-threonate) is the most researched form for crossing the blood-brain barrier and supporting cognitive function
- ✓Reviewers consistently report improved memory, concentration, and reduced brain fog after several weeks of use
- ✓Sleep quality improvements frequently mentioned — easier to fall asleep, fewer nighttime awakenings
- ✓Clean formula: vegan capsules, no dairy, gluten, soy, or artificial flavours; third-party tested
Cons
- ✗Premium pricing with only 30 servings per bottle makes ongoing use costly compared to standard magnesium forms
- ✗High capsule load (3 per serving) due to low elemental magnesium yield of the L-threonate form
- ✗Some users report vivid dreams or mild sleep disruption, especially if taken close to bedtime
- ✗Effects are gradual — requires 2–4 weeks of consistent use before benefits are noticeable
Best For
What does the data say about Magnesium Glycinate 400mg vs Life Extension Neuro-M...?
These two magnesium supplements differ fundamentally in what they're designed to do. Solgar's Magnesium Glycinate delivers magnesium bound to glycine, an amino acid that aids absorption and is easy on the stomach — a practical, well-understood form that scores 88/100 for ingredient quality at £12.25. Life Extension's Neuro-Mag uses magnesium L-threonate (branded Magtein), a patented form specifically developed to cross the blood-brain barrier. Each serving provides just 144mg of elemental magnesium from 2,000mg of Magtein — a low yield that explains the three-capsule-per-serving requirement — but the mechanism targets neural tissue rather than general body stores.
If your goal is better sleep, fewer muscle cramps, or managing stress and anxiety, the Solgar at £12.25 is the sensible pick. It scores 80/100 overall, reviewers consistently report real improvements in sleep and muscle tension, and the cost per month is modest. The caveat: a minority of users experience paradoxical restless sleep, possibly linked to glycine sensitivity, in which case threonate is worth considering. If you're specifically after cognitive support — memory, focus, reducing brain fog — the Life Extension option at 73/100 has the research behind it, but at £37.90 for just 30 servings, the value score of 52/100 reflects a genuine affordability problem for daily long-term use.
Practically, Solgar's tablets run large, which some people find awkward to swallow. The Life Extension capsules are smaller individually but you're taking three at once. Worth noting: Life Extension is third-party tested; Solgar is not — a meaningful difference if certification matters to you. Neither lists allergen concerns beyond standard capsule shells, but check individual listings if you have specific sensitivities.
Solgar Magnesium Glycinate 400mg is a premium chelated magnesium supplement widely praised by reviewers for improving sleep quality, reducing muscle cramps, and easing nervous tension.
What are the key differences?
Frequently Asked Questions
Which is better, Magnesium Glycinate 400mg or Life Extension Neuro-Mag Magnesium L-Threonate? ▼
Is Magnesium Glycinate 400mg worth the price compared to Life Extension Neuro-Mag Magnesium L-Threonate? ▼
Which has fewer side effects? ▼
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What the Data Says
Why is magnesium oxide less effective than glycinate?
Oxide scores 21 points lower than glycinate in our testing — and it's not close on ingredient quality either. Across 17 magnesium products in our database, glycinate averages 74.3/100 overall. Oxide sits at 53/100. That's a gap you can feel.
The ingredient quality difference is even starker: 83.3 for glycinate vs 37.0 for oxide. A 46.3-point gap. The best glycinate in our database, Solgar Magnesium Glycinate 400mg, scores 80/100 overall with 88/100 on ingredient quality. The oxide product (Nature Made) manages just 52 on effectiveness and 37 on ingredient quality.
The reason is bioavailability. Magnesium oxide has roughly 4% absorption — most of it passes straight through your gut unused. Glycinate is chelated (bound to the amino acid glycine), which your intestines absorb much more efficiently. You also get fewer digestive side effects, since unabsorbed magnesium in the gut is what causes the laxative effect oxide is known for.
Oxide is cheap, which is why it's still everywhere. But cheap per pill means nothing if your body can't use it. Glycinate or citrate (avg 74.5/100) are both better choices.
Which form of magnesium is best for sleep, anxiety, or muscle cramps?
Glycinate for sleep and anxiety. Citrate for cramps. L-threonate for brain function. Each form has a different strength, and our scores back this up.
Sleep and anxiety → Glycinate. Averaging 74.3/100 across our database, with the best (Solgar Glycinate 400mg) hitting 80/100. Glycine, the amino acid it's bound to, acts as an inhibitory neurotransmitter — it calms your nervous system on its own. That's a two-for-one benefit you don't get from other forms. Thorne Bisglycinate (74/100) is another solid option at a lower dose.
Muscle cramps → Citrate. Averaging 74.5/100 overall with 85.0 on ingredient quality. Citrate absorbs well and is gentler on your wallet than glycinate. Solgar Citrate leads the pack at 77/100. If cramps are your main issue, this is the practical choice.
Brain function → L-Threonate. Life Extension Neuro-Mag scores 73/100. This is the only form shown to meaningfully raise magnesium levels in the brain by crossing the blood-brain barrier. It's pricier, but nothing else does what it does.
All-round absorption → Doctor's Best High Absorption tops our entire magnesium database at 82/100 overall (83 effectiveness, 88 ingredient quality) using chelated magnesium.
The one form to skip? Oxide at 53/100. Its 4% absorption rate makes it a poor choice no matter what you're taking it for.
Disclaimer: AIScored provides data-driven comparisons based on publicly available reviews. This is not medical advice. Affiliate links may earn us a commission at no extra cost to you.
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