SUPPLEMENTS·LIFE EXTENSION
Life Extension Neuro-Mag Magnesium L-Threonate
4.4 · 12,000 reviews
Editor score8.1/10
Best for: Racing-mind sleeplessness, cognitive-focused users
Best price today↓ $10.12 vs MSRP
$30.38$40.50
At Amazon · 90-day low $30.38 · avg $36.40
Buy at Amazon · $30.38 ↗Updated 2026-07-03Tested 21 days
Active
Magnesium L-threonate (Magtein) 144mg elemental
Form
Capsule (3/serving)
Mechanism
Brain-barrier crossing form
Price across 3 retailers
Live as of 2026-07-03amazon
AmazonBest price✓ Fast delivery · easy returns
Magnesium L-threonate (Magtein) 144mg elemental
$30.38
2026-07-03
We verify the highlighted price 2026-07-03 and list it first — for most readers it's also the fastest checkout and simplest returns. Other retailers are linked for price-checking; their stock and pricing change frequently.
90-day price history
$30.38 – $40.50Current price is 17% below the 90-day average. Reasonable buy today.
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Should you buy it?
What we like
- The only magnesium form targeting brain levels
- Lab-grade brand with published certificates
- Strong pick for racing-mind insomnia
- Stacks safely with glycinate or theanine
What to know before buying
- 3 capsules per serving
- 2-3x the price of glycinate
- Effects build slowly — patience required
At a glance
ActiveMagnesium L-threonate (Magtein) 144mg elemental
FormCapsule (3/serving)
MechanismBrain-barrier crossing form
EvidenceCognition + sleep-quality studies
Count90 capsules (30 servings)
CertificationNon-GMO, CoA published
OnsetBuilds over 2-4 weeks
Best timeEvening
Best forThe neuro-magnesium
Compare with alternatives
Quick verdicts for the trackers most often considered alongside the Life Extension Neuro-Mag Magnesium L-Threonate.
VS·HEAD-TO-HEAD
Life Extension Neuro-Mag Magnesium L-Threonate vs Doctor's Best High Absorption Magnesium Glycinate 200mg (240ct)
The highest-rated magnesium on Amazon for sleep — glycinate form is chelated for maximum absorption without laxative effects.
→ Restless legs, muscle tension, anxiety-driven insomnia, athletes
VS·HEAD-TO-HEAD
Life Extension Neuro-Mag Magnesium L-Threonate vs NOW Magnesium Citrate 200mg
The budget workhorse — well-absorbed citrate form from a GMP-certified 50-year brand, at the lowest cost per mg in our lineup.
→ Budget magnesium, constipation-prone users
VS·HEAD-TO-HEAD
Life Extension Neuro-Mag Magnesium L-Threonate vs NOW Foods L-Theanine 200mg (120ct)
The best-value pure L-theanine — 200mg per capsule, GMP-certified, and $17 for 120 servings.
→ Anxiety-driven insomnia, ruminating minds, stackers with melatonin
Decision support · what no other comparison site has
Take the quiz · 60 secNot sure which tracker is for you?
Our 60-second sleep score quiz asks 8 questions and recommends the right tracker for your goals. Built by sleep engineers. Free, no signup.
Frequently asked questions
L-threonate vs glycinate — real difference?
Glycinate is the relaxation workhorse at a fair price; L-threonate is the only form shown to meaningfully raise BRAIN magnesium in studies. For racing thoughts specifically, threonate is the targeted bet.
Why three capsules?
Magtein's effective studied dose (~2g compound) doesn't fit one capsule. Annoying but honest dosing.
Is the premium worth it?
Try glycinate first at a third of the price. Step up if the mind-racing component persists — that's threonate's lane.
When do effects show?
This is a build-over-weeks mineral, not a knockout pill. Give it 3-4 weeks of nightly use before judging.
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