SUPPLEMENTS·LIFE EXTENSION
Life Extension Neuro-Mag Magnesium L-Threonate
4.4 · 12,000 reviews
Editor score8.1/10
Best for: Magtein buyers, published-CoA shoppers
Active
Magnesium L-threonate (Magtein) 144mg elemental
Form
Capsule (3/serving)
Count
90 capsules (30 servings)
Life Extension's three-capsule magnesium L-threonate, with published certificates of analysis.
Life Extension is a four-decade brand with published CoAs. The product uses three capsules per serving and costs more than glycinate products in our lineup.
Price across 3 retailers
Prices checked 2026-07-03amazon
AmazonBest price✓ Fast delivery · easy returns
Magnesium L-threonate (Magtein) 144mg elemental
$30.78
2026-08-09
Prices shown were last checked on 2026-07-03and can change at any time — the price on the retailer's site at checkout is the one that applies. As an Amazon Associate and affiliate we may earn a commission on purchases made through these links, at no extra cost to you.
How our prices work
We show the lowest price we found at our last check (2026-07-03) and the manufacturer's list price for comparison. Retail prices — Amazon's especially — move constantly, so treat these as a guide: the price shown on the retailer's own page at checkout is the one that applies. Tap through to see each retailer's current price.
Should you buy it?
What we like
- Lab-grade brand with published certificates
What to know before buying
- 3 capsules per serving
- 2-3x the price of glycinate
At a glance
ActiveMagnesium L-threonate (Magtein) 144mg elemental
FormCapsule (3/serving)
Count90 capsules (30 servings)
CertificationNon-GMO, CoA published
Best timeEvening
Best forThe neuro-magnesium
Compare with alternatives
Quick verdicts for the supplements 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 — 240 tablets from Doctor's Best.
→ Value-focused buyers, athletes
VS·HEAD-TO-HEAD
Life Extension Neuro-Mag Magnesium L-Threonate vs NOW Magnesium Citrate 200mg
The budget workhorse — citrate from a GMP-certified 50-year brand, at the lowest cost per mg in our lineup.
→ Budget magnesium buyers
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 $15.79 for 120 servings.
→ Single-ingredient theanine at the lowest cost per capsule
Decision support · what no other comparison site has
Take the quiz · 60 secNot sure which one is right for you?
Our 60-second sleep score quiz asks 8 questions and recommends the right sleep gear for your goals. Built by sleep engineers. Free, no signup.
More supplements we compared
See all →
Frequently asked questions
L-threonate vs glycinate — real difference?
See /natural-sleep-remedies for what the trial evidence actually shows.
Why three capsules?
The label lists three capsules per serving.
Is the premium worth it?
It costs more than the glycinate products in our lineup.
When do effects show?
See /natural-sleep-remedies for what the trial evidence actually shows.
Affiliate disclosure: SleepyHero earns a small commission when you buy through these links. It doesn't cost you extra. Reviews and rankings are editorial — we don't accept payment for placement.