All Magnesium L-Threonate Brain & Sleep Supplements Reviews

We've independently tested 10 Mag Threonate supplements. Each review includes lab analysis, user trial data, and our expert assessment.

#1 MOST RECOMMENDED

9.5 /10

Nutricost Magtein Magnesium L-Threonate

Magnesium Form Magtein® L-Threonate

Elemental Mg 144 mg/serving

Form Capsule (3/day)

Price $43.97/mo

Magtein® Certified Yes

ISO-Accredited Testing Yes

Patented Magtein® at the full clinical dose (2,000 mg/day)

ISO-accredited third-party lab testing for potency and purity

NSF GMP-certified manufacturing facility

No unnecessary fillers — clean, direct formula

Magtein® CertifiedGMPNon-GMO

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#2 BEST PURITY

9.3 /10

Double Wood Magnesium L-Threonate

Magnesium Form Magtein® L-Threonate

Elemental Mg 144 mg/serving

Form Capsule (3/day)

Price $30.95/mo

Magtein® Certified Yes

Additives Minimal

Full Magtein® dose with the cleanest excipient list in the category

Third-party tested with publicly available certificates of analysis

cGMP-certified US manufacturing

Ultra-minimalist formula — rice flour and capsule only

Magtein® CertifiedGMPNon-GMO

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#3 BEST VALUE

9.1 /10

NOW Foods Magtein® Magnesium L-Threonate

Magnesium Form Magtein® L-Threonate

Elemental Mg 135 mg/serving

Form Capsule (3/day)

Price $29.95/mo

Magtein® Certified Yes

Widely Available Retail + Online

Patented Magtein® at the most accessible price in the category

50+ years of NOW Foods quality manufacturing

Available in major retail stores and online

Non-GMO, vegetarian, and kosher certified

Magtein® CertifiedNon-GMOVegetarianKosher

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#4 SCIENCE-BACKED

8.9 /10

Life Extension Neuro-Mag Magnesium L-Threonate

Magnesium Form Magtein® L-Threonate

Elemental Mg 144 mg/serving

Form Capsule (3/day)

Price $31.50/mo

Magtein® Certified Yes

Brand Heritage 40+ years

Uses patented Magtein® at the full clinical dose

40+ years of Life Extension supplement research behind the formula

Third-party tested with certificates of analysis

Vegetarian capsules with minimal excipients

Magtein® CertifiedNon-GMOVegetarian

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#5 TRUSTED

8.7 /10

Jarrow Formulas MagMind

Magnesium Form Magtein® L-Threonate

Elemental Mg 144 mg/serving

Form Capsule (3/day)

Price $32.96/mo

Magtein® Certified Yes

Memory Focus Primary claim

Magtein® blend for memory and stress support

Jarrow's 30+ year reputation in quality supplement manufacturing

Vegetarian capsules free from common allergens

Full Magtein® dose in 3-capsule serving

VegetarianGMPNon-GMO

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#6 EDITOR'S CHOICE

8.6 /10

Momentous Magnesium L-Threonate

Magnesium Form Magtein® L-Threonate

Elemental Mg 144 mg/serving

Form Vegan Capsule (3/day)

Price ~$40–44/mo

NSF Certified For Sport

Vegan Yes

NSF Certified for Sport — trusted by professional athletes

Vegan capsules with zero animal-derived excipients

Performance-focused brain and sleep formula

Endorsed by top scientists and performance coaches

Magtein® CertifiedNSF Certified for SportVegan

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#7 BEST POWDER

8.5 /10

Doctor's Best Magnesium L-Threonate Powder

Magnesium Form Magtein® L-Threonate

Elemental Mg 144 mg/serving

Form Powder (scoop)

Price $38.99 (75 srv)

Magtein® Certified Yes

Flexible Dosing Yes

Only major powder-format Magtein® supplement

Tasteless and dissolves easily in water or juice

Full clinical Magtein® dose per scoop

75 servings per container — excellent cost-per-dose

Magtein® CertifiedNon-GMOVegetarian

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#8 POPULAR

8.1 /10

Source Naturals Magtein®

Magnesium Form Magtein® L-Threonate

Elemental Mg 144 mg/serving

Form Capsule (3/day)

Price $30.79 (60 srv)

Magtein® Certified Yes

Large Count 180 capsules

180-capsule bottle provides a full 60-serving supply

40+ year brand heritage (founded 1982)

Full Magtein® dose per 3-capsule serving

Widely available through health food retail

Magtein® CertifiedNon-GMOVegetarian

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#9 PREMIUM

8.0 /10

Metagenics Magtein

Magnesium Form Magtein® L-Threonate

Elemental Mg 144 mg/serving

Form Capsule (3/day)

Price ~$40–50/mo

Practitioner-Grade Yes

Clinical Channel Yes

Practitioner-grade Magtein® sold primarily through healthcare providers

Rigorous internal QC with clinical documentation program

Full Magtein® dose with strict excipient controls

Trusted by integrative medicine practitioners worldwide

Magtein® CertifiedGluten-FreeNon-GMO

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#10 INNOVATIVE

7.8 /10

LivOn Labs Lypo-Spheric Magnesium L-Threonate

Magnesium Form Liposomal L-Threonate

Delivery System Liposomal

Form Sachet (liquid)

Price $67.95/mo

Liposomal Max Absorption

No Capsule Sachet format

Liposomal delivery for enhanced gastrointestinal absorption

Unique sachet format — no capsule swallowing

Theoretically highest bioavailability of all formats

LivOn Labs' 20 years of liposomal supplement expertise

Non-GMOGMP

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