Metagenics | Magtein® Magnesium L-Threonate

Why you'll love Magtein^® Magnesium L-Threonate

Feel sharper and more focused with Magtein^® Magnesium L-Threonate. This clinically studied form of magnesium supports brain health by helping you think clearly, remember details, and stay mentally engaged throughout your day. Magtein is designed to support the cognitive health you rely on every day.^* 

• Supports memory so you can recall information more easily^*
• Helps you maintain focus and concentration^*
• Supports clear thinking and decision-making^*
• May support healthy connections between brain cells (synapses)^*

The Science Inside 

• How It Works: Magtein^® is a special form of magnesium designed to cross the blood-brain barrier more easily, allowing it to reach brain cells more effectively. Once there, it can support healthy brain signaling and cognitive function. Magnesium is also critical for mitochondrial function, the energy "engines" inside every cell, including brain and nerve cells. By helping cells produce energy more efficiently, it supports working memory, focus, and overall cognitive performance.*
• Key Ingredient: Each serving (3 capsules) provides 2 g Magtein^® (magnesium L-threonate), delivering 147 mg elemental magnesium (35% Daily Value). This form was developed specifically for bioavailability and brain health.*

What makes Magtein^® Magnesium L-Threonate different? 

• Backed by Research: Features a form of magnesium shown in research to support cognitive performance and mental sharpness.*
• Brain-Health Focused: Unlike magnesium glycinate, which supports muscle relaxation and sleep, Magtein^® is specifically formulated to support your brain's health and cognitive function.*
• Clinical Results: Clinical studies show significant improvements in thinking and memory.*

^In a randomized, double-blind, placebo-controlled trial, Magtein® supplementation was associated with a statistically significant improvement in modeled cognitive age, corresponding to an estimated 7.5-year difference versus placebo, in healthy individuals age 18-45.

Lopresti AL and Smith SJ (2026) The effects of magnesium L-threonate (Magtein®) on cognitive performance and sleep quality in adults: a randomised, double-blind, placebo-controlled trial. Front. Nutr. 12:1729164

What is cognitive aging?

Cognitive aging describes changes in cognitive performance over time, including memory, processing speed, and attention. An estimated cognitive age is a modeled performance score that compares cognitive function to population norms, reflecting performance outcomes rather than biological age.

Triple tested. Practitioner trusted.

For over 40 years, Metagenics^® has led innovation in health supplements, exceeding industry standards for transparency and accountability. We guarantee that what’s on the label is what’s in the bottle, and that commitment is why we’re trusted by more than 50,000 healthcare providers worldwide. This, and all our formulas are also:

• Produced in GMP certified facilities to meet the highest quality standards.
• Science-backed: We perform +200K quality tests annually, from ingredient sourcing to finished product, for accuracy and consistency.
• Triple tested: All our products are verified for identity, purity, strength, and stability at three levels of production: ingredient, formula, and encapsulation.
• Metagenics is the #1 Doctor-Recommended Professional Supplement Brand^★ trusted by 50,000 healthcare practitioners.
• Environmentally Responsible: As a registered B-Corp, sustainability matters; all our products are made ethically, responsibly, and with purpose.
• Risk Free: Every purchase is backed by our 60-Day Money Back Guarantee.

Allergen Information

Non-GMO | Gluten-Free | Lactose-Free | Sugar-Free | Free From Artificial Preservatives | Vegetarian

Directions: Recommended Dosage: Three capsules daily provide 2 g Magtein® (magnesium L-threonate) delivering 147 mg elemental magnesium.

Best Time to Take: Take one capsule in the morning and two capsules approximately two hours before bedtime, or as directed by your healthcare provider.

Who It's For: Adults seeking support for cognitive function and mental clarity. Safe for daily use.*

Safety: If you are pregnant, nursing, taking medication, or have a medical condition, consult your healthcare practitioner before use. Keep out of reach of children.

Storage: Dry Place

Available through our authorized Metagenics storefront. Purchases are completed on the official Metagenics store.