Momentous Magnesium L-Threonate with Magtein, Sleep & Cognitive Support | 90 Capsules

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A brain-targeted magnesium that supports cognitive function, sleep quality + calm.
  • Crosses the blood-brain barrier boosting magnesium levels
  • Helps support learning, attention, and cognitive function
  • Promotes calm brain activity and improved sleep quality
  • NSF Certified for Sport®
  • 30 Servings Per Container
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HSA/FSA eligible

Pharmalynk Pro-Tip

Magnesium L-Threonate supports the brain at night, omega-3s support it around the clock. Pair it with Momentous Omega-3 Softgel Capsules, an NSF Certified fish oil delivering the EPA and DHA your brain uses for cell membrane structure and cognitive health. Both are HSA/FSA eligible and available on Autoship for 15% off every delivery.

† These statements have not been evaluated by the food and drug administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Momentous Magnesium L-Threonate with Magtein, Sleep & Cognitive Support | 90 Capsules

Momentous Magnesium L-Threonate with Magtein, Sleep & Cognitive Support | 90 Capsules

Regular price $49.95
Sale price $49.95 Regular price
Unit price
Magnesium designed to reach the brain.

Magnesium designed to reach the brain.

Formulated with Magtein®, a clinically studied form of magnesium L-threonate shown to increase magnesium levels in the brain. Designed to support cognitive function, relaxation, and deep, restorative sleep.

Frequently asked questions

Find clear, helpful answers to the most common questions about Momentous Magnesium L-Threonate with Magtein, Sleep & Cognitive Support | 90 Capsules.

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Magnesium L-Threonate is a form of magnesium bound to threonic acid, which acts as a carrier to help magnesium cross the blood-brain barrier more effectively than other forms. That makes it the form typically chosen when the goal is brain magnesium levels rather than general magnesium intake.
Magtein is the patented, clinically studied form of Magnesium L-Threonate used in the published research on this ingredient. Momentous includes 2 g of Magtein per serving, delivering 145 mg of elemental magnesium.
Magnesium L-Threonate can support healthy sleep patterns. It supports neurotransmitter balance and healthy synaptic activity, which helps promote relaxation and sleep quality without a heavy or sedated feeling.
For sleep and relaxation, take all 3 capsules 30 to 60 minutes before bed. If the goal is cognitive support during the day, the dose can instead be spread across meals, one capsule at a time, to support focus without drowsiness.
Many people notice improvements in sleep quality within the first 7 days. Brain magnesium levels build gradually, so roughly 4 weeks of consistent daily use is typically needed for the full cognitive benefits. Results vary from person to person.
Yes. Magnesium L-Threonate is designed for consistent daily use, and regular supplementation is how magnesium levels build and stay elevated over time.
Magnesium L-Threonate is generally well tolerated. High doses may cause digestive discomfort in some people. Start with the recommended serving and adjust based on individual tolerance, and consult a healthcare professional if you are pregnant, nursing, taking medication, or managing a medical condition.
Yes. Momentous Magnesium L-Threonate is vegan, gluten free, dairy free, soy free, and GMO free. The capsule uses plant-derived cellulose, though it may not be corn-free, so consult a healthcare provider if you have a corn sensitivity.
Forms such as magnesium citrate, oxide, and glycinate vary in absorption and in where they act in the body. Magnesium L-Threonate is specifically selected for its ability to raise magnesium levels in the brain, which is why it is used for cognitive and sleep support rather than general supplementation.
Yes. Every finished batch is independently tested to verify label accuracy and screen for banned substances. Momentous also makes Certificates of Analysis available for every batch.

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We started Momentous to bring credibility back to supplements. That means science-backed ingredients, expert formulation, and independent testing that verifies what’s inside every product. Guided by the Momentous Standard®, we don’t chase perfection—we pursue progress, raising the bar for sourcing, science, and testing in service of Performance for Life™.
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