Product Description
You've tried magnesium before and didn't notice much. Here's why: most forms never reach the brain. They support muscles and gut health, but the sleep depth and cognitive sharpness athletes want require a form that crosses the blood-brain barrier — and most can't.
Momentous Magnesium L-Threonate is built specifically for your brain.
What Makes It Different
Magtein® Reaches the Brain Magtein® — the patented magnesium L-threonate in this formula — is clinically shown to increase magnesium levels in the brain itself. That's where sleep quality and cognitive function actually improve.
Deep Sleep Without Sedation Brain magnesium regulates the nervous system signals behind restorative sleep. Low levels keep sleep shallow. Replenish them and the depth shifts — no melatonin, no morning grogginess.
NSF Certified for Sport — Every Batch Independently tested and third-party verified. Every bottle, every batch.
How to Use Momentous Magnesium L-Threonate
Take 3 capsules 30–60 minutes before bed. Sleep improvements typically show within the first week; cognitive benefits build over 3–4 weeks of consistent daily use.
- Gluten free
- Vegan
- Sport Tested: NSF Certified for Sport®
Supplement Facts
30 Servings
Serving Size: 3 Capsules
Serving Per Container: 30
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Magnesium (From 2g Magtein®Magnesium L-Threonate) 145mg | ** | |
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Daily Value (DV) not established
Always Happy Promise: Don't like a product? Tell us within 30 days of receipt and we'll make it right and make you happy. Here at The Feed, we want you to love your experience and the sports nutrition products you purchase. If, for any reason, you are not satisfied with your nutrition specific purchase, tell us.
We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
Momentous Magnesium L-Threonate FAQ's
Everything you need to know before getting started.
Magnesium L-Threonate is a specialized form of magnesium that's been clinically shown to cross the blood-brain barrier — something most other forms can't do effectively. This means it raises magnesium levels in the brain itself, supporting sleep quality, focus, and cognitive function rather than just muscle and gut health.
Magnesium regulates nervous system activity that controls your transition into deep sleep. When brain magnesium levels are low, sleep stays lighter and less restorative. Magtein® replenishes those levels, helping your nervous system calm down and promoting deeper, more consistent sleep cycles — without the sedated feeling of melatonin or sleep aids.
No, Momentous Magnesium L-Threonate doesn't contain melatonin or sedative compounds. It works by supporting your brain's natural relaxation pathways, which means you wake up feeling rested — not foggy.
Sleep improvements are often felt within the first week of consistent use. Cognitive benefits — improved focus, clearer thinking, better memory retention — typically build over 3–4 weeks as brain magnesium levels rise. Consistency matters more than any single dose.