Product Description
Smarter Recovery Starts With a Mineral You're Probably Missing: Magnesium L-Threonate for Athletes
You dial in your carbs. You track your sodium. You obsess over your training zones. Here's what most athletes don't realize: the mineral that governs how deeply you sleep and how fast your nervous system bounces back from hard efforts almost never makes it to your brain in a form your body can use.
Liposomal Magtein is the brain-targeted magnesium formula built to help your nervous system recover as hard as you train.
What Makes It Different
Built to Actually Reach Your Brain
Most magnesium supplements stop at your gut. Magtein® (magnesium L-threonate) is engineered to cross the blood-brain barrier, so it goes to work where sleep, focus, and stress recovery actually happen.
Liposomal Delivery for Real Absorption
This isn't a capsule you hope dissolves. Quicksilver wraps the magnesium in a liposome — a fat-based delivery shell — so more of it survives digestion and gets where it's going.
Dual-Action Timing
One formula, two jobs: a daytime dose for mental sharpness, a nighttime dose to help your body downshift into deep sleep.
The Science Made Simple
Magnesium fires your muscles, but it also runs your nervous system — and most forms never make it past your gut to your brain. Magtein is different: it's a patented form of magnesium built to cross the blood-brain barrier, where it supports memory, focus, and how well your brain signals "stand down" after a hard session. It's paired with phosphatidylcholine, a fat that makes up the walls of your brain cells and helps keep those signals firing cleanly.
How to Use It
Take daily: 5mL in the daytime for mental clarity, 10mL an hour before bed for sleep support.
Hold it: Keep the liquid in your mouth for 30-90 seconds before swallowing for better absorption.
Pro tip: Stay consistent — brain magnesium levels build over days, not doses.
UCLA researchers are currently running a placebo-controlled trial on collegiate athletes, tracking how magnesium L-threonate affects sleep depth and heart rate variability using WHOOP straps — the same recovery metrics serious endurance athletes chase every night.
Stop settling for magnesium that never makes it past your stomach. Get the form built to reach where recovery actually starts.
- Gluten free
- Vegan
Supplement Facts
30 Servings
Serving Size: 15 mL
Serving Per Container: 30
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Magnesium (elemental) (from 1000 mg Magnesium L-threonate as Magtein®) 72mg | ** | |
| Phosphatidylcholine (from highly purified phospholipids) 450mg | ** | |
* 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
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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.
Quicksilver Scientific Liposomal Magtein® FAQ's
Everything you need to know before getting started.
Take 5mL during the day for mental clarity, then 10mL about an hour before bed to support sleep. Hold each dose in your mouth for 30-90 seconds before swallowing.
Most magnesium forms (citrate, oxide, glycinate) stay in the gut and muscles. Magtein (magnesium L-threonate) is built to cross the blood-brain barrier, targeting the nervous system directly.
Magtein is a patented form of magnesium L-threonate developed from MIT research, designed specifically to raise magnesium levels in the brain rather than just the bloodstream.
Both — that's why it's dosed twice. The daytime dose supports mental sharpness; the nighttime dose is timed to support deep sleep.
Brain magnesium levels build gradually. Most users take it consistently for several weeks before noticing changes in sleep and recovery.