NOW Magtein® Magnesium L-Threonate – Cognitive Support, Supports Memory & Learning, Promotes Brain Health, 90 Veg Capsules

What Is NOW Magtein®?

NOW Magtein® features Magnesium L-Threonate — a patented, clinically researched form of magnesium developed by scientists at MIT specifically to cross the blood-brain barrier and raise magnesium levels in the brain. Standard magnesium supplements (glycinate, citrate, oxide) are excellent for body-wide magnesium repletion, but they have limited ability to increase magnesium concentrations in brain tissue. Magtein® changes that. By binding magnesium to L-threonate — a metabolite of Vitamin C — this unique complex is selectively transported across the blood-brain barrier, directly elevating synaptic magnesium density where it matters most: in the neurons responsible for memory, learning, and cognitive resilience. Each bottle provides a 30-day supply at the clinically studied dose.

The Science Behind Magtein®

Magnesium is the brain’s natural gatekeeper for NMDA receptors — the synaptic channels that control long-term potentiation (LTP), the cellular mechanism underlying memory formation and learning. When synaptic magnesium is insufficient, NMDA receptor regulation becomes impaired, reducing synaptic plasticity and cognitive sharpness. Magtein® has been shown in peer-reviewed studies to:

• Significantly increase brain magnesium levels compared to other magnesium forms
• Enhance synaptic density and plasticity in the hippocampus (the brain’s memory center)
• Improve working memory, short-term memory, and long-term memory in preclinical and clinical models
• Support healthy cognitive aging and mental clarity

What Does Magtein® Support?

• Memory & learning — Supports synaptic plasticity in hippocampal neurons for improved memory encoding and recall
• Brain health — Promotes healthy magnesium density in brain tissue, a key factor in long-term cognitive vitality
• Cognitive support — May improve focus, mental processing speed, and working memory
• Neuroprotection — Adequate brain magnesium supports healthy NMDA receptor function and neuronal resilience
• Sleep quality — Magnesium plays a role in regulating GABA activity, supporting restful, restorative sleep
• Stress & anxiety support — Magnesium modulates the HPA stress axis and is rapidly depleted under chronic stress

Who Should Take This?

• Individuals seeking to support memory, learning, and cognitive sharpness
• Those concerned about age-related cognitive decline
• Professionals and students with high cognitive demands
• People with low dietary magnesium intake wanting targeted brain support
• Anyone building a science-backed nootropic or brain longevity stack

How to Use

Take 3 capsules daily — 2 capsules in the morning and 1 capsule in the evening with food — or as directed by your healthcare practitioner. This matches the clinically studied dosing protocol. Allow 4–8 weeks of consistent use to experience the full cognitive benefits as brain magnesium levels gradually rise.

Product Highlights

• Magtein® Magnesium L-Threonate — patented MIT-developed form
• Crosses the blood-brain barrier to raise neuronal magnesium levels
• Supports Memory, Learning & Brain Health
• Enhances synaptic plasticity & NMDA receptor function
• Vegetarian/Vegan capsules
• 90 Veg Capsules — 30-day supply at 3 capsules/day
• Non-GMO Verified
• No artificial colors, flavors, or preservatives
• Family Owned Since 1968