Source Naturals Magtein® 90 Capsule

Not all magnesium reaches the brain. Most forms stop at the bloodstream, unable to cross the blood-brain barrier that protects our most precious organ from intruders. Magnesium L-threonate was designed specifically to pass through.

Magtein is that magnesium.

Developed by scientists at MIT, this unique formulation emerged from research into how magnesium supports synaptic plasticity—the brain's ability to form and strengthen connections. Preclinical studies suggest it raises magnesium levels in the cerebrospinal fluid, where it can influence the architecture of memory and learning.

The implications ripple outward. Better recall. Clearer thinking. The sense that your mind is working with you rather than against you. Many report dreams becoming more vivid, which some researchers interpret as evidence of deeper, more restorative sleep.

Each capsule contains 667mg of Magtein® complex, yielding 48mg of elemental magnesium. The dose is modest by design—this form is about reaching the brain, not flooding the body.

Take three capsules daily: two in the morning, one at night. Or adjust to your own rhythm. Some notice effects within days; others find the benefits accumulate over weeks.

The brain is not fixed. It is constantly remodeling itself. Magtein provides the raw material for that renovation.

What will you build