Brain-Mag (magnesium L-threonate) is the only form of magnesium shown in multiple studies to cross the blood–brain barrier and significantly raise brain magnesium concentrations. This is its key distinguishing factor for targeted brain health. Other forms like magnesium glycinate and malate are highly bioavailable for general body magnesium levels, and glycinate is often cited for its calming effects. However, magnesium L-threonate is specifically formulated and studied for its ability to elevate magnesium levels within the brain for cognitive benefits, which other forms generally do not achieve as effectively.