Product name : Magnesium L-Threonate Synonyms: L-Threonic acid Magnesium salt, MgT CAS Number : 778571-57-6 Appearance: Off-White to white powder Magnesium L-Threonate (MgT) boosts magnesium levels in the brain, which helps neurons maintain a state of healthy sustained activity, neither over-stimulated nor under-stimulated. scientists believe, by maintaining this healthy homeostasis, the brain can more easily respond to mental demands and perform cognitive tasks with less stress and fatigue.