Magtein Magnesium L-threonate by OSAVI is an advanced supplement for cognitive optimization, specially formulated with Magtein®, a form of magnesium that effectively crosses the blood-brain barrier. This feature allows for greater accumulation of magnesium in the brain compared to other molecular forms, resulting in improved synaptic plasticity and reduced mental fatigue. The product is designed to support bodybuilders, high-intensity athletes, and e-sports users, offering benefits such as improved REM sleep, reduced competitive anxiety, and modulation of NMDA receptors. Each package contains 90 vegetable capsules, sufficient for 30 servings. It is manufactured under strict European standards by Olivit Sp. z o.o. in Poland. The supplement contains no allergens or unnecessary additives and is safe for use, provided it is kept in a cool, dry place away from direct sunlight. Individuals with specific medical conditions should consult a physician before using.