Source Naturals - Magtein Magnesium L-Threonate 667 mg.Advanced Magnesium for Cognitive Health Source Naturals Magtein features magnesium L threonate, a patented form of magnesium specifically designed to cross the blood brain barrier and support cognitive function. Unlike standard magnesium supplements, Magtein has been clinically researched for its ability to enhance brain magnesium levels, making it an ideal choice for memory, learning, and overall brain health support. Key Benefits Brain Optimized
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