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Source Naturals Magtein Magnesium L- Theronate 90 cap. Phosphatidylserine (PS) is one ofThe Brain Optimized Magnesium Source Naturals Magtein features magnesium L threonate, a breakthrough form of magnesium specifically designed to support cognitive function, memory, and brain health. Unlike other forms of magnesium, Magtein has been shown in research to effectively cross the blood brain barrier, elevating magnesium levels in the brain to support synaptic density, neuroplasticity, and overall cognitive performance. Breakthrough Research