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Source Naturals - Magtein (Magnesium L-Threonate) 667 mg. - 180 Capsules Source Naturals Magtein (Magnesium L-Threonate) 667 mg. may provide more magnesium to the brain than other forms of magnesium. It is theorized that this is the reason why Magtein was shown in preclinical studies to support heal
