Quick view NOW Foods Magtein, Magnesium L-Threonate - 90 Vege Capsules MSRP: $85.66 Now: $61.91 Was: What isĀ Magtein?Magnesium (Mg) is an essential mineral best known for its role in bone and nervous system function.* Recent research has demonstrated that it is also critical for normal brain... MSRP: $85.66 Now: $61.91 Was: Add to Cart Quick view Add to Cart