Doctor’s Best Brain Magnesium comes in a pack of 90 vegetarian capsules, with each serving of 3 capsules delivering 150mg of magnesium sourced exclusively from Magtein® Magnesium L-Threonate. Magtein is a patented magnesium compound developed specifically for its affinity with the brain, and it forms the entire basis of this formula — there are no fillers or additional active ingredients. The product is non-GMO, gluten free, and soy free, and the capsule shell is suitable for vegans.
Magnesium L-Threonate is the key ingredient here. Unlike standard magnesium compounds, Magtein is the form used in research focused on neuronal health and synaptic function — the connections between brain cells involved in learning, concentration, and memory. Each three-capsule serving provides 2,085mg of Magtein, yielding the 150mg elemental magnesium figure listed on the label, which represents 40% of the Nutrient Reference Value.
Doctor’s Best positions itself as a science-led supplement brand, and this product reflects that approach — a single, well-defined ingredient in a straightforward capsule format. It will appeal to those who prefer targeted, transparently labelled nutrition supplements as part of a considered daily wellness routine.





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