Each Brain-Mag capsule delivers 500 mg of pure magnesium L-threonate. Information from reputable sources indicates that magnesium L-threonate (specifically Magtein, which Brain-Mag uses) contains about 75 mg of elemental magnesium per gram of magnesium L-threonate. Therefore, one 500 mg capsule of Brain-Mag provides approximately 37.5 mg of elemental magnesium (0.5 grams \* 75 mg/gram).
If taking prescription medication, take Brain-Mag at least two hours apart to avoid absorption interference (especially with certain antibiotics or bisphosphonates). Given the low elemental magnesium content per capsule and the potential for exceeding the tolerable upper intake level (UL) for magnesium from various sources, it is highly recommended to consult a healthcare provider before combining Brain-Mag with other magnesium supplements or multivitamins to avoid excessive intake and potential interactions. The general Recommended Dietary Allowance (RDA) for elemental magnesium in adults is 310-420 mg per day.