Magnesium is critical for optimal brain function as well as over 300 other metabolic processes in the body. High hemoglobin A1c reflects poor glucose control that is affected by low magnesium levels and a primary cause of cognitive decline. Transdermal magnesium (Keyano Elements Spray) is very effective in elevating magnesium levels in the body without causing digestive distress. Magnesium is also required for the conversion of Vitamin D3 to its active form.