Dr. Mercola, Magnesium L-Threonate, 90 Capsules

Completely avoids magnesium stearate Magnesium stearate is not a healthy source of magnesium to help boost your supply.
Delivers a high-absorption formula Magnesium L-Threonate was selected over other forms of magnesium due to its excellent absorption characteristics.
Incorporates high-penetration characteristics Animal studies have shown how Magnesium L-Threonate uniquely crosses the blood-brain barrier and penetrates cell membranes.
Takes advantage of high-tech encapsulation and delivery system The Licaps encapsulation/delivery system provides superb leakage protection.
Helps manage potential discomfort Many forms of magnesium can cause unpleasant gastrointestinal discomfort. Magnesium L-Threonate is not a stool-softener and does not act as a laxative.
Provides practical, easy-to-take servings By taking 1g after lunch (or in the afternoon) and 1g at bedtime with plenty of water, it's quick and convenient to take.
Is delivered by a reputable high-quality manufacturer With its commitment to product innovation, the chosen manufacturer has been a trusted source for core functional ingredients since 1996.
Plus, Magnesium L-Threonate is free from any genetically engineered (GE) ingredients.

With all the options you have available in a magnesium supplement, I truly believe this is one of your best choices available.