Natural Factors RegenerLife Magnesium L-Threonate - Uniquely formulated for cognitive support in the aging brain. It is made with Magtein, a highly absorbable form of magnesium L-threonate, which has been shown to significantly increase magnesium concentrations in the brain. It has the unique ability to cross the blood-brain barrier, improving short- and long-term memory in individuals of all ages. It has been shown to reduce the effects of aging on the brain by nine years.