Advanced Formula 2,000 mg Magnesium L-Threonate Quality Matters Supports Cognitive Health Certified Nutrition Nsf Certified Gluten-Free Non-gmo Project Verified Dietary Supplement Third Party Tested cGMP Compliant Magnesium L-threonate is the salt formed from chelating magnesium and threonic acid, a water-soluble substance derived from the metabolic breakdown of vitamin C. Easily absorbed, these magnesium L-threonate capsules are designed to support overall brain health including memory, focus, cognition, mood, and even sleep. Magnesium L-Threonate has been shown to cross the blood- brain barrier unlike other magnesium forms like glycinate, citrate, or oxide.