For Relaxation & Brain Health Magtein? Think Clearly Dietary Supplement 3rd Party Lab Tested Certified Open Source? - Full Label Disclosure U.S.A. Manufactured in a cGMP Certified Facility MagTech? has all three types of magnesium known to have the highest absorption. Research suggests that the natural compounds in MagTech? may supply more magnesium to the brain than other forms of magnesium.