NOW Magtein Magnesium L-Threonate

NOW Foods, the manufacturer of the Magtein® Magnesium L-Threonate supplement, is a prominent American natural products company. Founded in 1968 by Elwood Richard, the brand is headquartered in Bloomingdale, Illinois. The product contains Magtein®, a patented form of magnesium specifically designed to cross the blood-brain barrier to support cognitive health; while Magtein is a trademarked ingredient owned by Magceutics, Inc., the final supplement product is manufactured and distributed by NOW Foods.

NOW is one of the largest independent, family-owned health food manufacturers in the United States. They operate state-of-the-art manufacturing facilities, primarily in Illinois and Nevada, where they perform extensive in-house laboratory testing to ensure purity and potency. The company remains under the private ownership of the Richard family, maintaining its status as a family-run business into the 2026 forecast period and beyond.