Source Naturals Magnesium Glycinate plays a key role in over 300 enzymatic reactions, including supporting cardiovascular, bone, muscle, energy, and neurotransmitter processes.* Suggested Use: Take 2 tablets twice daily. Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, preservatives, or artificial color, flavor or fragrance. Trusted for over 40 years. Source Naturals was created in 1982 by CEO Ira Goldberg to support each individual's potential to enjoy optimal health. Manufactured in the USA. Manufactured in Scotts Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration (FDA).