3rd Party Lab Tested for Purity & Quality. ½ Level Teaspoon (1.5 g) of Magnesium Citrate per Serving, 303 Servings per bottle . Non-GMO & Gluten-Free. Proudly Made in USA, GMP Compliant, FDA Registered Facility. No Artificial Color, Flavor, or Sweetener, No Preservatives, No Sugar, No Milk, No Corn, No Soy, No Egg, No Lactose, No Gluten, No Wheat, No Yeast, No Fish. Sodium Free.