Nutricost's Magnesium L-Threonate capsules is made with Magtein and contains 120 vegetarian capsules with 2,000mg per capsule. Each bottle contains 40 servings (3 capsules per serving), so 1 bottle can last around 1 month if taken according to recommended dosage. This supplement is gluten free, non-GMO, and vegetarian friendly. All Nutricost products are manufactured in GMP complaint, FDA registered facilities and each batch of every product is tested by independent, ISO-accredited laboratories to insure safety and quality.