Calm (Natural Vitality)

Natural Vitality has been a trusted leader in magnesium supplementation since 1982, and its flagship Calm drink mix is America's #1-selling magnesium powder brand. The format is the appeal: a powder of magnesium carbonate and citric acid that combines with water to create a magnesium citrate solution, which is better absorbed than magnesium oxide. The ingredient list is refreshingly short, and the products are vegan, gluten-free, and contain no sugar, artificial flavor, or synthetic color. Natural Vitality + 3 On verification, Calm carries several independent seals: the original powder is Non-GMO Project Verified, Vegan Certified, and C.L.E.A.N. certified, and per supplement database SuppCo, the brand is backed by ISO 17025-accredited third-party testing and NSF-certified manufacturing, though product-specific testing is not currently verified. That's the honest picture: strong facility-level and non-GMO verification, but no published batch COAs or product-level NSF/USP marks like some brands in our directory. Natural Vitality also runs its own Non-GMO Assurance Process, requiring suppliers to provide exclusively non-GMO ingredients with documentation and strict separation of GMO and non-GMO ingredients. iHerb + 2 The line now spans the original citrate powder, magnesium glycinate capsules delivering 325 mg per serving, gummies, and sleep formulas with melatonin. Practical notes: the powder's flexible dosing is a plus, but it means paying attention — the suggested approach is starting with about a half-teaspoon daily and gradually increasing, since ramping up magnesium citrate too fast can have a laxative effect. Some formulas (like the sleep line) add melatonin and other actives, so read the specific label if you want magnesium only. AmazoniHerb We recommend Calm because it delivers a well-absorbed magnesium form with a genuinely short, clean ingredient list, decades of track record, and wide availability at fair prices — while being upfront that its verification story is certification-based rather than published batch testing.