NOW's Spirulina 1000 mg tablets are certified organic and non-GMO. These tablets have naturally occurring vitamins, minerals and GLA. This double strength product has twice the Spirulina (1,000 mg per tablet) as in our regular strength product (500 mg per tablet) USDA Organic, Non-GMO, Genuine Whole Foods, Quality GMP Assured, Vegan/Vegetarian, Soy Free GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation. Founded in 1968 by Elwood Richard, NOW is one of the largest independent, family- and employee-owned manufacturers of natural products