NSF International has certified the purity of four products from Mannatech Inc. Coppell, TX. NSF evaluated the capsule and powder versions of the Ambrotose and Advanced Ambrotose supplements, which contain a patented blend of plant-sourced saccharides. The products were certified according to the NSF/ANSI 173 Dietary Supplement Standard. Mannatech is working with NSF to certify additional products in its portfolio. NSF has also certified that the company meets GMP requirements.