Dietary Supplement PGX® PGX® is a unique super fiber supported by an extensive number of clinical studies. Promotes satiety and a feeling of fullness. Helps lower the glycemic index of your meals. Helps maintain healthy total cholesterol levels already within the normal range. The ISURA® seal is your assurance that this product is independently verified as clean and safe, and has been tested for over 800 possible contaminants. This product is ISURA verified clean, one of the highest testing standards in the world. Isura: Non-GMO Verified Clean.