Insulin Co-Factor Supports Healthy Glucose Metabolism Non-GMO A Dietary Supplement Vegetarian - Vegan Minerals Family Owned Since 1968 GMP Quality Assured NOW GTF Chromium is a biologically active form of chelated Chromium known as Chromium Chelavite. This form of Chromium is also known as "Glucose Tolerance Factor" (GTF) because it is most similar to the form that was originally isolated from a food source.