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. Chromium Chelavite® is a superior type of chromium-niacin amino acid chelate from Albion Laboratories Inc. with GTF (Glucose Tolerance Factor).