GTF refers to Glucose Tolerance Factor. Chromium contributes to the maintenance of normal blood glucose levels.Zinc is a mineral essential to many body processes including the maintenance of normal cognitive function, vision, fertility and reproduction, hair, skin and nails and the immune system. Zinc also contributes to the normal metabolism of fatty acids and macronutrients. Ingredients:INGREDIENTS: one vegetarian capsule provides: Chromium (picolinate) 200ug Zinc (picolinate) 10mg Alpha lipoic acid 10mg In a base of alfalfa, spirulina & bilberry. Directions:As a food supplement, take one to three capsules daily with food, or as directed by your healthcare professional.