Whole food, nutrient dense grass-fed & grass-finished desiccated beef thyroid supplement. Unlike Armour, Naturethroid, Westhroid-P and NP Thyroid which are concentrated USP thyroid extracts derived from porcine (pig). Pasture raised in new Zealand & Australia. Hormone, pesticide & GMO Free. No fillers, 100% freeze dried & non-defatted. Third party tested for purity. Allergen free. Should be taken ONLY with proper thyroid testing and practitioner guidance.