Provides tissue from the thyroid gland, and other glands associated with thyroid function.* Allergy Research Group® natural glandular material is derived from government-inspected, range-fed animals, raised in New Zealand and Australia, whose animal husbandry regulations are among the strictest in the world. The material is lyophilized, which means it is immediately frozen, then subjected to a high vacuum that vaporizes moisture directly from the solid state.