Supplements that contain thyroid glandulars from an animal source. Thyroid glandulars support thyroid function by providing the body and thyroid gland with portions of animal thyroid gland. Thyroid glandular contain enzymes, pro-hormones, and proteins found in the animal gland which are then picked up and used by the body providing thyroid support for the patient. They are among the strongest over the counter ingredients thyroid patients can use for thyroid support.