Cabot Health Thyroid Health 120 Caps. The thyroid is a vitally important organ responsible for regulating metabolism, growth and development, body temperature and heart rate. The thyroid controls the rate at which food calories are burned. Maintaining a healthy thyroid gland could assist in weight maintenance and energy production. Thyroid Health Capsules can safely be taken with thyroid hormone replacement if needed. The thyroid gland holds more selenium than any other organ in the body. Selenium is used to produce selenoproteins-antioxidant enzymes needed for adequate thyroid function. Selenium is required for the production of thyroid hormones and the conversion of inactive thyroid hormone-T4, into its active form-T3 to be utilised in the body. T3 hormone is 10 times more active than T4. Iodine is required for the production of T3 and T4 thyroid hormones. A deficiency of iodine may inhibit the production of these thyroid hormones and could affect thyroid function. Vitamin D plays a significant role in regulating and strengthening the immune system. Vitamin D works well with parathyroid hormones to support healthy blood calcium levels and strong bones.