The body uses the minerals Iodine and Selenium to make thyroid hormones, which are essential for heat, energy and metabolism. This formula provides Iodine and Selenium, plus Tyrosine and nine other vitamins and minerals. Provides key nutrients for healthy functioning of the thyroid gland Tyrosine, together with iodine and selenium are needed to make thyroid hormones Healthy thyroid function is important for virtually all body systems especially energy and metabolism. Take alongside Ocean Kelp for additional thyroid support (not if taking thyroxine) One capsule typically provides 12.5mg Vitamin C, 15mgNE Niacin, 3.3mg Vitamin B6, 60µg Folic acid, 5µg Vitamin B12, 1.25mg Iron, 25mg Magnesium, 2.5mg Zinc, 30µg Iodine, 1.25mg Manganese, 250µg Copper, 30µg Selenium, 450mg Tyrosine. Please note May not be suitable for people with a fish or crustacean allergy. If also taking thyroxine, do not take more than one capsule a day (or more than a total of 30µg Iodine a day). Not advisable if pregnant or in cases of melanoma, schizophrenia, high blood pressure or if taking MAO inhibitors.