Supports Healthy Thyroid Function Supports Healthy Metabolism NOW Thyroid Energy is a complete nutritional supplement for the support of a healthy thyroid gland. NOW has combined Iodine and Tyrosine, the two constituents necessary for the synthesis of thyroid secretions. The minerals Selenium, Zinc and Copper have been added as cofactors needed for normal thyroid function. In addition, NOW Thyroid Energy has the Ayurvedic herbal extracts from Guggul and Ashwagandha to complement its nutritional support components.Natural colour variation may occur in this product.