Thyroid hormones are produced by thyroid glands. T3 and T4 are thyroid hormones that are made up of iodine and tyrosine. Less intake of iodine results in less production of T3 and T4 which may lead to a medical condition called hypothyroidism. Greater production of thyroid hormones leads to hyperthyroidism.
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- "1926 Edward C Kendall". American Society for Biochemistry and Molecular Biology. Retrieved 2011-07-04.
- Irizarry, Lisandro (23 April 2014). "Thyroid Hormone Toxicity". Medscape. WedMD LLC. Retrieved 2 May 2014.