COMPENDIUM ON FUNCTIONAL MEDICINE - Flipbook - Page 166
● Exercise: Acute intense exercise can transiently alter thyroid
hormone levels
Medications and Supplements
Numerous medications can alter thyroid function tests, including:
Glucocorticoids
Suppress TSH and peripheral conversion of T4 to T3
Amiodarone
Contains iodine, may cause either hypo- or hyperthyroidism
Estrogens
Increase TBG, raising total but not free thyroid hormones
Beta-blockers
Reduce peripheral conversion of T4 to T3
Biotin
Common supplement causing laboratory interference in thyroid
assays
Nutritional Status
Iodine
Both deficiency and excess can alter thyroid function
Selenium
Essential for deiodinase function and thyroid hormone metabolism
Iron
Deficiency impairs thyroid peroxidase activity
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