Researchers Say Supplements Contain 'Significant' Amounts of Thyroid Hormone Nine out of 10 "thyroid support" pills tested by Mayo Clinic researchers contain "risky" levels of thyroid hormones. A wide range of supplements that claim to support or improve thyroid function are available online and in retail stores. Some list only herbs as ingredients. Others are capsules filled with dried, ground-up thyroid gland from pigs or cows. People take the supplements because they may feel tired, or for unexplained weight gain -- symptoms they interpret as a sign their bodies are making too little thyroid hormone. When a number of his patients told him they were taking the supplements, endocrinologist Victor Bernet, MD, of the Mayo Clinic, Jacksonville, Fla., became curious. Might they contain the same thyroid hormone as Levothroid, Levoxyl, Synthroid, Unithroid and other prescription drugs used to treat thyroid hormone deficiency? Yes, Bernet says
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