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What exactly does Synthroid do?

What exactly does Synthroid do?
Synthroid is brand name for levothyroxine, which is commonly used to treat hypothyroidism (low thyroid levels). Synthroid and levothyroxine are human-made thyroxine (T4) hormones. They help normalize thyroid hormone levels and alleviate symptoms of hypothyroidism such as fatigue, weight gain, and depression. View original source
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