What is the active ingredient in Synthroid?
Synthroid
Medications
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Open Apr 01, 2026 - 10:31 AM
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Apr 01, 2026 - 10:31 AM
The active ingredient in Synthroid is levothyroxine sodium, which is a synthetic form of the thyroid hormone thyroxine (T4). This is valuable because it closely mimics the hormone naturally produced by the thyroid gland, helping to normalize metabolism, energy levels, and other important bodily processes.
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