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  1. Thyroxine | Hormones

  2. L-Thyroxine Tablet - Uses, Side Effects, and More - WebMD

  3. Levothyroxine: Uses, Dosage, Side Effects - Drugs.com

  4. T4 (Thyroxine) Test: What It Is, Function, Purpose & Levels

  5. Thyroid Hormone: What It Is & Function - Cleveland Clinic

  6. Thyroid hormones - Wikipedia

  7. Levothyroxine: Side effects, dosage, uses, and more - Medical News Today

  8. Thyroxine | Thyroid, Metabolism, Regulation | Britannica

  9. Levothyroxine (Oral Route) Proper Use - Mayo Clinic

  10. Levothyroxine (Oral Route) - Mayo Clinic