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Is Thyroxine T4 or T3?

Maya Lin-Takahashi • • 6 min read
Is Thyroxine T4 or T3?
★ Key Takeaways

The Major Thyroid Hormone Secreted by the Thyroid Gland Is Thyroxine, Also Called T4 Because It Contains Four Iodine Atoms. to Exert Its Effects, T4 Is Converted to Triiodothyronine (T3) by the Removal of an Iodine Atom. This Occurs Mainly in the Liver and in Certain Tissues Where T3 Acts, Such as in the Brain.

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Direct Answer • Key Takeaway

The Major Thyroid Hormone Secreted by the Thyroid Gland Is Thyroxine, Also Called T4 Because It Contains Four Iodine Atoms. to Exert Its Effects, T4 Is Converted to Triiodothyronine (T3) by the Removal of an Iodine Atom. This Occurs Mainly in the Liver and in Certain Tissues Where T3 Acts, Such as in the Brain.

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Maya Lin-Takahashi
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Maya Lin-Takahashi

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.