Foundations · 5 min read
Hormone Conversion: T4 to T3 Explained Simply
Your thyroid mostly makes inactive T4. The magic — and the bottlenecks — happen when your body converts it into active T3.
Your thyroid makes mostly T4 (thyroxine), which is the inactive form of hormone. Your body must convert T4 into T3 (triiodothyronine) — the active form your cells actually use.
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