Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Levothyroxine (T4) | Liothyronine (T3) | |
|---|---|---|
| Category | Hormones | Hormones |
| Standard Dose | — | — |
| Timing | — | — |
| Cycle Duration | — | — |
| Evidence Level | Strong | Strong |
Synthetic thyroxine used to replace or augment thyroid hormone in hypothyroid states.
Synthetic triiodothyronine that directly raises active thyroid hormone signaling.
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