Thyroxine, or T4, is the principal hormone produced by the thyroid gland. Pharmaceutical T4 replacement products commonly contain synthetic levothyroxine sodium and are used to treat hypothyroidism.

The Xeno Labs listing identifies the product as T4 but does not provide sufficient verified information to establish the exact active ingredient, strength, dosage form, or package size. Those details should come directly from the product label.

Thyroid hormone therapy requires individualized treatment and monitoring of thyroid function. GORoids should verify the exact formulation, manufacturer documentation, storage requirements, warnings, and regulatory status before publication.