Our expert says:
Eltroxin is synthetic T4 hormone.
Tertroxin is a synthetic form of T3 that was approved by the FDA in 1954. It is preferred over Eltroxin (synthetic T4) by many doctors because it does not require conversion in the body (T4 must be converted to T3, the metabolically active form).
The thyroid gland secretes two significant hormones: thyroxine (T4) and triiodothyronine (T3). Approximately 93% of the hormone secreted by the thyroid is T4, with only 7% being T3.
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