- Sep 5, 2013
- Reaction score
T4 is the hormone derived from the thyroid gland that is the precursor to the active form of thyroid hormone T3. T3 regulates metabolism and it's this conversion that is the goal of those with hypothyroidism. T4 is present 20x greater than T3 so I am not sure why one would bother with exogenous T4. Even people with hasimoto's disease still have adequate T4 levels.
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SigRep are you running GH? I read an article a couple weeks back that said T4 should always be included with GH. Let me see if I can remember where it's from and post it up. Was a great read. Some of it went over my head but it was specific about T4 being more important than T3 to include.