Just a question to help the convo. T3

have any of you ever heard of taking 12.5 mcg of T3 ed to help aid in protien synthesis. I was under the impression that this did not affect the thyroid, b/c the thyriod produces double that in the body ED, so the thyriod funuctions won't shut down if you take this small of a dose, plus your body will utilize more protien, making you bigger. Any thoughts from some people with knowledge of T3? I am not a T3 user thats why I honestly don't know and have often wondered.