There are usually much better choices, including a T4 type such as synthroid, or a T4/T3 type such as Armour
thyroid, or under some conditions, a T3 type such as
Cytomel,along with a T4 source.
I have no idea where that opinion that cytomel would cause heart problems and osteoporosis. That supposedly is a concern if your TSH is suppressed below the low range limit and stays there for a long while.