Hello Daffers I'm sure you'll get a better reply from one of the very knowledgeable admins here, but I'm pretty certain its the latter! (No such thing as stupid questons, only stupid answers!).
We take Levothyroxine to raise T4 which converts to T3. Taking sufficient dose to raise FT4 high in range may suppress TSH but suppressing TSH isn't a target unless you are a thyCa patient. Read Treatment Options in thyroiduk.org.uk/tuk/about_...
If you have some thyroid function you are topping up your natural levels with Levothyroxine.
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