a friend of mine ages ago had that, he takes (for what i know, the rest of his life??) either T3 or T4 - cant remember - and yes, it was obvious he was lacking in something for the benifits he gained once starting the HRT was almost like night and day.
Mind you, his performances never got above average, but for him, average was much better than plain old suck…
I wish i worked with a Dr - im sure some of my clients have Thyroid issues - they diet, they train but results are very very slow. Maybe 5% of clients?