@nycmusic
Most of the concern was with higher TSH levels.
But....
There is at least one study of around 450 people with 81 euthyroid levothyroxine users done at John Hopkins.
The conclusion was this: “Our study suggests that even when following current guidelines, levothyroxine use appears to be associated with greater bone loss in older adults,” said Shadpour Demehri, M.D., co-senior author and professor of radiology at Johns Hopkins.
It seems there was more concern in older adults. (what else is new, ha)
https://www.rsna.org/media/press/i/2538
Interestingly, this study seems to be even more nuanced in that this research had a particular profile: 70 and older, T4 only no T3, normal tsh but free t4 was often high, normal free t3 was low normal, already declining bone density, taking no BHRT or HRT, no strontium therapy.
This profile was extracted by copilot from numerous different sources. If you want a list just put the question into copilot, and it will list them for you.

Whatever the situation it seems conservative for those of us on thyroid hormone to watch our bone health carefully and to observe best practices.