It is never a good idea to use thyroid medicines without a proper prescription based on due blood work and diagnosis, since this gland is very easy to mess up, and that may have many consequences for your health.
There are much safer and more effective alterantives, such as the combination of Cardarine GW and N2SLin. My wife has used this stack several times - the results were great, and she did not have even minor issues, so I can personally vouch for these compounds.