Thyroid hormones can help depression...

[LittleJem]

Major Depression: Adding Liothyronine Increases Response to SSRI

Response to SSRIs, the most frequently used first-line agents for major depression, tends to be slow, and full remission is obtained by fewer than half of treated patients.

www.psychiatrictimes.com

There is more research out there - this is just one paper I just found once I read someone on Reddit talking about this...
Here's one good review I found - there are a few good reviews out there:

Rated for Bipolar I disorderReport​

Can't be without it. Cytomel treats my depression better than any other drug. Period.
You can find more reviews here: https://www.everydayhealth.com/drugs/cytomel/reviews/2

And probably in other places too :)

 

[Sinkinshyp]

I was diagnosed with the worst case of thyroid cancer my specialized medical team had ever seen at 18. Yes thyroid can cause many issues with mental health. Depression, anxiety, insomnia, mania and more. Usually if depressed you would need some thyroid hormone replacement. Great article thank you so much for sharing hun