Re: Anybody tried dessicated supplements?
No, they are not the same thing.
Most are made of bovine tissue, not porcine. Bovine tissue carries a risk of mad cow infection.
If the product is for sale in the United States, it does not contain active thyroid hormone, only the "leftovers" of the thyroid tissue with the hormone removed. If by some chance you find a product that manages to skirt US law, it won't be a reliably potent source of hormone. The potency will be weaker to start with and unreliably consistent bottle to bottle.
I would search for a new doctor than try to self-treat with OTC stuff.
"We can complain because rose bushes have thorns, or rejoice because thorn bushes have roses." Abraham Lincoln