Very bad get radioiodine treatment instead. It’s the cure!
If you put your cat on this food please note it has very little quality for the cat. Cats need high protein. If they eat a treat with this it counteracts it. The turnour that causes hyperthyroidism eats iodine. The cure is i131 radioactive iodine, it’s a simple injection in the scruff like a booster & doesn’t make them feel poorly. Lots of vets arent up to date with protocol. I’ve had 2 of my cats cured at the hyperthyroid cat Centre in Wetherby, it’s amazing.