Kelp is so good for you. Rich in tons of nutrients and minerals, especially iodine, which is great for your thyroid.
I think buying real kelp from the health food store and incorporating that into your diet is much healthier than buying tablets, though I can see why supporting your thyroid could help lose weight.
Also, you should try dulse and kombu.... well, all seaweeds are great! :)
Wakame is my favorite!
I take Kelp tablets every day for my Thyroid as it is sluggish and I do notice a difference in my energy levels whist taking it. I used to eat sushi everyday and did not need to supplement, but since moving to the USA I have not had the ease of access to get sushi. Taking kelp is a worth while supplement But if you have access to fresh kelp go for it in that form.
I am not sure that Kelp can "cure" thyroid diseases. That said, I do have autoimmune thyroid problems (which is how I ended up on CC), and have re-started using iodized salt after two years I moved to the US, and sprinkle kelp granules on my meals and perhaps it is delusion but yes, I do feel more energetic since I started using it. As a matter of fact, I also chew kelp as you would do with a snack - I like it better than chips. O_o But I am also a big seafood eater, and only used iodized salt at home, and lived on the coast, so anything maritime hits home with me.