Lost a good one and a half size. However, I am now having subclinical hyperthyroidism. That is, my thyroid is overactive, but I don't have most of the symthoms of hyperthyroidism. Whilst waiting to get more tests and see what is the cause, I suspect that having a kelp supplement might have not help at all.
I have now stop having it and starting a low iodine diet, until I get to be seen by a specialist.