If you have thyroid disease, are taking other medication, or have experienced iodine deficiency over many years, you should speak to your GP before taking additional iodine.
It is important to note that kelp and seaweed supplements should NOT be taken as an iodine source, particularly by pregnant women.
Unfortunately, in the UK it is not possible to buy iodine as a single supplement. Iodine is frequently sold as kelp supplements (e.g. in health-food shops). However, kelp and seaweed supplements are highly variable – the actual amount of iodine in the supplement may not be the same as that stated on the label. It is possible that kelp and seaweed supplements may lead to excessive iodine intake.
Text written by Dr Sarah Bath (August 2015)