Iodine is a elemental anion that is rarely found in the agrarian diet. The only function iodine preforms in the human body is found in the thyroid gland. The thyroid gland stores iodine for future use in the form of hormones.

Thyroid hormones can be rapidly depleted by artificial stimulus, such as psychotropic medications. Thyroid deficiency can result in decreased metabolism, increased weight gain, increased prolactin.

From a health standpoint: when all else fails, the thyroid gland can often pull you through just about anything. But it needs enough iodine to do it.

When considering iodine supplements it is important to find one that has a sustained release. This is usually in the form of kelp. Kelp expands when it is dehydrated so just eating some kelp is not recommended -- although it is where the iodine is (beware). You can cook with it.

Free iodine, such as found in salt, can be thyroid stimulating at very low amounts. It only lasts a hour or so however. This is not enough.

It is difficult to meter iodine into the system. When I was in highschool I took supplements and could only eat one half a tablet each morning. Just feeling the burn in the afternoon and not getting sick is what you are looking for. If you don't want the burn, turn it down a notch -- but don't forget to take you iodine.