Rabbit,
If I remember right it was just kelp. Knowing DH it was probably once a day, but check the bottle for recommendations. I will ask DH the details. We are vegetarians and at the time DH was nearly vegan. We always eat a very healthy diet and have eaten this way for all of our adult lives - and we are old. We eat organic as much as possible and grow as much of our food as we can. Whole grains, vegetables and fruit, beans, DH does not eat dairy as it does not agree with him.
DH is very thin, very sensitive to cold, and yet his test shows hypothyroid. Also, the numbers for hypothyroid/hyperthyroid have changed in recent years. At the risk of sounding paranoid (I do NOT trust drug companies!) I wonder if they changed to increase sales of Synthroid et al? It seems that everyone is being diagnosed with a thyroid issue.
Babs, we bought it at our local health food store. Sorry I can't do better than that for you. If you talk to the people at a health food store they can probably help you find that information.