HI 4mygood. I don't know exactly what the fillers are, but I do know that they are all natural, and that's the difference of nature-throid and armor thyroid which is made of the same ingredients, except for the fillers, which some people are allergic to, as opposed to nature-throid which has hypoallergenic fillers in it. So it is recommended because no one has to worry about getting an allergic reaction to it. I have taken it successfully for over 15 years. Another advantage of taking Nature-Throid as opposed to Synthroid, a synthetic version of thyroid medication, is that it not only contains T4, it also contains T3, T2, and T1, which helps our bodies to assimilate the T4. It's a great med, in my opinion. G
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