E.C.
Hi M.,
I don't know this for absolute sure, but I'm pretty sure there is not one. Since the thyroid produces hormones that regulate your body and metabolism, you just need that hormone...I have had hypothyroidism since I was 6 (now almost 30) and am on synthroid for life and it works really well...I just don't think you can find that hormone in any "non-medicinal" form. I encourage you (or whoever)not to be scared of it, though, and if you are on it, stick to the brand name, not generic, form as the generic form is definitely inferior (I had problems regulating mine on generic).