. I'm not sure why ZIP! is messing you up though I'd suggest starting slow -- just as you would using thrypoid meds, though ZIP enhances natural thyroid output while meds (and some prohormones) suppress it. Sometimes it takes a little while to get "settled in."
You have to be careful with thyroid supps. Some ingredients I've seen are just names for other things. For example , Rauwolsine is another term for Yohimbe. It has nothing to do with the thyroid but it does give energy.
Other "diones" are suppressive in effective dosages, though that shouldn't be too much of a worry since they're inert when taken orally as is the case with 3,3 metabolites of T2.
If you want T2, you might want to look into getting Armour thyroid, which is a thyroid med made form thyroid extract. (ZIP contains some desicatted thyroid). T2 alone though doesn't burn much fat. You need T4 and T3 (which is converted from T4). Both ZIP and T3PCT have ingredients that do this.
I know it's a lot of info. But I believe it's best for people to make an informed decision about this stuff. Look at all the options and decide from an educated standpoint, as opposed to theories and promo.