Last month I picked up some t4 for my girl while we were in playa del carmen. Now I'm not familiar with this brand and I was suspicious of 300mcg as that's an unusually high concentration, but since it was dirt cheap I grabbed a bottle anyways. She's not heating up and I tried it a bit myself and i'm not experiencing any of the usual thyroid med effects. Anyone ever used "Collins" before and been satisfied or are they just garbage.