The primary cause for alarm is thyroid C-cell hyperplasia, which has been the subject of FDA boxed warnings since a research conducted on rats showing dose-dependent C-cell tumors (Madsen et al
Jia J, Li C, Zhang T, Sun J, Peng S, Xie Q, et al
It also slows down digestion in the stomach, so you feel full soon after eating
When to Hold at a Lower Dose Not everyone needs or benefits from the maximum 12mg
J Neurochem 109(Suppl 1):189197 Hassel B, Sonnewald U, Fonnum F (1995) Glial-neuronal interactions as studied by cerebral metabolism of [2-13C]acetate and [1-13C]glucose: an ex vivo 13 C NMR spectroscopic study
In most cases, if the room was cool (under 75F) and the vial was left out for only one night, it is likely still safe to use