Eun Lee, MD If your healthcare provider has ordered a T4 test, you may wonder what it is. Thyroxine is another name for T4, ...

Alternatively, in the case of highly bound hormones, such as thyroxine, the Law of Mass Action can be used to calculate the free hormone concentration. [194] The total hormone concentration ...

However, I have not been able to find any evidence in the scientific literature that St John's Wort cannot be taken alongside thyroxine. This makes perfect sense when you consider that thyroxine ...