I received my T3 today, so I'll be starting with one dose for a few days and then upping.
Side question, I frequently donate plasma as it pretty much pays my car payment (pretty worthwhile for a couple hours a week) would continuing to donate have an effect on the T3 levels in my blood or would it be miniscule? I'd hate to be wasting it. I would imagine, if it did, it would really only effect the days which donations occur.
Donating blood or plasma will have no effect on steroids, thyroid hormones or anything like that.
In fact - it will actually make the drugs MORE effective because you will have less blood in your body. The drugs will be more concentrated in your body and have a stronger effect as a result.