The body attempts to closely regulate the free hormone concentration in the blood through a variety of factors, including binding of free hormones in the blood by albumin. This causes inhibition of additional hormone release and increased degradation of existing hormone when levels are too high. For example, triiodothyronine (T3) is able to prevent additional release of T3 from the thyroid when its levels are too high.
What kind of feedback mechanism does T3 employ?