Cytomel / T3 synthetic thyroid hormone that is widely used for fat loss in bodybuilding and other sports. Its main use in medicine is to correct sluggish thyroid function, which can result in fat gain , tiredness , hair loss, fatigue, joint and muscle pain , etc.
In sports it is used in cycles 8-16 weeks , where dose slowly increased to desired amount and slowly decreased to zero at the end of the cycle.
Typical dose 25-100 mcg a day
It is important not to stay on T3 for a very long time and taper the dose down at the end of the cycle to avoid thyroid dependency and make sure your glad still produces hormones properly.