3'5'-Diiodo-L-thyronine (3,5-diiodothyronine) is a metabolite of the thyroid hormone. Tested only on animals, it shows the ability of the intensifying of oxidation, and thus may help to reduce body fat (weight loss). In the medical literature, there are no contraindications the use as well as side-effects in the treatment of thyroid hormone.
3,5-diiodothyronine is used in sports supplementation as a component of fat burners and pre-workout supplements.