Thyroid hormones, including T3, have been used for medical purposes since nineteenth Century 90s。 T3 thyroid hormones are extracted from animals and contain pure T3 and T4 hormones, which are highly beneficial in the medical field, especially in the treatment of hypothyroidism. Hypothyroidism is the inability of the thyroid gland to produce enough thyroid hormone to cause weight gain, energy loss, hair loss, and changes in skin texture.
T3 is not the only synthetic thyroid hormone in the market. T3 and T4 are very similar, but T3 is four to five times stronger than T4, so T3 is more popular. Both can be used for the treatment of hypothyroidism, athletes generally use the T3 to lose fat.