Zip Code 23803 Population. 23803 is located in the state of Virginia in the Richmond metro area. Zip code 23803 is primarily located in Chesterfield County. Portions of 23803 are also located in Dinwiddie County.The official postal service name used for 23803 is PETERSBURG, Virginia.ip Code 23803 Area Codes. 23803 is located in the state of Virginia in the Richmond metro area. Zip code 23803 is primarily located in Chesterfield County. Portions of 23803 are also located in Dinwiddie County.
Cytomel (T3) is rarely prescribed on its own to address thyroid problems; it is usually prescribed with T4. In the past, cytomel was a scheduled treatment for obesity; however, an increase in heart complications and cardiac stress forced withdrawal of T3 for that application.
T3 & T4. The thyroid gland is responsible for regulating body metabolism through its production of thyroxine (T4) and triiodothyronine (T3) tyrosine-based hormones. You may have heard about the T3 and T4 hormones before, but may not realize its importance in your body. The T3 and T4 hormones are produced by the thyroid gland, and are secreted into the blood stream to regulate the body's metabolism. Functions of T3 and T4. These hormones are essential to the growth of the body. The T3 and T4 hormones act on almost every cell, increasing the metabolic rate, affecting protein synthesis and regulating bone growth.