T3 and T4

-very similar, but T3 is 5x more stronger

-both peptides 

-regulates body metabolic rate 

-helps maintain Basal Metabolic Rate 

-Regulates digestive and brain function 

-sparks body heat production 

- assists in the maintenance of bones 

-stimulates breakdown and mobilization of fats

-stimulates activity in the nervous system

*required for normal growth and development of the body

*Produced by the follicular cells

*Iodine salts are highly need by the follicular cells