Calcitonin- 13 C 6 , 15 N 4 (salmon) (Salmon calcitonin- 13 C 6 , 15 N 4 ) TFA is 13 C and 15 N-labeled Calcitonin (salmon). Calcitonin (salmon) , a calcium regulating hormone, is a dual-action amylin and calcitonin receptor agonist, could stimulate bone formation and inhibit bone resorption.