Carbocalcitonin, the amino-suberic acid analog of eel calcitonin, has all the biological properties of the corresponding natural calcitonin. The substitution of the disulfide bond of natural calcitonins with an ethylene bridge in the 1-7 N-terminal position gives elcatonin greater stability and excellent tolerability when used in vivo. MW: 3363.9 Da. Purity >98 % purified