What do the c cells of a thyroid gland produce

Calcitonin is a hormone produced by the c cells of the Thyroid gland.

Explanation:

The c cells present in the thyroid are otherwise called Parafollicular cells. The primary function of c cells is to secrete Calcitonin (a protein hormone) which has a minor role in calcium regulation. Calcitonin decreases the parathyroid hormone (PTH), by lowering blood calcium level by suppressing osteoclast activity of bones and increases of calcium Which is excreted along with the urine. The C cells are found next to the Thyroid follicles and present in the connective tissue.