What produces oxytocin and vasopressin?

Pituitary and adrena: The posterior pituitary gland makes oxytocin, and a layer of the adrenal gland makes vasopressin(epinephrine).

BOTH=Post. Pituitary: Both oxytocin and vasopressin (adh) are produced in the posterior pituitary the structure of oxytocin is very similar to that of vasopressin also a nonapeptide with a sulfur bridge, whose sequence differs from oxytocin by 2 amino acids.

The pituitary gland.: These hormones are chemically very similar, yet functionally distinct.