Which hormone works directly in the intestine to increase plasma calcium levels? hints which hormone works directly in the intestine to increase plasma calcium levels? calcitriol calcitonin parathyroid hormone (pth) ?

Calcitriol, aka vitamin D (di-hydroxy, cholecalciferol), works as a hormone directly in the intestine to increase plasma calcium levels.

**It also works as a hormone directly on the kidneys as well, to prevent calcium loss in the urine.