It's difficult to prove you've identified a new hormone — a chemical signal that directs behavior in distant cells, often by traveling through the bloodstream. To be sure, you need to confirm ...

The reabsorption of water back into the blood (at the medulla) is controlled by the anti-diuretic hormone (ADH). ADH is produced by the part of the brain that monitors water levels in the blood.

Hormone replacement therapy (HRT) has been linked to an increase in heart disease and blood clots in a study. Researchers ...