Adrenalin

Adrenalin was a substance produced by the adrenal gland during times of stress. (COMIC: Ripper's Curse)

It was poisonous to Blood Bugs. (COMIC: City of the Damned)

Leechers fed by draining the minerals, pheromones, and stimulants including adrenaline from their prey's kidneys and adrenal gland. (COMIC: Ripper's Curse)

The Mire fed on adrenalin and testosterone. (TV: The Girl Who Died)

The Cybermen of a parallel Earth could detect adrenalin in humanoids. During preparations for the Battle of Canary Wharf, the Cyber-Leader ordered that the Tenth Doctor be spared cyber-conversion due to an increase in adrenalin suggesting that he had vital information on the Daleks who Cybermen had been violently confronted by. (TV: Doomsday)