Humans each carry eight pints of blood, which make up almost 10% of our body weight and perform six vital roles that keep us alive, from carrying oxygen to healing wounds. Blood repels and fascinates us in equal measure. Yet how much do we really know about this sticky, red substance, and its mysterious, life-giving force?　　Six bold experiments are performed on Michael Mosley’s blood, to reveal its astonishing properties and push it to the very limits of its abilities. From starving it of oxygen to see how it instantly responds to boost our performance, to injecting it with snake venom to witness how it can clot within seconds, human blood is revealed as never before. Using specialist photography, this programme will look at blood as never seen before, revealing the beauty in a single drop. Michael even discovers how blood tastes, when, in a television first, we prepare a black pudding with his own blood.　　The grisly history of blood-letting and transfusion will be examined and we meet one of the scientists whose pioneering work is revealing that young blood may indeed be able to turn back the biological clock and reverse the ageing process – the holy grail of modern medicine.