In a world where blood transfusions are essential for keeping people alive when they are seriously injured and losing blood, it’s worrisome that the US is expected to see a shortfall of around 4 million units of blood annually. Fortunately, researchers have come up with a bio-synthetic substance that can act as an oxygen carrier in place of blood during emergencies. According to the researchers, the blood substitute can prolong your life 24 to 48 hours longer, hopefully enough time to get transported to a medical facility to get a blood transfusion.