Book excerpt: This definitive volume will provide the reader with up to date information and the most recent science of the fast-evolving area of nanobiotherapeutic-based blood substitutes. Long studied, there are recent updates that make their use in patients more promising, and with one product approved for human use, many more in the pipeline. These include 2nd generations and even third generation ones, the later with enhancement of red blood cell functions. In addition, there are carefully written and referenced updates on the recent history and products in the field, complete with pathophysiologic and pharmacologic studies to validate and verify the efficacy and safety of many of these new products.