BioTime helps surgeons face down a long day in surgery. BioTime makes water-based solutions to prevent massive blood loss after traumatic injury, preserve organs for transplant, and replace blood during such procedures as cardiac bypass. BioTime's Hextend product is approved to maintain blood volume during surgery and is sold in the US and overseas via third parties. The firm is also developing PentaLyte, a version of the blood volume replacement product that metabolizes more quickly. BioTime has also expanded into the field of regenerative medicine; it sells a line of therapeutic stem cell research supplies. It is also working to develop its own line of biotech therapeutic candidates for degenerative diseases.