Bio-ether

Bio-Ether is a special kind of serum invented by Scott Seeker as a kind of remedial relief for injuries. Each injection of Bio-ether directly installs tiny machines into your blood stream that seek out injuries and repair your muscular structure from the inside out. The machines themselves are tiny enough to travel anywhere through your system, repairing cell structures as they go, before being absorbed and broken down into your blood stream after 10 minutes.
Although there is skepticism surrounding the safety of such machines entering patients' bodies, the Serum's effectiveness allays this opposition outright. Further research on the topic will surely follow in years to come, but since the Abundance Army approved this product for military use, most vocal opposition has simply ceased.