<i>The study involved autopsies of eight people who had received injections of human growth hormone as children more than 30 years ago. The growth hormone, extracted from human pituitary glands, had been tainted with a protein that caused these people to develop a fatal brain disease called Creutzfeldt-Jakob disease.</i><p>A very high % of NFL players currently take HGH or have taken HGH for a significant amount of time.  Brain health is a constant topic of conversation for the NFL, I wonder if transmitting brain disease through brain tissue injections is something they need to look at outside of concussions.