Basically I've been having shoulder pain/impingements from workouts since 2018. I stopped working out for 7 months with no results. By watching some yt videos on how to diagnose different types of shoulder problem, I concluded the pain was coming from the supraspinatus tendon I've heard several people who had good results from PRP for shoulder injuries and I realized that it wouldn't be complicated for a homebrewer to prepare PRP at home and administer it myself so I gave it a shot. It was the messiest experiment I done thus far. My room basically looked like a crime scene after the preparation. There were bloods everywhere. It was a bit complicated when it came to injecting the PRP as you have to be very precise in order to inject the right tendon. Anyway, 2 weeks after I did PRP injection, my left shoulder is 80% better, my right shoulder is 50-60% better. I'll probably do another round of PRP or try bcp and TP to get rid of the rest of the pain. The most expensive part of this experiment is the centrifuge which cost me $300 from Amazon.