The goal of this clinical trial is to learn if Platelet-rich plasma (PRP) combined with Shock-wave therapy (SWT) works to treat moderate or mild to moderate erectile dysfunction. It will also learn about the safety of this combined therapy. The main questions it aims to answer are: * Does Combined therapy PRP + SWT improve erection in men with moderate or mild to moderate erectile dysfunction? * What medical problems do participants have when receiving Combined therapy PRP + SWT? Researchers will compare Combined therapy PRP + SWT to placebo therapy (a look-alike substance that contains no PRP) to see if Combined therapy PRP + SWT works to treat moderate or mild to moderate erectile dysfunction. Participants will: * Take a lab test to evaluate their platelets * Answer some questionnaires to assess your erectile function * Receive Combined therapy PRP + SWT (3 sessions PRP + 6 sessions SWT) or placebo therapy for 9 weeks * Visit the clinic one month, 3 months, and 6 months after finishing the treatment for checkups and tests