I felt it helped my shoulder recovery after surgery and my physical therapist commented on how quick I gained back mobility before I ever mentioned my use of it. I started the day after my surgery, using 2-3 micro doses around my surgery site twice a day. I told my therapist what I was doing and she only told me to be sure of the quality of what I was using.
I used the same needle once a day. I drew 2-3 doses at once, left some air between each dose to allow me to move it around to a few different spots around the shoulder. So 4-6 pins a day with the same needle, cleaning the site, vial, and needle between each pin. The only negative side effect was slight bruising from so many pins in the same location each day.