From my left shoulder to the top of my left chest I have allot of veins that I can easily make out by their blue/green color. When I inject PGF2a these veins turn purple, I inject .3ml at a time, 4 injections per day. I feel very very slight PGF2a sides and honestly i proably wouldnt even notice the sides if i didn't know what they were. Does anyone know why my veins change color? My best guess is maybe a little more oxygen in the veins?