I think this maybe it applies to those who have high blood pressure, high LDL levels and just coming off of a testosterone cycle, which increases your RBC count, which can cause clots. Many people choose to donate blood to thin the blood out. .02
I used to shoot my quads and I would alternate, I stopped doing it there cause I work construction and I couldn't walk the next day. I used. 25gx1.50 I'm kinda fat so that's why I chose 1.5. Lol. You should kinda run or massage your leg afterwards. .02