I started doing npp injections ed and I take sust eod. I've only done them in my quads. On the eod injections I use a 25g pin with 1 cc of sust and 1 cc of npp. On the other days when it's just npp, I use a slin pin 28g. My quads have started being on fire the past week or so. I started this new pin technique about 2 weeks ago and I feel great other than my freakn quads being sore. Even when I tale a leak, they have a weird feeling shooting down both of them. I tried a calve slin pin and that was sore enough to where I couldn't do an intense cardio session. Do you guys have someone else administer the pins in glutes, tris, delts for you or how in the hell do yall pin. I need to give my quads a break. Ive been on my current cycle now for 7 weeks on nothing but quads....OUCH!!!