Nords are my favorite of all pharma. I get all the benefits of GH but almost none of the sides. You don't need pen needles for them either. Yellow pens are 15 iu so every ten ticks on a slin pin is 1 iu. Blues are 30 iu so every ten ticks on a slin pin is 2 iu. They always have a little extra in them too. (.5-1iu)