I usually use slin pins, go sub-q, have done it both ways see no diff in how it works, so sub q is easier and painless. Some makers suggest IM, others sugggest sub q, so does it matter no, will you really see a diff, no, do what easiest for you with what pinz you have in stock, you'll get the effects either way.
ive been wanting to ask this for awhile cuz it was weird...but when i was on hcg my nuts were sore as fuck and my left nut was bigger than my right (yes i felt)..whats up with that shit...is that weird?