HCG, Intramuscular Use Only?!

Can someone please enlighten me as to why my HCG says “instramuscular use only” I prefer to shoot it sub Q shall I ignore what it says or what?

Just use it sub-q. No reason to go IM.

It can be done both ways… sub is more common even with indications for intramuscular. The difference is in absorption, peak and output time. With sub is slower.