hCG is somewhat fragile. It is typically extracted from the urine of pregnant women and then freeze dried. It is usually all clumped together prior to being mixed with water.
hCG from the pharmacy or whereever is kind of like getting raw hormone in a way, I suppose, since you mix it yourself after receiving it.
All of the hCG I have ever heard of comes in an amp or a vial, but that doesn't mean that it hasn't been packaged differently by non-pharmas.