What about the human grade? Sorry I just don't know the differences. 1 web sight with 3 different types of the same thing is confusing to me.
human grade gear means gear by manufacturers who are regulated and licensed to make the gear legally for human use, etc.
companies like upjohn, schering, bayer, etc. etc. etc.
because the manufacturing process is regulated, it is generally believed that you will get the cleanest, highest quality and properly dosed gear going this route.
the only problem, they are faked.... ALL THE TIME. sometimes they are counterfeit packaging with whoever is counterfeiting them also making gear with the right hormones and putting them in there.
a recent example of this was 3 items z was selling which turned out to be counterfeits, or "replicas" like the fake sports jerseys you can buy online. whether all of his other hg stuff is the real deal hg stuff or is also replicas that haven't been exposed yet, i do not know. but everyone still gives them very solid reviews either way.
the international is shipped out of one particular location outside of the US. cheaper, but it has to go through customs, so you risk having your gear confiscated.
the domestic is a bit more expensive because it will ship from within the USA so you don't have to worry about any customs issues.
all in all, it is hormones in a bottle. different ways to skin a cat. choose one and try it out. don't spend more than you can afford to lose though just in case.