Any1 truly understand peptides and research chemicals?

I have done some large searches on research chems especially IGF-1.

Most of the crap on the internet is just there to sell you IGF-1 whether it be real of fake.

As i search deeper i notice there isnt just one IGF-1 there are many.

Just to name a few IGF-1 (1-3), IGF-1 (24-41), IGF-1 (30-41) (these numbers) signifying the AA possition in the sequence <-- what ever that means to us?

My question is , Is there anyone here that actually knows what this is, and what the difference is bewteen the IGF-1's ? What does it mean to the people who jab it?

Is this the reasons why some IGF-1 although they claim it is real doesnt work on humans?

Not sure about any other types personally other then lr3 IGF-1 and regular igf-1 I think everyone else sells shit just to hype it and make money and half the time they sell u the same shit with different names and that's even if ur getting real shit to begin with

Anyhow sorry I can't be of more assistance bro