They are putting in their own IV at the gym? 
They do it like any junkie with a syringe. A few years ago there was a trend out of California iirc of putting GH in the veins too but it turned out to be a bust and not worth it, besides, the body clears the GH in minutes anyway. But now that I think of it, surely they put a little GH in along with the insulin, as long as you are puncturing a vein. Someone said they put in carnitine with the shot.
I saw Milos' written diary of his carb loading protocol and if I remember correctly it was 10iu of Lantus once and then 8iu of Humalog with every other meal. Now some pros are taking at least 10 times more Lantus and at least another 100iu of Humalog.
I don't think doing something IV crosses any lines for me, but from what some say just the puncturing of the vein numerous times is problematic from a health standpoint.
I'm talking mostly Milos insulin "routine" right before a show along with filling up with carbs.
Because I thought it was mostly how much fuller he was 2nd day. and might be from doing that. But maybe it was just a timing issue.
refering to
They have said using insulin while loading you can see yourself inflate in front of a mirror. While it does help I don't think insulin works that dramatically for most.
That story is utter baloney, going from looking like he weighed 190lbs to 250lbs in a matter of minutes lol. White as a ghost I believe, that can be viaually dramatic.
But sure, high likelihood he did take insulin, first with the, I assume, the 3 day carb load and maybe after predjudging. But it could also be that he was most dehydrated predjudging and then didn't take more diuretics and rehydrated some.