I truly believe people will have their own preference on when and how much to inject. Then they will try to come up with reasons (or studies, or Bro-science, etc.) to back their decision. I was guilty of the same thing when I began using HGH years ago. After spending over $400 dollars for 3 kits, I wanted to take the least amount I could get away with to make it last. I settled on 4iu's per day. As I mentioned previously, my coach at the time was Alex Azarian (RIP), who advised me to raise my dose to 6iu's per day for maximum results.
I was listening to a Podcast recently over on Advices Radio called Blood, Sweat & Gear. It features Scott McNally, Skip Hill and someone who calls himself S2H (apparently his handle on a number of forums). It was another of those discussions about timing of HGH injections. S2H mentioned a number of times that he preferred EOD (every other day) injections. Aside from his feeling that it would help avoid the potential side effects of HGH, his argument was "I don't know, I just think it just works better for me". So.....
My opinion is this. I do not ever remember seeing any package inserts for Pharma HGH advising people to inject EOD. I have not heard of one instance where a Dr. prescribing HGH to a patient has recommended EOD injections. So, where do these things come from?
I usually subscribe to the "Just Get It In Ya" theory. Whether you are talking about AAS, food, even training. Just Do IT! Do you really believe you will get more of a benefit injecting Test E right before training? (of course, maybe you will if we were talking TNE, but that is a different discussion.) As far as HGH is concerned, I'm not sure if it is true. I can be open to the possibility that injecting 2iu's an hour before training and 2iu's an hour after training may yield some benefit. Adding your 2iu's first thing in the morning pre-cardio, now we may be on to something. I believe the half-life of HGH is 4 hours. So, would that make it reasonable to inject 2iu's every 4 hours? Or is it more realistic to inject the entire 12iu's once per day to mimic the bodies natural pulse? See where I'm going with this?
At the end of the day, people will choose what they want to believe, then they will find reasons for their decisions!