Sure, though you still have to limit IGF-1 to under Z score 3 or face the risks that presents. You could likely max out safe IGF and not experience any sides, which is cool, but the thing is, as a younger person, all you really have to gain are the modest anabolic effects of GH. The other stuff, skin turnover, fast healing etc, are likely already present and won’t improve from where they are. You’ll have to decide if it’s worth it.
Baseline IGF-1, and how much GH it takes to get to Z 2-3 should help make that decision.
At that point, 6+ IUs, you’ve also got to start thinking about testing IGF binding proteins levels too, because huge doses of exogenous GH, even if you’re keeping IGF-1 physiological (Z 2) or modestly supraphysiological (Z 3), is going to ramp up those IGFBPs and could result in lower bioavailable IGF than you started with,
It’s a lot to manage, and the higher the dose goes, the more complicated it gets.
Certainly more complicated for a 22 year old to figure out if 10ius to get to Z 2.5 is worth the trouble and expense vs a 45 year old using 3ius to get to Z 2.5 who sees and feels all kinds of improvements the young guy won’t, doesn’t have to worry about IGFBPs at that relatively low rHGH dose, and gets 3x as many doses out of the same kit the 22 year old is using.