If you could improve only one thing: Hormones? Recovery? Sleep? Blood Flow?

Wonder if individual GH sensitivity changes the outcome

GH pulse timing probably matters IMO

I’ve used Hospira for HGH BPC and CJC over the last couple years. Never had any issues but I also keep everything refrigerated and use clean technique every time

Fair point but if two sterile BAC waters meet the same standards I don’t expect magic from one brand