
Faaska
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- Aug 24, 2023
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Serum IGF-I is not a reliable pharmacodynamic marker of exogenous growth hormone activity in mice - PubMed
Serum IGF-I is a well-established pharmacodynamic marker of GH administration in humans and has been used for this purpose in animal studies. However, its general suitability in wild-type laboratory mice has not been demonstrated. Here we show that treatment with recombinant human GH (rhGH) in...

Tldr:
Increase in mass and muscle were observed in mice treated by hgh,while serum igf1 levels didn't increase (probably due to somatosin inhibition of igf1 production). Is the fat loss/energy releasing component of hgh important for increases in mass? This would also explain subpar results for igf 1 therapy.
P.s this dosent apply as much to humans although we do have somatosin levels rise I've seen a lot of studies in which igf 1 levels have risen during therapy

Responses to growth hormone (GH) therapy in short children with normal GH secretion and no bone age delay: an analysis of potential factors affecting their response to rhGH therapy. A controlled study - PubMed
We report significant gain in Ht-SDS in prepubertal children with ISS on rhGH therapy and better response in younger children and in those with Ht-SDS > 1 SD below their MP-Ht-SDS.

This study leads me to believe a stack for heightmaxxing should be all encompassing for maximum results. E.g AI,Somatosin inhibitor,hgh and/or without igf 1 (preferably not L3 due to it not binding to binding proteins) and something to manage insulin issues like test or metformin.
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