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CJC-1295 Ipamorelin vs Tesamorelin in practice: Our detailed write-up on Tesamorelin itself, including what it is and how it works, is in our full guide to the Tesamorelin peptide, what it is, how it works, and why searches are skyrocketing for patients weighing both options

The Short Answer If you are choosing between growth-hormone peptides in 2026, your real decision is between two approaches

This negative feedback loop forms part of the GH-IGF-1 axis

Evidence snapshot: The strongest human evidence comes from a 2-year randomized controlled trial in 65 healthy older adults (Nass et al., 2008, Annals of Internal Medicine) showing sustained GH/IGF-1 increases and preserved fat-free mass, plus an earlier short-term human polysomnography study on sleep (Copinschi et al., 1997, Neuroendocrinology, PMID 9349662)

In their subsequent in vitro studies using cultured proximal tubular cells, they could demonstrate that proximal tubular fluid from nephrotic rats activates IGF-1R, suggesting that filtered IGF-1 is bioactive [218]