IGF-1 LR3 promotes protein synthesis and muscle hypertrophy IGF-1 LR3 induces a high rate of cell proliferation (hyperplasia) and division due to remaining in the bloodstream for much longer than regular IGF-1, with the effect of increasing muscle cells
J immunother Cancer
Key published studies include: Teichman et al., 2006 (JCEM): Dose-dependent GH and IGF-1 elevation with CJC-1295 DAC in healthy adults Raun et al., 1998 (Eur J Endocrinol): Ipamorelin demonstrated selective GH release without cortisol/prolactin elevation Johansen et al., 1999: Phase I/II Ipamorelin trial showed dose-response relationship with no significant adverse effects Bowers et al., 2004: Foundational research on GHRH/GHRP synergistic GH release mechanisms Neither CJC-1295 nor Ipamorelin has completed Phase 3 clinical trials
Common side effects shared by both medications: Nausea (most common, usually transient peaks during dose escalation) Vomiting Diarrhea or constipation Decreased appetite and early satiety Bloating or stomach discomfort Injection site reactions Key safety warnings that apply to both drugs: FDA Boxed Warning (both): Possible risk of thyroid C-cell tumors, based on animal studies
The intensity and duration of these effects vary widely between individuals and can influence both tolerance and adherence over time
This article examines evidence-based guidance on when to initiate tirzepatide therapy for maximum benefit and safety