HGH Fragment 176-191 vs Ipamorelin
A detailed side-by-side comparison of HGH Fragment 176-191 and Ipamorelin covering dosing, storage, research findings, and practical usage.
Overview
HGH Fragment 176-191: The lipolytic fragment of human growth hormone (amino acids 176-191), targeting fat metabolism without the growth-promoting or diabetogenic effects of full-length HGH.
Ipamorelin: A selective GH secretagogue with minimal effect on cortisol or prolactin.
Comparison Table
| Property | HGH Fragment 176-191 | Ipamorelin |
|---|---|---|
| Category | Fat Loss | Growth Hormone Secretagogue |
| Typical Dose | 250-500 mcg | 100-300 mcg |
| Frequency | 2x daily | 2-3x daily |
| Half-Life | ~30 minutes | 2-3 hours |
| Timing | Morning fasted and before bed | Morning fasted, post-workout, and before bed (fasted 2+ hours) |
HGH Fragment 176-191 Research
HGH Fragment 176-191 is a synthetic peptide corresponding to the C-terminal portion (amino acids 176-191) of human growth hormone. Research published in journals including Endocrinology and Obesity Research has demonstrated that this specific fragment retains the lipolytic (fat-burning) activity of full-length HGH while lacking the growth-promoting and diabetogenic effects. In vitro studies show it stimulates lipolysis and inhibits lipogenesis in adipose tissue. Animal studies have demonstrated significant reductions in body fat without changes in IGF-1 levels, blood glucose, or insulin sensitivity — a key advantage over exogenous HGH. The fragment works by mimicking the way natural growth hormone regulates fat metabolism, specifically through beta-3 adrenergic receptor pathways. AOD-9604, a closely related peptide with an additional tyrosine residue, reached Phase 2b clinical trials for obesity. HGH Frag 176-191 remains an active area of research for targeted fat reduction without systemic growth hormone effects.
Ipamorelin Research
Ipamorelin is a synthetic pentapeptide that acts as a selective growth hormone secretagogue. Unlike other GHRPs, ipamorelin specifically stimulates growth hormone release without significantly affecting cortisol, prolactin, or aldosterone levels, making it one of the cleanest GH-releasing peptides available. Research shows it provides a controlled, dose-dependent GH pulse similar to natural secretion patterns. Studies demonstrate benefits for body composition, sleep quality, and recovery. Ipamorelin is often combined with CJC-1295 (no DAC) for synergistic effects, as they work through complementary pathways (GHRP + GHRH).
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For laboratory research use only. Not for human consumption.