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HGH Fragment 176-191: Research Overview

What is HGH Fragment 176-191? HGH Fragment 176-191 is a 16-amino-acid peptide corresponding to the C-terminal region of human growth hormone. It is studied in preclinical laboratory models of lipolysis-related pathways, which research has examined separately from the IGF-1-mediated growth signaling of the full hormone. Supplied strictly for laboratory research use.
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Technical profile

CompoundHGH Fragment 176-191 (hGH 176-191)
ClassGrowth-hormone fragment (16 amino acids)
Sequence originC-terminal region of human growth hormone, residues 176 through 191
Molecular weight~1817.1 g/mol (approximate)
Regulatory statusNot an approved drug in any jurisdiction
Sport-testing noteGrowth hormone and its fragments fall within the WADA Prohibited List class covering peptide hormones, growth factors, related substances and mimetics
Form suppliedLyophilized powder, sealed vial
StorageLyophilized: 2–8 °C, protected from light.
VerificationHPLC purity ≥99%, sterility, endotoxins, heavy metals — documented on the batch COA

What does the research literature cover?

Research interest in this fragment stems from a structural question: whether a short C-terminal segment of growth hormone behaves differently in assay systems than the intact hormone does. Published laboratory work has examined it in the context of:

Important context: the published evidence base is predominantly preclinical, and this fragment has no approved therapeutic use in any jurisdiction. Summaries here describe what researchers have studied and how experiments were framed — they are not claims about effects in humans.

Why purity matters for HGH Fragment 176-191 research

A sixteen-residue sequence gives synthesis errors plenty of room to accumulate: deletion sequences, oxidized residues, and residual scavengers can all co-elute closely with the target. Because much of the work involving this fragment is comparative, impurity-driven variability is especially costly. Every VP Peptides HGH Fragment 176-191 batch ships with a Certificate of Analysis documenting ≥99% HPLC purity plus sterility, endotoxin and heavy-metal testing from independent third-party testing.

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Frequently asked questions

Is HGH Fragment 176-191 approved for human use?

No. It is not approved by the FDA, the EMA, or any other regulatory agency, and it is not approved for human use. VP Peptides supplies it strictly as a research chemical for in-vitro and laboratory investigation. It is not a drug, supplement, or food ingredient.

Is HGH Fragment 176-191 prohibited in sport?

Growth hormone and its fragments fall within the WADA Prohibited List class covering peptide hormones, growth factors, related substances and mimetics. Athletes subject to anti-doping rules should consult the current WADA Prohibited List and their governing body directly, as list contents are revised annually.

How does it differ from AOD-9604?

Both derive from the C-terminal region of human growth hormone and are studied in overlapping lipid-metabolism model systems. AOD-9604 corresponds to the hGH 177-191 region with an added N-terminal tyrosine residue, giving it a different sequence boundary and a different molecular weight from the unmodified 176-191 fragment.

How should HGH Fragment 176-191 be stored in the lab?

Lyophilized vials should be kept at 2–8 °C and protected from light.

Fat-metabolism signaling in preclinical models

The experimental appeal of the 176-191 fragment is that it lets researchers ask a narrow question: does the C-terminal tail of growth hormone, isolated from the rest of the molecule, engage the same fat-cell signaling machinery the intact hormone is associated with? Preclinical reports frame the fragment within the β-adrenergic branch of adipocyte biology. In that model, signaling through the β3-adrenergic receptor — a Gs-coupled receptor abundant on fat cells — is linked to a downstream cascade involving cyclic AMP, protein kinase A, and hormone-sensitive lipase, the enzyme set laboratory work associates with mobilization of stored lipid.

Rodent and cell-based studies have been used to compare the fragment against full-length growth hormone in the same assays, and to test how much of a measured response tracks with that receptor pathway rather than with the IGF-1-linked, growth-promoting regions found elsewhere in the hormone. This dissociation — a short lipolytic-region fragment examined apart from the anabolic and glucose-handling domains — is the organizing idea behind most of the preclinical literature, and it remains a hypothesis these experiments were designed to probe rather than a settled fact about the compound.

Everything here describes signaling questions in preclinical systems, not outcomes in people. HGH Fragment 176-191 is not an approved drug in any jurisdiction, has no established therapeutic use, and is distinct from any approved growth-hormone product. VP Peptides supplies it solely as a research material for laboratory investigation, and none of this text characterizes a benefit of the material.

Selected research references

Related research compounds

Research use only. All products described on this page are furnished for laboratory research purposes only and are not for human or veterinary use, not for use in food or cosmetics, and not for any diagnostic or therapeutic application. Nothing on this page is medical advice or a claim of safety or efficacy in humans. Research summaries reference publicly available preclinical literature; specific citations are listed in the references above.