AOD-9604 Research Guide: HGH Fragment 176-191 and Lipolysis Pathway Studies

For in-vitro and laboratory research only. AOD-9604 is a research-grade peptide; no medical or clinical guidance is implied.

AOD-9604 is a synthetic 16-amino-acid peptide derived from the C-terminal region of human growth hormone (residues 177-191, with an N-terminal tyrosine added for synthesis purposes — sometimes confusingly described as "HGH fragment 176-191"). Published preclinical literature has examined the peptide for lipolytic activity that is, according to the dominant research framing, dissociated from the IGF-1-mediated growth signaling of full-length growth hormone. Available as AOD-9604 5mg lyophilized.

Origin

The C-terminus of growth hormone was identified in 1990s research as carrying a lipolytic activity distinct from the broader growth-promoting effects of the parent hormone. AOD-9604 was developed as a synthetic representation of this fragment for research and clinical-investigation use, with the additional N-terminal tyrosine added to enable radiolabeling and synthesis.

Mechanisms reported in published literature

• Lipolytic activity in adipocyte models. Cell-culture studies report increased lipolysis in 3T3-L1 and primary adipocyte models.
• Inhibition of lipogenesis. Some published work reports reduced fatty-acid synthesis under AOD-9604 treatment.
• Dissociation from IGF-1 axis. The defining mechanistic claim is that AOD-9604 produces these effects without significant IGF-1 elevation — an important difference from full-length growth hormone or from CJC-1295-type GH-axis stimulants.

Research note: Several clinical trials of AOD-9604 in adiposity research failed to demonstrate the body-composition effects observed in rodent models. The discrepancy between preclinical and clinical literature is significant and should be considered when interpreting any AOD-9604 study.

Common research-model applications

• 3T3-L1 adipocyte lipolysis and lipogenesis assays
• Rodent diet-induced-obesity models
• Cartilage-research models (a less-cited area; AOD-9604 has appeared in some chondrocyte studies)

Related research peptides

For other compounds in metabolic and growth-pathway research, see our overviews of Sermorelin vs Tesamorelin vs CJC-1295 and GLP-1 research peptides.

Handling and storage

AOD-9604 ships lyophilized and follows standard peptide-storage protocol — see our peptide storage guide. Reconstitution is typically in bacteriostatic water.

What to verify on the COA

• Sequence: the 16-residue sequence including the N-terminal tyrosine. Confirm the disulfide bond (if expected) between residues that form the loop structure.
• Purity ≥98% by HPLC.
• Mass spec match.

See how to read a peptide COA.

Reminder: All material above is summarized from preclinical and clinical research literature for laboratory and educational use. Products are not intended for human consumption.