What Is the AOD 9604 Peptide?
AOD 9604 is a synthetic 16-amino acid peptide fragment derived from the C-terminal region of human growth hormone, specifically the sequence spanning positions 176 to 191. The compound incorporates a modified N-terminal tyrosine residue for structural stability and was originally developed by researchers studying the lipolytic properties of human growth hormone.
Molecular Profile
| Property | Value |
| CAS Number | 386264-39-7 |
| Molecular Formula | C78H123N23O23S2 |
| Molecular Weight | 1815.12 g/mol |
| PubChem CID | 16131447 |
| Sequence | Tyr-Leu-Arg-Ile-Val-Gln-Cys-Arg-Ser-Val-Glu-Gly-Ser-Cys-Gly-Phe (Disulfide Bridge: Cys7-Cys15) |
| Purity | 99%+ HPLC |
| Form | Lyophilized powder |
| Intended Use | Research use only (RUO) |
The disulfide bridge connecting Cys7 and Cys15 within the AOD 9604 sequence constrains the peptide’s three-dimensional conformation and contributes to its stability across research conditions. AOD 9604 retains this structural feature as a design element that supports consistent interaction with target sites in preclinical models.
AOD 9604 belongs to a class of growth hormone fragment peptides designed to capture the lipolytic domain of the parent molecule without replicating its systemic endocrine effects. The compound was developed to stimulate fat breakdown and inhibit new fat formation while avoiding the IGF-1 elevation, glucose intolerance risk, and carpal tunnel syndrome concerns associated with full growth hormone administration.
Azoth supplies AOD 9604 synthesized to 99%+ purity verified by HPLC analysis, delivered in lyophilized powder form with a Certificate of Analysis for each production batch. AOD 9604 from Azoth is intended exclusively for licensed researchers and laboratory professionals conducting in vitro and preclinical research.
How Does AOD 9604 Work? Lipolytic Mechanisms in Preclinical Models
Research in animal models and in vitro systems has identified multiple mechanisms by which AOD 9604 affects fat metabolism. The compound’s activity profile has been characterized through studies in obese mice, beta-3 adrenergic receptor knockout models, and metabolic analyses comparing AOD 9604 to the parent growth hormone molecule.
Beta-3 Adrenergic Receptor Activation
The mechanism attributed to AOD 9604 in early preclinical research involves its interaction with beta-3 adrenergic receptors located on white adipose tissue. These receptors regulate lipolysis, the enzymatic process by which stored triglycerides within fat cells are converted into free fatty acids and glycerol for metabolic use. In obese animal models, AOD 9604 administration was associated with increased rates of fat oxidation through this receptor pathway.
Beta-3 adrenergic receptor activation was the original mechanistic hypothesis for AOD 9604’s fat loss effects. AOD 9604 was developed in part because this receptor type was identified as a target for fat mobilization research in white adipose tissue.
Receptor-Independent Lipolytic Pathways and AOD 9604
Research in beta-3 adrenergic receptor knockout mice demonstrated that AOD 9604 continued to stimulate fat breakdown even in animals lacking these receptors, establishing that the peptide operates through at least one additional lipolytic mechanism. This finding shifted the research understanding of AOD 9604 from a single-receptor compound to one with a more complex fat metabolism profile.
The receptor-independent mechanism driving AOD 9604’s lipolytic activity in knockout models has not been fully characterized in the published literature. Researchers have proposed that AOD 9604 may interact with pathways involved in white fat cell apoptosis, though this hypothesis remains under investigation.
AOD 9604 and Lipogenesis Inhibition
In addition to stimulating fat breakdown, AOD 9604 has been studied for its ability to inhibit lipogenesis, the process by which the body synthesizes and deposits new fat. Preclinical data from Ng et al. (2000) characterized AOD 9604 as a synthetic lipolytic domain of human growth hormone, establishing that the compound promotes fat mobilization and simultaneously reduces fat storage.
This dual action, addressing both lipolysis stimulation and lipogenesis inhibition, distinguishes AOD 9604 from compounds that target only one side of the fat metabolism equation.
AOD 9604 versus Full Growth Hormone: An Important Research Distinction
The functional difference between AOD 9604 and full growth hormone is a central distinction across the published research record. Full growth hormone activates IGF-1 production, promotes tissue growth across multiple organ systems, and affects blood glucose regulation. AOD 9604 does none of these things at the doses and in the populations studied.
AOD 9604 does not elevate IGF-1 levels, does not raise blood glucose, and does not promote insulin resistance in the research contexts examined. Side effects associated with full growth hormone, including fluid retention and carpal tunnel syndrome, were absent from the AOD 9604 clinical research record at therapeutic doses studied. This separation from full growth hormone’s systemic profile positions AOD 9604 as a targeted research tool for studies focused specifically on fat metabolism.
No antibodies against AOD 9604 were detected across the clinical research program, consistent with the compound’s structural similarity to an endogenous sequence within human growth hormone.
AOD 9604 in Peptide Therapy Research: Structural Profile
Within peptide therapy research, AOD 9604 represents a fragment-based approach to studying the fat metabolism functions of the growth hormone molecule. The 16-amino acid sequence of AOD 9604 captures the active lipolytic domain of the 191-amino acid human growth hormone molecule while excluding the regions responsible for growth hormone receptor binding and downstream anabolic signaling.
The N-terminal tyrosine modification and internal disulfide bridge give AOD 9604 structural stability that supports consistent experimental outcomes across peptide therapy research protocols. Researchers working in peptide therapy contexts have noted AOD 9604’s specificity and structural stability as features that make it a useful reference compound in fat metabolism studies where full growth hormone administration would confound results.