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Experimental/Fat LossResearch peptide

AOD-9604

A fragment of human growth hormone studied for fat-burning effects without the broader anabolic actions of HGH.

Educational explainer of a research peptide. Profiles in this section deliberately omit clinical-trial citations, dosing protocols, and purchase links. Not FDA-approved as a supplement; not a recommendation to use.

Overview

AOD-9604 is a modified fragment (residues 176-191) of human growth hormone designed to retain HGH's lipolytic effects without its growth-promoting effects.

Source
  • Synthesized in research and pharmaceutical laboratories
Forms
  • Subcutaneous injection
  • Oral / sublingual (compounded, debated efficacy)

Mechanism of action

Stimulates lipolysis and inhibits lipogenesis in adipocytes, reportedly without impacting IGF-1 or blood glucose like full HGH does.

Pathways
  • · Beta-3 adrenergic signaling (proposed)
  • · Lipolysis in adipocytes
  • · Lipogenesis inhibition
Receptors
  • · Beta-3 adrenergic receptor (proposed)

How it acts on the body

AOD-9604 is the C-terminal tail of human GH — the region that contains its fat-mobilizing activity. By isolating that fragment, researchers hoped to capture the lipolytic effect of GH without activating the GH receptor itself, avoiding rises in IGF-1, insulin resistance, and tissue overgrowth.

Mechanistically it appears to work by upregulating beta-3 adrenergic activity in adipocytes, increasing the breakdown of stored triglycerides into free fatty acids while simultaneously suppressing the enzymes responsible for storing new fat. Whether the effect size translates from animal models to humans is debated, and clinical trial results have been modest at best — but the appeal is that, unlike full HGH, it shouldn't disrupt blood sugar or push the GH/IGF-1 axis.

Hormonal & endocrine impact

How this peptide is reported to shift specific hormones and signaling molecules. Directionality reflects research literature and preclinical models, not clinical prescribing data.

Projected hormonal trajectory
Illustrative curves derived from reported direction of effect. Not measured patient data.

Curves are schematic shapes (sigmoid for increases/decreases, damped oscillation for modulation/stabilization) anchored to a 100% baseline. They communicate direction and tempo of change reported in research literature — not absolute hormone concentrations.

Growth hormoneStabilizes
Does not bind the GH receptor; no GH or IGF-1 elevation.
IGF-1Stabilizes
Designed specifically to avoid the IGF-1 rise that comes with full GH.
Insulin sensitivityStabilizes
No clinically significant change reported.
Free fatty acidsIncreases
Lipolysis releases stored fat into circulation for oxidation.
Adipocyte beta-3 signalingIncreases
Proposed mechanism for selective lipolysis.

Effects on the body

Increases
Lipolysis in fat tissue
Decreases
Lipogenesis
Supports
Body recomposition (preclinical)

Organ system effects

Liver

May modestly support lipid handling.

Skeletal Muscle

Spares lean tissue while preferentially targeting fat in animal models.

Reported effects

Drawn from preclinical research, anecdote, and small-scale clinical observation. No evidence grades are assigned — most peptides on this page lack rigorous human trials.

  • Targeted fat-burning without GH-related insulin effects
  • Anecdotal reports of slow, steady body recomposition
  • Investigated for joint and cartilage repair as an adjunct

Potential side effects

Common
  • · Injection-site reaction
  • · Mild fatigue
Rare
  • · Headache
  • · Nausea
Serious
  • · Human clinical efficacy has been modest; long-term safety is not fully characterized

Drug interactions

Beta blockers
Theoretical antagonism of lipolytic pathway.
minor

Pairing context

Often combined with
  • Resistance training and caloric deficit
    Best results when paired with lifestyle.
Avoid combining with
  • Pregnancy
    No safety data.
Important. Research peptides described here are not FDA-approved supplements. Supplement Scholar does not endorse, recommend, or link to any source for purchase. Consult a qualified clinician before considering any peptide therapy.