AOD-9604

GH fragment

A fragment of growth hormone isolated for its fat-metabolism effects — which largely failed to reproduce in human trials.

Evidence strength: Limited evidence. Mechanism is characterized; human data is small or absent. This one deserves plain speaking. The animal work showed reduced body fat. The human trials — including a properly designed twelve-week randomized study in obese participants — did not show significant weight or fat loss versus placebo. It was pursued commercially and did not become an approved obesity treatment, for the reason you would expect. The joint and cartilage research is more promising and much less discussed.

What it is

AOD-9604 is a small piece of the human growth hormone molecule — the tail end, specifically — isolated on the theory that this fragment carries growth hormone's fat-breakdown activity without its effects on blood sugar or tissue growth. The theory was elegant. The human results were disappointing, and that is the most useful thing this page can tell you.

What people use it for

Fat loss, its most heavily marketed use
Metabolic support alongside diet and training
Cartilage and joint research, a separate and arguably more interesting line of work

How it works

Growth hormone increases fat breakdown and inhibits fat formation. Researchers mapped which part of the molecule carried that effect and synthesized just that part, hoping to get the metabolic benefit without raising IGF-1 or affecting glucose. Mechanistically it does appear to work on fat cells in isolation. Whether that translates into meaningful fat loss in a living person is where the evidence stops supporting the story.

The technical version

AOD-9604 corresponds to the C-terminal fragment (amino acids 177–191) of human growth hormone. It stimulates lipolysis and inhibits lipogenesis in adipose tissue, reportedly through beta-3 adrenergic receptor pathways, without binding the growth hormone receptor — hence no IGF-1 elevation and no effect on insulin sensitivity or glucose. Separate work has examined its effects on chondrocyte proliferation and cartilage regeneration.

What to realistically expect

Based on the human trial data, honestly: not much for fat loss. It is not that the compound does nothing in a dish, it is that the effect did not survive contact with a controlled human study.

What it will not do

Every page on this site includes this section. If a source only tells you what something does, you are reading marketing.

It will not produce meaningful fat loss on its own — this is the specific claim the human trials failed to support.
It is not comparable to GLP-1 medications, which have large controlled trials showing substantial weight loss.
It will not raise growth hormone or IGF-1, which is by design but also worth knowing if that was what you wanted.
It will not compensate for a caloric surplus, and no compound in this category does.

Safety and who should be cautious

The safety profile from human trials is favorable — it was well tolerated, with no significant effects on glucose or IGF-1. In that narrow sense it is one of the safer compounds discussed here, which is faint praise for something that did not demonstrate efficacy. Not FDA-approved. Prohibited in sport under WADA rules. Not appropriate during pregnancy or breastfeeding.

Sourcing and quality

Third-party testing with a batch-matched certificate of analysis, as always. Given the weak efficacy evidence, the more important question is whether you should be buying it at all rather than whose vial to buy.

Questions worth asking your provider

Given that the human trials did not show fat loss, what is the rationale for using it?
What would actually move my body composition — and are we doing those things?
If I compete, what are the anti-doping implications?

Frequently asked questions

Does AOD-9604 work for fat loss?

The controlled human evidence does not support it. Animal studies were positive; a twelve-week randomized human trial in obese participants did not show significant benefit over placebo.

Is it banned in sport?

Yes, it is prohibited under WADA rules.

Why is it still sold?

It is inexpensive, has a good safety profile, and the animal data makes for compelling marketing. That is not the same as it working.

Have questions about your own situation?

General education only goes so far. If you want help deciding whether this is relevant to your goals, history, and current labs, schedule a consultation with the Bearing team.

Request a Consultation

Tesamorelin Mots C

Educational disclaimer. This page is for general education and is not medical advice. It does not diagnose, treat, or recommend any substance. Many peptides are not FDA-approved; legal status varies and some are prohibited in sport. Discuss any decision with a licensed provider.