AOD-9604 Looks Familiar—but One Residue Changes the Identity
Search for AOD-9604 peptide and you will frequently see it described as:
HGH Fragment 176-191.
That description is convenient.
It is not completely precise.
FDA scientific material describes AOD-9604 as a 16-amino-acid peptide corresponding to hGH residues 177–191 with an additional N-terminal tyrosine. It also contains an intramolecular disulfide bond between two cysteine residues.
That means AOD-9604 is closely related to HGH Fragment 176-191—but professional laboratories should not automatically treat the two names as interchangeable.
What Is AOD-9604?
AOD-9604 is commonly represented by the sequence:
YLRIVQCRSVEGSCGF
and is also described as Tyr-hGH(177-191).
Its molecular weight is approximately 1815.1 Da, compared with roughly 1799.1 Da for the native HGH Fragment 176-191 sequence. The difference reflects the N-terminal residue modification.
This distinction supports useful research keywords such as:
AOD-9604 peptide
Tyr-hGH(177-191)
growth hormone fragment analogue
AOD-9604 research peptide
For B2B procurement, however, the key question is not what name appears on a search result.
It is:
Does the analytical data support the intended sequence and molecular identity?
The Human Weight-Loss Evidence Is More Complicated Than the Headlines
AOD-9604 was developed as a potential obesity treatment.
Early research generated interest in whether a C-terminal growth-hormone-derived peptide could influence lipid metabolism without reproducing the broader activity of full-length growth hormone. A 2004 review described AOD-9604 as an obesity-development candidate.
But later human efficacy results were disappointing.
FDA’s review of available clinical studies states that AOD-9604 did not demonstrate statistically significant weight loss compared with placebo in patients with obesity.
A structured review of the Phase 2b obesity program similarly reports that the randomized study failed to separate from placebo and that the obesity-development program was discontinued.
For responsible scientific SEO:
preclinical lipolysis research should not be rewritten as proven human weight-loss efficacy.
Positive and Negative AOD-9604 Reviews Show Why Anecdotes Are Difficult
Community experiences are highly inconsistent.
Some users report perceived reductions in body fat or waist measurements. In one Reddit discussion, a user believed body fat had decreased even though body weight had not changed.
Other users report essentially no noticeable effect. A June 2026 discussion included several participants citing the negative Phase 2b data or stating that they personally noticed little to no benefit.
A more recent August 2026 thread likewise contained both people attributing substantial weight change to broader stacks and users saying AOD-9604 itself had done nothing.
These experiences are anecdotal.
Diet, exercise, concurrent peptides, GLP-1 drugs and unknown product identity create major confounding factors.
For professional buyers:
reviews describe perception; analytical documentation describes the material.
Why Sequence and Disulfide Identity Matter
AOD-9604 is more than a generic “GH fragment.”
The defined sequence and disulfide structure are part of the research identity.
Professional laboratories should therefore verify:
Sequence identity — Does the material correspond to YLRIVQCRSVEGSCGF?
Molecular mass — Does appropriate analytical testing support AOD-9604 rather than a related GH fragment?
Disulfide state — Is the intended peptide structure supported by the specification?
HPLC purity — Is the purity result connected to the actual lot?
Batch COA — Does the certificate match the shipment?
Traceability — Can the supplied material be linked to the applicable production and QC documentation?
For peptides with closely related analogues:
one residue can be enough to define a different research material.
SUNONE AOD-9604 Research Peptide
SUNONE supplies AOD-9604 / AOD9604 / Tyr-hGH(177-191) for qualified laboratory and manufacturing research.
Current product information includes:
CAS: 221231-10-3
Sequence: YLRIVQCRSVEGSCGF
Molecular Formula: C78H123N23O23S2
Molecular Weight: 1815.1 g/mol
Grade: ≥99%, HPLC
Form: Lyophilized Powder
Storage: 2–8°C, protected from light
B2B Configurations: 2 mg, 5 mg and 10 mg vial formats
Documentation: batch-specific COA, SDS and product specification information.
View SUNONE AOD-9604 Specifications :
Looking for an AOD-9604 Supplier with COA?
For peptide laboratories, biotechnology companies and research distributors, the strongest sourcing question is not:
“Do you sell HGH Fragment?”
It is:
“Can you verify that this batch is specifically AOD-9604?”
If your organization is evaluating AOD-9604 peptide, Tyr-hGH(177-191), growth hormone fragment analogues or related metabolic research peptides, SUNONE can provide current batch specifications, analytical documentation, MOQ, packaging and B2B quotation information.
Conclusion
AOD-9604 illustrates why related peptide names should not be treated as interchangeable.
AOD-9604 is not simply native HGH Fragment 176-191.
Preclinical metabolic findings are not proof of clinically meaningful human weight loss.
And a product name does not establish molecular identity.
For professional procurement:
verify the sequence, verify the molecular identity, verify the HPLC result and verify the batch-specific COA.
The familiar GH-fragment story may generate the search.
Molecular precision should generate the inquiry.
This content is provided for scientific and educational purposes only. SUNONE research peptide is for qualified labrtorynt, diagnois, druc tor mmatct or veteimant, use.research only, Not for human consumption, clinical treame. Purchasers are responsible for complying with applicable laws and regulations in their jurisdiction.
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