Peptide Reference Desk
AOD9604 vs HGH Fragment 176-191: why the names are often confused
A laboratory-focused guide to AOD9604 and HGH fragment naming, sequence disclosure, molecular-mass checks and evidence attribution.
The label is not enough
AOD9604 is commonly described as a modified fragment based on the C-terminal region of human growth hormone. “HGH Fragment 176-191” is used loosely across catalogs, sometimes for material presented as equivalent and sometimes without enough structural detail to tell. That is why two pages can use near-identical marketing language while listing different expected masses.
The practical answer is to stop treating the names as specifications. Ask for the sequence.
A five-minute identity check
- Copy the sequence exactly as supplied, including any additional N-terminal residue.
- Record N- and C-terminal chemistry and the stated salt form.
- Calculate expected mass for that structure.
- Compare it with the COA’s observed LC-MS ions, accounting for charge states.
- Check that the chromatogram belongs to the same lot and that purity is not being presented as content.
If the sequence is missing, the record cannot resolve whether “AOD9604” and “fragment 176-191” refer to the same material.
Evidence must follow the molecule
Searches for AOD9604 retrieve cell studies, animal work, older clinical development and a large amount of weight-loss marketing. Before citing a result, confirm the paper’s compound description. Evidence attached to full-length growth hormone does not automatically apply to a fragment; evidence for one fragment construct does not automatically apply to another.
| Source says | Archive action |
|---|---|
| “hGH fragment” only | Flag structure as unresolved. |
| Residue range plus sequence | Recalculate mass and retain both fields. |
| AOD9604 development material | Capture sponsor, formulation and study identifier. |
| Vendor equivalence claim | Do not accept without structural and analytical support. |
What this page does not answer
It does not rank products or provide weight-loss guidance. Its purpose is narrower and more useful: making sure a literature citation, catalog record and COA are talking about the same molecular construct.
Where to verify the record
Use the primary paper, regulator document or lot-linked analytical file for the claim it actually supports. Search snippets and vendor summaries are discovery tools, not final evidence.