What Is HGH Fragment 176-191? A Research Primer
HGH Fragment 176-191 is a synthetic peptide matching the C-terminal region of human growth hormone. Sold for laboratory research use only.
HGH Fragment 176-191 is a synthetic peptide corresponding to amino acids 176 through 191 at the C-terminus of human growth hormone. It is a 16-amino-acid sequence taken in isolation from the rest of the 191-amino-acid hormone. It is offered strictly as a research-use-only compound.
What makes HGH Fragment 176-191 distinct
It represents only the C-terminal end of growth hormone, not the full hormone. It is closely related to AOD-9604, a 16-residue analog of the hGH C-terminus (residues 177-191 with an N-terminal tyrosine).
Research-use status
- Published literature is mostly animal and cell work
- Structure: the C-terminal 16 amino acids of human growth hormone
- Sold for laboratory research use only; this page does not summarise effects or uses
COA and verification considerations
Because research compounds are unregulated, the certificate of analysis is the single most important thing to check. For HGH Fragment 176-191, a trustworthy COA names the testing laboratory, reports HPLC purity (typically 99% or higher), confirms identity by mass spectrometry, and, for injectable-format material, includes endotoxin and sterility results. A batch or lot number that matches the product, a recent test date, and a working verification portal are strong positive signals.
What to check before buying
- Is a named third-party lab shown, not just a claim of testing?
- Does the COA lot number match the batch you are buying, with a recent date?
- Are purity and identity both reported, ideally with endotoxin and sterility?
- How does the vendor rank on our published, testing-led formula?
Frequently Asked Questions
Is this the same as AOD-9604?
Almost. AOD-9604 is a 16-residue analog of the hGH C-terminus (residues 177-191 with an N-terminal tyrosine), so it differs from Fragment 176-191 at the first position. The COA should specify the exact sequence tested.
What belongs on the COA?
A named third-party lab, HPLC purity of 99%+, mass-spec identity, and endotoxin and sterility results for injectable-format research material.
How do you rank vendors for it?
By our published, testing-led formula. Affiliate status has no effect on the ranking.