HGH Fragment 176-191
A modified fragment of human growth hormone; not FDA-approved.
What it is
HGH Fragment 176-191 is the tail end of the growth-hormone molecule, promoted online for fat loss on the strength of animal and in-vitro lipolysis work. It is closely related to AOD-9604 — which is essentially this fragment stabilized — and that relationship is inconvenient for its marketing.
AOD-9604 carried the fragment hypothesis into controlled human obesity trials and failed. Fragment 176-191 itself has no published controlled human trials, so its sales pitch rests on animal data whose human translation was already tested by its stabilized sibling.
What researchers have actually studied it for
Lipolysis in animal and laboratory studies; the closely related AOD-9604 tested the concept in human trials without success.
How it works
The C-terminal 16 amino acids of hGH, carrying the molecule's lipolytic signaling region without the growth-receptor engagement — fat-cell effects in rodents and cell culture, no IGF-1 axis involvement. Identical conceptual territory to AOD-9604, minus the stabilizing modification and minus the trials.
Where it came from
Fragment studies from the 1970s–90s mapped hGH's regions and found the fat-active tail, work that fed directly into AOD-9604's development. When that program failed and ended, the unstabilized fragment lived on in research-chemical catalogs, marketed on the pre-failure literature.
What the research record actually contains
- Rodent and in-vitro lipolysis studies of the fragment region.
- No published controlled human trials of Fragment 176-191 itself.
- The stabilized analog's failed human obesity program — the closest thing to a human answer, and it was negative.
What's known about risks
No human characterization. The AOD-9604 program suggests the fragment class is tolerable; sourcing and contents of gray-market vials are their own uncontrolled risk.
Where it stands legally
Never approved; research-chemical channel only.
Worth asking a licensed provider
- 1.What distinguishes this from AOD-9604, whose human trials failed?
- 2.Is there any human evidence at all connecting this fragment to fat loss?
- 3.What evidence-backed fat-loss options should we be discussing instead?