Original AOD-9604: Discovery & Research History
AOD-9604 (hGH Fragment 176-191) — how it was originally engineered, and what it has been studied for since.
How AOD-9604 Was Discovered
AOD-9604 is a synthetic fragment of the C-terminus of human growth hormone (hGH 176-191), engineered by Metabolic Pharmaceuticals with a specific goal: isolating HGH's lipolytic (fat-metabolizing) activity from its growth-promoting and insulin-desensitizing effects, which limited HGH's usefulness as a weight-management compound.
This represented a different design approach from the receptor-agonist and mitochondrial-signaling compounds elsewhere in incretin and longevity research: rather than activating a receptor pathway from scratch, AOD-9604 is a truncated fragment of an existing, well-characterized hormone.
What AOD-9604 Has Been Studied For
Development was more extensive than most research peptides — Metabolic Pharmaceuticals ran six human trials in over 900 participants — but ultimately unsuccessful. A 12-week Phase IIa trial showed a modest weight-loss edge over placebo, but the pivotal 24-week Phase IIb trial (536 participants) found no statistically significant difference from placebo, and the obesity development program was discontinued in 2007.
- Lipolytic (fat-metabolizing) mechanism research
- hGH fragment pharmacology studies
- Case study in rigorous but unsuccessful drug development
AOD-9604 discovery & history questions
Does AOD-9604's research history mean it's approved for a particular use?
No. This page describes how AOD-9604 was originally engineered and what it has been studied for since — it is historical and educational context, not a claim about current regulatory approval, safety, or legal status anywhere. Any AOD-9604 sourced through KYIN Peptides is for laboratory research use only.
What has AOD-9604 been studied for in research?
AOD-9604 is studied for its lipolytic (fat-metabolizing) mechanism, isolated from HGH's growth-promoting effects, though its pivotal Phase IIb obesity trial found no significant benefit over placebo.
Interested in sourcing AOD-9604?
Not part of our standard catalogue, but available to order — contact us and we'll help you source it.