AOD-9604 vs HGH Fragment 176-191
Verdict: These are near-twins: both are the lipolytic tail (176-191 region) of the growth hormone molecule, isolated so fat metabolism comes without GH's growth or glucose effects. AOD-9604 is Fragment 176-191 plus one added tyrosine for stability — and it's the only one of the pair with a human trial history (obesity trials in the 2000s, which showed modest results and were shelved commercially). Practical differences are small; AOD's oral/injectable flexibility and trial data give it the slight edge in credibility, while plain Frag is typically cheaper.
Side by side
| AOD-9604 | HGH Fragment 176-191 | |
|---|---|---|
| Typical dose | 250 mcg–500 mcg | 250 mcg–500 mcg |
| Frequency | daily, often fasted | 1–2x daily, fasted |
| Administration | subcutaneous injection | subcutaneous injection |
| Common vials | 2 mg, 5 mg | 2 mg, 5 mg |
| Typical mix | 5 mg + 2 ml water | 5 mg + 2 ml water |
| Units for typical dose | 12 units (300 mcg) | 10 units (250 mcg) |
What the trials actually showed
AOD-9604's phase 2 obesity trials found statistically significant but modest weight loss versus placebo — real signal, underwhelming magnitude, which is why it never became a drug. That result is worth internalizing: these fragments are studied as metabolic assistants, not GLP-1-scale interventions. Anyone selling them as such is selling.
Timing is the protocol
Both are dosed 250–500 mcg daily in a fasted state — most commonly on waking, ideally before fasted cardio — because insulin blunts the lipolytic mechanism. Taking either alongside a meal is the classic way to pay for a peptide and receive nothing.
Stability and handling
The added tyrosine makes AOD-9604 meaningfully more stable in solution; plain Fragment 176-191 is one of the more fragile peptides in circulation and rewards careful cold-chain handling, gentle reconstitution and shorter post-mix windows (2–4 weeks refrigerated).
Can you stack them?
Pick one, not both — identical mechanism. Either appears alongside GH secretagogues in recomposition stacks, or standalone for fasted-cardio protocols.
More comparisons
Educational comparison based on commonly published research protocols — not medical advice or an endorsement of any compound.