AOD-9604 — a cyclic hGH(177-191) fragment — studied in metabolic and lipolysis research.
AOD-9604 is a lab-made chain of 16 amino acids (the building blocks of proteins). It copies the tail end of human growth hormone — the piece scientists think is responsible for burning fat. One small change was added to make it more stable. A chemical bond folds the chain into a loop that mimics the shape of that piece inside the real hormone. Researchers at Monash University in Australia designed it in the 1990s. A company called Metabolic Pharmaceuticals then developed it. Unlike real growth hormone, AOD-9604 does not attach to the main growth-hormone receiver. It does not raise the usual blood growth signal. It does not make muscles or bones grow. Those effects were deliberately designed out. After the big 2007 weight-loss trial failed, the company relabeled it as a food ingredient instead of a drug. It has never been FDA-approved for any medical use.
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Not approved for human use. Phase 2b obesity clinical development was terminated by Metabolic Pharmaceuticals / Calzada in 2007 after the 24-week Phase 2b trial failed its primary weight-loss endpoint. AOD-9604 was subsequently repositioned as a nutraceutical ingredient and granted self-affirmed GRAS status for food use (Moré et al. 2014); the FDA has not issued an independent GRAS no-objection letter, and no NDA or BLA is open or pending. The April 15, 2026 FDA 503A Bulk Drug Substances Categories Update does not list AOD-9604 as an eligible substance for compounding in human drug products.
AOD-9604 is a cyclic hGH fragment with a Cys-Cys disulfide constraint. PubChem indexes it at CID 71300630 with formula C78H123N23O23S2, molecular weight 1815.1 g/mol, and CAS 221231-10-3.
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