Comparison

AOD-9604 vs SS-31

Function

While AOD-9604 is studied as an anti-obesity peptide that can reduce weight gain and increase fat oxidation in obese animal models with generally neutral effects on IGF-1 and glucose metabolism in early human trials71111115, SS-31 improves mitochondrial bioenergetics, reduces oxidative stress, and shows protective effects in models of ischemia-reperfusion, neurodegeneration, and other mitochondrial disorders4637137.

Mechanism

While AOD-9604 works as a synthetic fragment of human growth hormone corresponding to residues 176–191 with an added N-terminal tyrosine, retaining lipolytic but not growth-promoting actions; proposed to stimulate lipolysis and inhibit lipogenesis in adipose tissue, partly via β3-adrenergic pathways without significantly activating the full GH receptor–IGF-1 axis6171111, SS-31 is a mitochondria-targeted tetrapeptide, d-Arg-dimethylTyr-Lys-Phe-NH2, that selectively binds cardiolipin in the inner mitochondrial membrane, stabilizing cristae structure, improving electron transport, and reducing ROS production4637137143.

Length and Sequence

AOD-9604 is 16 amino acids long, whereas SS-31 is shorter as it has a length of 4 amino acids. AOD-9604 is made up of a sequence of Tyrosine, Leucine, Arginine, Isoleucine, Valine, Glutamine, Cysteine, Arginine, Serine, Valine, Glutamic acid, Glycine, Serine, Cysteine, Glycine, Phenylalanine. SS-31 is made up of a sequence of Arginine, dimethylTyr, Lysine, Phenylalanine.

Receptor

AOD-9604

Acts indirectly on adipocytes, with mechanistic work implicating β3-adrenergic receptor–linked signaling in fat metabolism rather than direct GH receptor activation71111

SS-31

Cardiolipin-rich inner mitochondrial membrane; interacts with cardiolipin and associated mitochondrial proteins rather than a classical cell-surface receptor46137143

Organism or Origin

AOD-9604

Synthetic peptide fragment derived from human pituitary growth hormone (GH1 protein) 111107114

SS-31

Fully synthetic Szeto–Schiller tetrapeptide; not encoded in the genome4637

Gene

AOD-9604

GH1

SS-31

Not assigned in the current dataset.

Related articles

No related articles are linked to these peptides yet.

Sources

61AOD-9604 – hGH 176–191 Analog Research Peptide ..., https://www.polybiotech.co/products/aod-9604-5mg
71Body-Fat Metabolism: AOD-9604 & GH Fragment 176–191 - Tide Labs, https://tidelabs.co.uk/blogs/articles/aod-9604-gh-frag-176-191-research-on-body-fat-metabolism
107Growth hormone 1 - Wikipedia, https://en.wikipedia.org/wiki/Growth_hormone_1
111Effects of Human GH and Its Lipolytic Fragment (AOD9604) on Lipid ..., https://academic.oup.com/endo/article/142/12/5182/2988749
114GH1 growth hormone 1 GH GH-N GHN IGHD1B hGH-N, https://www.sigmaaldrich.com/US/en/genes/gh1
115Peptide Spotlight: AOD 9604 - The Wellness Lounge, https://www.akwellnesslounge.com/blog/peptide-spotlight-aod-9604
46Discovery of novel SS-31 (d-Arg-dimethylTyr-Lys-Phe-NH2 ... - PMC, https://pmc.ncbi.nlm.nih.gov/articles/PMC11409442/
56Discovery of novel SS-31 (d-Arg-dimethylTyr-Lys-Phe-NH2 ..., https://pubs.rsc.org/en/content/articlelanding/2024/ra/d4ra05517a
137Mitochondrial protein interaction landscape of SS-31 | PNAS, https://www.pnas.org/doi/10.1073/pnas.2002250117
143SS-31 Peptide: Mitochondrial Repair for Energy and Longevity, https://revolutionhealth.org/blogs/news/peptide-therapy-ss-31