Ac-SDKP vs AOD-9604

Inhibits hematopoietic stem cell entry into S-phase. Blocks TGF-β1-mediated fibroblast activation, reducing collagen deposition. Promotes angiogenesis via VEGF upregulation. Regulated in vivo by ACE enzyme.

A naturally occurring tetrapeptide derived from thymosin beta-4 cleavage by prolyl oligopeptidase. Potent anti-fibrotic properties studied in cardiac, pulmonary, and renal fibrosis. Also promotes angiogenesis and wound healing.

AOD-9604 stimulates lipolysis and inhibits lipogenesis through mechanisms believed to be independent of the insulin-like growth factor pathway. It appears to mimic the fat-metabolising action of growth hormone without triggering the proliferative effects associated with full GH or GH-releasing peptides. Oral bioavailability has been observed in some formulations, making it of interest for non-injectable protocols.

AOD-9604 is a synthetic fragment of the human growth hormone molecule, corresponding to amino acids 176–191 of the C-terminus. It is researched specifically for its lipolytic properties and is considered a lower-risk alternative to full growth hormone analogues for body composition research, given its apparent lack of effect on insulin sensitivity or IGF-1 levels.