Sh-Heptapeptide-13 is a single chain recombinant human peptide, produced synthetically to be identical to the protein, Angiotensin 1, which is derived from Angiotensinogen (AGT). It contains 7 amino acids consisting of arginine, aspartic acid, histidine, isoleucine, proline, tyrosine, and valine. See Reported Ingredient Function.