Oxytocin is one of the most familiar neuropeptides — a compact peptide of nine amino acids, closed into a small ring. It is supplied here as the acetate form for laboratory research.
Vestrand supplies it as one production lot, prepared for third-party analysis, with the certificate for your lot published to its verification page after testing.
The detail worth knowing is that its small ring, not its length, is what defines it. Written out as a flat list of nine residues it looks simple; the closed loop that makes it what it is only shows in the fuller structural record we publish, and that is the record to check incoming material against.
For laboratory research use only. Not for human or veterinary use.