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Original illustration for Oxytocin research notes: abstract molecular artwork in orange and teal
Original illustration by USA Peptide Vendors; artistic, not a structural model.

Growth & signaling research peptides

Sourcing Oxytocin, step by step

Nine-residue neurohypophysial hormone with a disulfide ring. Oxytocin acts on a single G protein–coupled receptor.

GrowthCAS 50-56-69 residuesUpdated 2026-11-09

  1. Confirm what Oxytocin is

    Amino acid sequence · 9 residues
    1. C1
    2. Y2
    3. I3
    4. Q4
    5. N5
    6. C6
    7. P7
    8. L8
    9. G9

    Disulfide bond between Cys1 and Cys6.

    CAS number
    50-56-6
    Molecular formula
    C43H66N12O12S2
    Molecular weight
    1007.2 g/mol
    PubChem CID
    439302
    Length
    9 residues

    Verified 2026-11-09 against PubChem CID 439302. Values we couldn't verify are left out.

  2. Know the proposed mechanism

    Oxytocin acts on a single G protein–coupled receptor. Purgo sells it only in the PT-141 / Oxytocin (XO) spray blend.

    Mechanism map

    Evidence level: Established physiology (review). All mechanism maps

    Oxytocin mechanism diagramOxytocin receptor signaling through Gq and calcium. Targets: OXTR. Signaling: Gq → PLC → Ca²⁺ ↑. Effects reported: Uterine contraction, Milk ejection, Social behaviour.Oxytocin mechanism mapOxytocin receptor signaling through Gq and calciumOxytocincyclic nonapeptideOXTRoxytocin receptor [1]Gq[1]PLC[1]Ca²⁺ ↑[1]Uterine contraction[1]Milk ejection[1]Social behaviouranimal studies [1]Evidence: Established physiology (review). Numbers in brackets refer to the cited sources.usapeptidevendors.com · Research Use OnlyRECEPTORSIGNALINGEFFECTS REPORTED
    Purgo sells oxytocin only in a spray blend with PT-141. Open SVG
    1. Gimpl G et al. The oxytocin receptor system: structure, function, and regulation. Physiol Rev. 2001;81:629-83.

  3. Compare two documented suppliers

    24 of 112 directory vendors list Oxytocin; 10 name their testing lab.

  4. Verify the lot before use

    1. Match the CAS number on the certificate to 50-56-6.
    2. A 9-residue peptide should show a mass-spec identity near 1007.2 g/mol; HPLC purity alone doesn't confirm identity.
    3. 24 of the 112 vendors in our directory list Oxytocin; 10 of those name the lab that tests it.

FAQ

What is Oxytocin?

Nine-residue neurohypophysial hormone with a disulfide ring. Oxytocin acts on a single G protein–coupled receptor. Purgo sells it only in the PT-141 / Oxytocin (XO) spray blend.

What are Oxytocin's CAS number and molecular weight?

CAS 50-56-6, formula C43H66N12O12S2, 1007.2 g/mol, per PubChem CID 439302.

Is research-grade Oxytocin for human use?

No. Vendor material is sold for Research Use Only, not for human or veterinary use.