What the label states, the lot delivers — net peptide mass, not gross powder weight, purity reported as measured rather than rounded up, and a Certificate of Analysis for every lot.
Net peptide mass, not powder weight; purity as measured, not rounded up; a COA per lot.
Net peptide + purity not rounded up. COA per lot.
FDA PCAC reviews 7 peptides for the 503A bulks list (BPC-157, KPV, TB-500, MOTs-C, Emideltide, Semax, Epitalon). Read our compounder's decision tree. Read our briefing →
FDA PCAC reviews 7 peptides for the 503A bulks list in July. Read →
FDA PCAC: 7 peptides under review. Read →
Posterior-pituitary neuropeptide hormone · regulated
Overview
Oxytocin is a nonapeptide hormone and neuropeptide synthesized in the paraventricular and supraoptic nuclei of the hypothalamus and released from the posterior pituitary. Popularly called the "love hormone" for its role in social bonding, trust, and empathy, it also plays a central role in uterine contraction, parturition, and lactation. The acetate is a common salt form used to improve solid-state peptide stability and simplify laboratory weighing and formulation; it does not alter the pharmacology of the active peptide itself. The synthetic injectable form (brand names Pitocin/Syntocinon) is FDA-approved for labor induction and for prevention/control of postpartum hemorrhage. Intranasal formulations remain investigational and have been studied for autism spectrum disorder, social cognition in schizophrenia, obesity/appetite regulation, anxiety, depression, and PTSD, though most large randomized controlled trials to date have failed to show benefit over placebo on their primary endpoints. Vialdyne releases Oxytocin Acetate as a lyophilized nonapeptide (cyclic, disulfide-bridged) against a ≥ 99.0% HPLC main-peak specification, with a batch-specific Certificate of Analysis covering RP-HPLC purity, mass-spec identity, water content, residual solvents, and endotoxin. Sequence / identity confirmation is documented on the released lot.
Applications & buyer fit
GH-axis peptides ship to two main buyer types: compounding pharmacies dispensing under physician supervision, and research labs studying somatotropic-axis pharmacology. Pharmacies typically want sterile-filled vials with the full release packet (sterility, endotoxin, CCI); labs typically want loose-format lyophilized powder with sequence verification. Blends (the CJC-1295 / Ipamorelin combination is the canonical example) are usually co-lyophilized rather than solution-mixed for potency stability.
Sourced for
Buyer fit
Documentation that ships
Procurement note: Sterile-filled vials are available with the full release packet (sterility, endotoxin, CCI); loose lyophilized powder ships with sequence verification.
Primary buyer fit: academic and contract research laboratories.
Specifications
Certificate of Analysis
Published released-batch COAs for Oxytocin Acetate, every lot HPLC-verified. These are previews — request the full high-resolution certificate for any lot.
VerifiedRequest full COA →Oxytocin
VD260428-OT10151 · 99.35%
VerifiedRequest full COA →Oxytocin
VD260428-OT149 · 99.40%
VerifiedRequest full COA →Oxytocin
VD260428-OT5150 · 99.03%
Regulatory note
Research-use-only reference material; not for human or veterinary use.
Selected literature
Frequently asked questions
Oxytocin's biological activity depends entirely on the cyclic structure formed by the Cys1-Cys6 disulfide bond, the linear (reduced) form has essentially no receptor binding activity. The disulfide formation during synthesis is a controlled oxidative-folding step that must favor the intramolecular cyclization over intermolecular disulfide formation between molecules. The analytical confirmation is a mass-spec check at the cyclized mass (2 Da lower than the linear reduced form) plus an HPLC retention-time check against a reference standard, since the cyclic and linear forms elute at different positions. Buyers should request the COA to confirm both checks were performed and the cyclized form is the dominant species.
Bulk oxytocin sources support two main research workflows: (1) social-behavior and pair-bonding research in rodent models (intranasal or central administration), where the bulk active is needed for preparation of dosing solutions outside the volume-constraint of finished-drug ampoules, and (2) smooth-muscle and reproductive-tissue research in isolated organ-bath or cell-culture contexts. For both workflows, the analytical packet emphasis is on confirming the cyclized active form and endotoxin testing (LAL) on the specific batch for in vivo work. Buyers seeking the finished pharmaceutical product (rather than bulk active for research) should reference their local regulator-approved oxytocin preparation; Peprimo supplies bulk active strictly for Research Use Only.
