Oxytocin is a synthetic, high-purity representation of the endogenous cyclic nonapeptide hormone originally identified for its roles in reproductive biology and smooth muscle activation. Synthesized primarily within the magnocellular neurosecretory cells of the paraventricular and supraoptic nuclei of the hypothalamus, oxytocin is subsequently transported to the posterior pituitary gland for systemic secretion or released directly into central brain structures to act as a neuromodulator.

Chemically defined as a nine-amino-acid peptide featuring a critical intramolecular disulfide bridge between two cysteine residues, oxytocin acts as a selective agonist at the oxytocin receptor (OXTR). The peptide plays an indispensable role in neuroendocrinology, behavioral neuroscience, reproductive physiology, cardiovascular dynamics, and metabolic homeostasis.

Supplied as a stable, lyophilized powder at  analytical purity, this 10 mg presentation provides an essential research tool for in vitro, ex vivo, and preclinical laboratory studies investigating G-protein coupled receptor (GPCR) cascades, social neurobiology, autonomic regulation, and cross-system neuroimmune interactions.

Molecular Structure & Biochemical Architecture

The structural integrity of oxytocin is defined by its primary sequence and a specific tertiary fold stabilized by a covalent linkage:

1. The Cyclic Core & Disulfide Bridge

Residues 1 through 6 form a rigid, six-amino-acid ring closed by an intramolecular disulfide bond (-S-S-) between  and Cys1 and Cys6. This cyclic conformation is strictly required for high-affinity receptor recognition and activation at the  binding pocket. Reduction of this disulfide bridge to free sulfhydryl groups abolishes its biological activity.

2. The Linear C-Terminal Tripeptide Tail

Residues 7 through 9 (Pro-Leu-Gly-NH2) extend from the cyclic core as an amidated linear tail. This region stabilizes the bioactive conformation and participates in binding interactions with the extracellular loops of the target receptor.

3. C-Terminal Amidation (-NH2)

The terminal glycine residue is amidated, mimicking the post-translational modification performed by peptidylglycine -amidating monooxygenase (PAM) in endogenous synthesis. This modification neutralizes negative terminal charges, protecting the peptide against carboxypeptidase degradation and preserving binding kinetics.

Receptor Signaling & Mechanism of Action

Oxytocin exerts its physiological effects almost exclusively through the oxytocin receptor (OXTR), a Class A Rhodopsin-like G-protein coupled receptor (GPCR). OXTR is widely distributed throughout central brain regions (amygdaloid complex, ventromedial hypothalamus, nucleus accumbens, hippocampus) and peripheral tissues (uterine myometrium, mammary myoepithelium, myocardium, vascular endothelium, and immune cells).

Upon ligand binding,  engages distinct intracellular signaling pathways depending on the tissue type and functional G-protein coupling:

• Gαq/11 Phospholipase Cβ(PLCβ)Pathway: Primary activation of  stimulates , hydrolyzing phosphatidylinositol 4,5-bisphosphate () into inositol 1,4,5-trisphosphate () and diacylglycerol ().  triggers rapid calcium () efflux from the sarcoplasmic/endoplasmic reticulum into the cytosol. Elevated intracellular calcium complexes with calmodulin to activate myosin light chain kinase (), driving smooth muscle contraction in uterine and mammary tissue.

• Protein Kinase C (PKC) & Extracellular Signal-Regulated Kinase (ERK) Pathways: Simultaneously,  activates , initiating downstream  signaling cascades. In neuronal and cardiac tissues, this pathway modulates gene transcription, cell survival, synaptic remodeling, and long-term potentiation (LTP).

• Gαi/o Coupling: In specific central neuronal populations,  can couple to  sub-types, inhibiting adenylyl cyclase activity and reducing intracellular cyclic  AMP(cAMP) levels to modulate neuronal excitability and neurotransmitter release.

Primary Laboratory Research Domains

1. Social & Behavioral Neuroscience

Oxytocin is a principal experimental model for investigating the neurobiology of social cognition and emotional regulation. Researchers study central oxytocin transmission in animal models to evaluate:

• Social Recognition & Memory: How oxytocin signaling in the medial amygdala and hippocampus modulates social habituation and partner discrimination.

• Pair Bonding & Attachment: The neural mechanisms in the nucleus accumbens and ventral striatum where oxytocin interacts with dopaminergic (D2) signaling to establish social preferences.

• Anxiolysis & Stress Adaptation: Attenuation of hypothalamic-pituitary-adrenal (HPA) axis reactivity by suppressing corticotropin-releasing hormone (CRH) release in the paraventricular nucleus.

2. Reproductive Physiology & Smooth Muscle Kinetics

In smooth muscle dynamics, oxytocin serves as the primary benchmark for studying receptor-mediated mechanical tension generation. Ex vivo tissue baths and cell models utilize oxytocin to examine:

• Uterine Myometrium Dynamics: Estrogen-dependent upregulation of  density and gap junction formation (Connexin-43) during labor induction models.

• Mammary Myoepithelium: Milk ejection reflex dynamics via rapid myoepithelial contraction surrounding alveolar structures.

3. Cardiovascular Physiology & Metabolic Homeostasis

Modern research highlights oxytocin's role beyond neuroendocrinology, examining its cardioprotective and metabolic regulatory properties:

• Cardioprotection: Stimulation of atrial natriuretic peptide (ANP) release from cardiomyocytes, aiding blood pressure regulation, anti-inflammatory cascades, and post-ischemic tissue repair.

• Energy Balance: Central administration models demonstrate reduced high-fat food intake, improved peripheral insulin sensitivity, and enhanced lipolysis in adipose tissue.

4. Neuroimmune Interactions & Tissue Repair

Oxytocin receptors expressed on macrophages, neutrophils, and lymphocytes modulate local inflammatory cascades. Research protocols evaluate oxytocin's capacity to downregulate pro-inflammatory cytokines (TNF-α, IL-1β, IL-6), reduce oxidative stress, and accelerate cutaneous and mucosal wound healing models.

Technical Specifications & Analytical Parameters

• Chemical Name: Oxytocin

• Sequence Format:  (Disulfide bridge: 1  6)

• CAS Registry Number: 50-56-6

• Molecular Formula: C43H66N12O12S2

• Molecular Weight: 1,007.19 g/mol

• Purity Level:  (Verified by RP-HPLC)

• Identity Verification: Mass Spectrometry (ESI-MS) & High-Performance Liquid Chromatography (HPLC)

• Physical Appearance: Lyophilized, white to off-white cake/powder

• Net Quantity: 10.0 mg per serum vial

• Solubility Profile: Highly soluble in sterile water, saline, or buffered aqueous media ()

• Recommended Storage: Store at  (desiccated, dark environment)

• Lyophilized Shelf Life:  under specified frozen conditions

Product Quality & Handling

• Analytical Verification: Every batch undergoes Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) and Electrospray Ionization Mass Spectrometry (ESI-MS) to guarantee structural identity, correct disulfide linkage, and high purity.

• Lyophilized Format: Freeze-dried under nitrogen to preserve the sensitive disulfide bridge, ensuring stability during transport and storage before reconstitution.

Reconstitution Protocol

1. Equilibration: Allow frozen vials to adjust to ambient room temperature (20C-25C) prior to opening to prevent air humidity condensation on the lyophilized cake.

2. Reconstitution: Gently add sterile water,  sodium chloride, or phosphate-buffered saline (PBS, pH 7.4 ) along the inner glass wall of the vial.

3. Dissolution: Swirl the vial with a gentle circular motion until the peptide fully dissolves. Avoid vigorous shaking or vortexing, as mechanical shear stress can disrupt peptide tertiary structure and induce aggregation.

4. Storage: Aliquot reconstituted solutions into sterile polypropylene microcentrifuge tubes and store at  or  to avoid repeated freeze-thaw cycles. Reconstituted solutions stored at  should be used within 7 to 10 days.

Research Disclaimer: Oxytocin is supplied strictly for laboratory research, scientific evaluation, and in vitro or preclinical experimentation. It is not intended for human consumption, therapeutic administration, clinical diagnostic use, or veterinary applications. Handling must be restricted to qualified research personnel.

Oxytocin is a synthetic research peptide modeled after the endogenous cyclic nonapeptide hormone naturally produced within the hypothalamus and released through the posterior pituitary. Researchers investigate Oxytocin because of its important role in neuroendocrinology, social behavior, reproductive physiology, smooth-muscle signaling, cardiovascular biology, metabolic regulation, and neuroimmune communication.

Its distinctive cyclic structure, stabilized by a critical disulfide bridge, makes Oxytocin one of the most extensively studied neuropeptides in modern biological research.

As interest in neuroscience, behavioral biology, receptor pharmacology, and neuroendocrine signaling continues to grow, researchers frequently compare Oxytocin suppliers based on purity, analytical testing, manufacturing standards, pricing, and supplier transparency.

This Oxytocin Vendor Price Comparison Guide helps researchers evaluate suppliers using objective criteria including:

• Product Pricing

• Cost Per Milligram

• Product Purity

• Third-Party Testing

• Certificate of Analysis (COA)

• Vendor Reputation

• Customer Reviews

• Shipping Performance

• Product Availability

• Overall Value

Whether you're searching for the lowest-priced Oxytocin supplier, the highest-purity research-grade material, or vendors offering extensive analytical verification, this guide provides a framework for comparing peptide suppliers.

Explore Oxytocin Vendors by Criteria

Most Popular Oxytocin Vendors

Compare suppliers frequently selected by neuroscience and neuroendocrinology researchers.

Highest Reviewed Vendors

Discover peptide suppliers with strong customer satisfaction and positive marketplace reputations.

Lowest Price Vendors

Identify suppliers offering competitive pricing and favorable cost-per-milligram value.

Highest Purity Vendors

Review suppliers providing transparent purity verification and analytical testing.

Best Value Vendors

Compare pricing, analytical documentation, quality-control standards, and customer support.

Fastest Shipping Vendors

Evaluate fulfillment speed, packaging reliability, and delivery performance.

Newly Listed Vendors

Explore recently added suppliers offering Oxytocin research peptides.

What Is Oxytocin?

Overview

Oxytocin is a cyclic nonapeptide hormone that functions through the Oxytocin Receptor (OXTR), a G-protein-coupled receptor (GPCR) distributed throughout the central nervous system and numerous peripheral tissues.

Researchers investigate Oxytocin because of its relationship with:

• Neuroendocrine signaling

• Social behavior research

• Receptor pharmacology

• Neurotransmitter regulation

• Reproductive physiology

• Cardiovascular biology

• Metabolic homeostasis

• Neuroimmune communication

Its broad physiological relevance makes Oxytocin one of the most important peptides in modern research.

Molecular Characteristics

Peptide Information

Researchers evaluating Oxytocin products should carefully review analytical documentation and molecular specifications.

Peptide Name

Oxytocin

Classification

Cyclic Nonapeptide Hormone

Research Category

Neuroscience & Neuroendocrine Research

CAS Number

50-56-6

Molecular Formula

C43H66N12O12S2

Molecular Weight

1,007.19 g/mol

Peptide Length

9 Amino Acids

Structural Feature

Intramolecular Disulfide Bridge

Product Format

Lyophilized Powder

Typical Purity

≥98% RP-HPLC Verified

Why Researchers Study Oxytocin

Oxytocin has generated enormous scientific interest because of its involvement in both central nervous system signaling and peripheral physiological regulation.

Researchers investigate pathways involving:

• Social cognition

• Behavioral adaptation

• Neurotransmitter signaling

• Cellular communication

• Smooth-muscle physiology

• Neuroendocrine regulation

These mechanisms remain active areas of scientific investigation.

Molecular Structure & Biochemical Architecture

Cyclic Core Structure

One of the defining features of Oxytocin is its cyclic structure formed by a disulfide bond linking two cysteine residues.

Researchers investigate this structural feature because it contributes to:

• Receptor recognition

• Binding affinity

• Structural stability

• Biological activity

• Molecular signaling

This cyclic conformation is essential to Oxytocin research.

C-Terminal Amidation

Oxytocin naturally contains a C-terminal amidated glycine residue.

Researchers study this modification because it may influence:

• Peptide stability

• Receptor interactions

• Degradation resistance

• Molecular integrity

• Pharmacological properties

Oxytocin Receptor Research

OXTR Signaling

The primary focus of Oxytocin research involves activation of the Oxytocin Receptor (OXTR).

Researchers investigate pathways involving:

• GPCR signaling

• Cellular communication

• Hormonal regulation

• Receptor activation

• Signal transduction

This remains the central area of Oxytocin research.

Gαq/11 Signaling Research

Scientists continue examining pathways involving:

• Phospholipase C activation

• Intracellular calcium signaling

• Cellular responsiveness

• Signal amplification

• Physiological regulation

Further studies remain ongoing.

PKC & ERK Research

Researchers investigate pathways involving:

• Protein kinase signaling

• Gene-expression regulation

• Synaptic adaptation

• Cellular survival

• Molecular communication

Oxytocin & Social Neuroscience Research

Social Recognition Research

One of the most studied areas of Oxytocin biology involves social behavior.

Researchers investigate pathways involving:

• Social recognition

• Social memory

• Behavioral adaptation

• Neural communication

• Cognitive signaling

This remains one of the largest areas of investigation.

Attachment & Bonding Research

Scientists continue studying pathways involving:

• Social preference

• Reward-system signaling

• Behavioral regulation

• Neurobiological communication

• Cognitive adaptation

Further research remains active.

Stress & Resilience Research

Researchers examine pathways involving:

• Stress-response signaling

• Neuroendocrine regulation

• HPA-axis communication

• Behavioral adaptation

• Cellular resilience

Oxytocin & Cognitive Research

Memory Research

Researchers investigate Oxytocin because of its relationship with:

• Memory formation

• Neural communication

• Information processing

• Learning mechanisms

• Cognitive adaptation

Hippocampal Signaling Research

Scientists continue exploring:

• Synaptic communication

• Neuroplasticity

• Cellular signaling

• Long-term potentiation

• Brain-network adaptation

Oxytocin & Reproductive Physiology Research

Uterine Signaling Research

Researchers investigate pathways involving:

• Smooth-muscle contraction

• Cellular communication

• Tissue responsiveness

• Hormonal regulation

• Mechanical signaling

This remains a significant field of study.

Mammary Gland Research

Studies frequently examine pathways involving:

• Myoepithelial signaling

• Tissue communication

• Cellular activation

• Hormonal regulation

• Physiological adaptation

Oxytocin & Cardiovascular Research

Cardiovascular Signaling Research

Researchers investigate Oxytocin because of its relationship with cardiovascular physiology.

Research areas include:

• Cardiac communication

• Cellular signaling

• Tissue adaptation

• Vascular biology

• Physiological regulation

Cardiomyocyte Research

Scientists continue examining pathways involving:

• Cellular resilience

• Signal transduction

• Tissue maintenance

• Molecular adaptation

• Cardiovascular physiology

Vascular Research

Researchers investigate pathways involving:

• Endothelial signaling

• Vascular communication

• Tissue homeostasis

• Cellular regulation

• Physiological adaptation

Oxytocin & Metabolic Research

Energy Balance Research

Researchers continue studying pathways involving:

• Metabolic regulation

• Nutrient signaling

• Energy homeostasis

• Cellular adaptation

• Hormonal communication

Insulin Signaling Research

Studies examine relationships involving:

• Metabolic physiology

• Endocrine regulation

• Glucose biology

• Cellular metabolism

• Energy management

Lipid Metabolism Research

Scientists investigate pathways involving:

• Fat metabolism

• Cellular energy utilization

• Hormonal signaling

• Metabolic adaptation

• Nutrient regulation

Oxytocin & Neuroimmune Research

Immune Signaling Research

Researchers investigate Oxytocin because of its relationship with immune-system communication.

Research includes:

• Cytokine signaling

• Cellular communication

• Immune regulation

• Stress adaptation

• Tissue maintenance

Inflammatory Biology Research

Scientists continue studying pathways involving:

• Pro-inflammatory signaling

• Cellular responses

• Tissue adaptation

• Molecular regulation

• Homeostatic processes

Oxytocin & Tissue Repair Research

Wound-Healing Research

Researchers investigate pathways involving:

• Cellular migration

• Tissue remodeling

• Recovery mechanisms

• Structural organization

• Biological adaptation

Regenerative Biology Research

Studies continue examining:

• Cellular communication

• Tissue maintenance

• Repair-associated signaling

• Structural integrity

• Physiological resilience

Why Researchers Compare Oxytocin Vendors

Research reproducibility depends heavily on peptide quality and manufacturing consistency.

Differences among suppliers may include:

• Product purity

• Batch consistency

• Stability testing

• Manufacturing standards

• Analytical verification

• Product documentation

• Storage procedures

• Quality-control systems

Careful supplier evaluation helps improve reliability across laboratory studies.

How We Compare Oxytocin Vendors

Third-Party Laboratory Testing

Researchers should prioritize suppliers offering:

• Third-party testing

• Identity verification

• Purity analysis

• Batch-specific reports

• Structural confirmation

Certificate of Analysis (COA)

A quality COA should include:

• Batch number

• Testing date

• Purity percentage

• Identity verification

• Analytical methodology

Product Purity

Purity remains one of the most important variables when evaluating research peptides.

Higher-purity products generally contribute to improved experimental reproducibility.

Cost Per Milligram

Comparing vial prices alone may not accurately reflect value.

Cost Per Milligram Formula

Product Price ÷ Total Milligrams = Cost Per Milligram

This metric standardizes vendor comparisons.

Customer Reviews

Customer experiences often provide insight regarding:

• Product consistency

• Packaging quality

• Shipping reliability

• Customer support

• Purchasing experience

Vendor Reputation

Established peptide suppliers often demonstrate:

• Transparent testing programs

• Reliable analytical verification

• Positive customer feedback

• Consistent inventory availability

Quality & Analytical Testing

Why Testing Matters

Research-grade Oxytocin products should undergo testing to verify:

• Identity

• Purity

• Structural integrity

• Correct disulfide linkage

• Stability

• Batch consistency

Common Testing Methods

Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC)

Used to assess purity and identify impurities.

Electrospray Ionization Mass Spectrometry (ESI-MS)

Used to verify molecular identity and peptide composition.

Identity Verification

Confirms peptide authenticity and correct sequence.

Structural Characterization

Verifies proper molecular architecture and disulfide bonding.

Batch Consistency Analysis

Measures reproducibility across manufacturing lots.

Storage & Handling

Researchers should follow validated laboratory procedures.

Best practices include:

✅ Protect from moisture

✅ Protect from excessive heat

✅ Minimize light exposure

✅ Allow vial equilibration before reconstitution

✅ Avoid repeated freeze-thaw cycles

✅ Follow validated storage protocols

✅ Use sterile laboratory handling techniques

Proper handling helps maintain peptide integrity and stability.

Understanding Oxytocin Pricing

Several factors influence supplier pricing.

Product Purity

Higher-purity peptides typically command premium pricing.

Manufacturing Complexity

Cyclic peptides containing disulfide bridges require specialized synthesis and quality-control procedures.

Analytical Verification

Extensive testing programs improve transparency and increase manufacturing costs.

Research Demand

Growing interest in neuroscience, behavioral biology, and neuroendocrine research contributes to market demand.

Vendor Reputation

Established suppliers often charge more because of rigorous quality-assurance standards.

Oxytocin Vendor Evaluation Checklist

Quality Verification

✅ Third-party testing available

✅ Certificate of Analysis provided

✅ RP-HPLC purity documentation available

✅ Mass spectrometry verification available

✅ Identity confirmation documented

✅ Batch-specific reports available

✅ Stability testing available

Vendor Reliability

✅ Positive customer reviews

✅ Transparent company information

✅ Responsive customer support

✅ Reliable inventory availability

Purchasing Experience

✅ Secure checkout process

✅ Shipment tracking available

✅ Clear return policies

✅ Reliable order fulfillment

Frequently Asked Questions

What is Oxytocin?

Oxytocin is a cyclic nonapeptide hormone and neuropeptide that functions primarily through the Oxytocin Receptor (OXTR) and is extensively studied in neuroscience, neuroendocrinology, reproductive biology, and cardiovascular research.

What is Oxytocin used for in research?

Researchers investigate Oxytocin in studies involving social behavior, stress adaptation, receptor pharmacology, cognitive biology, smooth-muscle signaling, cardiovascular physiology, metabolic regulation, neuroimmune communication, and tissue repair.

What receptor does Oxytocin target?

Oxytocin primarily acts through the Oxytocin Receptor (OXTR), a Class A G-protein-coupled receptor (GPCR).

What should researchers review before purchasing?

Researchers should evaluate:

• Certificate of Analysis (COA)

• Third-party testing

• RP-HPLC purity verification

• Mass spectrometry confirmation

• Identity verification

• Vendor reputation

Why is analytical testing important?

Independent testing helps verify peptide identity, purity, structural integrity, proper disulfide bond formation, and batch consistency, improving research reproducibility.

Final Thoughts

Oxytocin remains one of the most important neuropeptides in modern scientific research because of its involvement in social neuroscience, neuroendocrine signaling, receptor pharmacology, reproductive physiology, cardiovascular biology, metabolic regulation, neuroimmune communication, and tissue-repair pathways. Ongoing investigations continue expanding scientific understanding of how Oxytocin influences cellular communication and physiological adaptation across multiple biological systems.

When comparing Oxytocin vendors, researchers should prioritize purity verification, third-party analytical testing, Certificate of Analysis availability, RP-HPLC validation, mass spectrometry confirmation, supplier reputation, and overall value rather than focusing exclusively on price. A structured vendor-comparison process can help identify suppliers capable of meeting rigorous research-quality standards.