Buy Melanotan II — USA-Made, COA per Lot
PX1 Research supplies analytical-grade Melanotan II (MT-2) synthesized in domestic, GMP-compliant facilities for rigorous preclinical and in vitro investigation. Every batch undergoes comprehensive analytical verification, including HPLC purity assessment, mass spectrometry structural confirmation, and endotoxin screening. Acquire reference-standard compounds with guaranteed lot-specific documentation and same-day dispatch from our California and Arizona logistics centers.
Quick answer
PX1 Research supplies analytical-grade Melanotan II (MT-2) synthesized in domestic, GMP-compliant facilities for rigorous preclinical and in vitro investigation. Every batch undergoes comprehensive analytical verification, including HPLC purity assessment, mass spectrometry structural confirmation, and endotoxin screening. Acquire reference-standard compounds with guaranteed lot-specific documentation and same-day dispatch from our California and Arizona logistics centers.
Key takeaways
- [Melanotan](/research-peptides/melanotan-2) II (CAS 121062-08-6) is a synthetic, cyclic heptapeptide analog of endogenous alpha-melanocyte-stimulating hormone (α-MSH).
- [Melanotan](/research-peptides/melanotan-2) II functions as a non-selective agonist across multiple sub-types of the melanocortin receptor family, demonstrating high affinity for MC1R, MC3R, MC4R, and MC5R.
- Quantitative integrity is essential when acquiring research materials.
- Laboratory procurement departments frequently face challenges when evaluating overseas peptide manufacturers.
Introduction to Melanotan II in Preclinical Research
Melanotan II (CAS 121062-08-6) is a synthetic, cyclic heptapeptide analog of endogenous alpha-melanocyte-stimulating hormone (α-MSH). Engineered to exhibit significantly higher metabolic stability and receptor affinity than native peptides, Melanotan II serves as a vital tool in laboratory settings investigating receptor kinetics, intracellular signal transduction, and melanogenesis pathways.
When principal investigators seek to buy Melanotan II for laboratory protocols, chemical fidelity and batch uniformity are paramount. Unrefined or impure peptide preparations introduce uncontrolled variables that invalidate assay results, alter binding kinetics, or cause cell toxicity in cell culture models. PX1 Research delivers analytical-grade compounds synthesized strictly for laboratory research use, providing researchers with reliable tools for reproducible experimentation.
Pharmacological Mechanism and Melanocortin Receptor Dynamics
Melanotan II functions as a non-selective agonist across multiple sub-types of the melanocortin receptor family, demonstrating high affinity for MC1R, MC3R, MC4R, and MC5R. In vitro binding studies indicate that its cyclic architecture—specifically the Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2 structure—confers enzymatic resistance against ambient peptidases, dramatically extending its half-life relative to linear α-MSH.
Preclinical research focused on melanogenesis indicates that activation of the MC1R receptor on cutaneous melanocytes triggers a signal transduction cascade mediated by cyclic adenosine monophosphate (cAMP). This upregulation activates microphthalmia-associated transcription factor (MITF), driving the downstream transcription of tyrosinase and tyrosinase-related proteins. In laboratory models, these pathways govern the enzymatic synthesis of eumelanin, shedding light on the molecular mechanisms of skin pigmentation responses to peptide stimuli. To explore related signaling pathways, researchers can reference compounds within our preclinical peptide library.
Analytical Rigor: HPLC, Mass Spectrometry, and Quality Benchmarks
Quantitative integrity is essential when acquiring research materials. Low-tier peptide vendors often rely on generalized, single-run certificates that fail to reflect the actual batch shipped to the laboratory. PX1 Research sets an industry benchmark by conducting independent HPLC and Mass Spectrometry validation for every individual manufacturing lot.
High-Performance Liquid Chromatography (HPLC) verifies that chemical purity consistently meets or exceeds 98–99%, ensuring the absence of truncated sequences, deletion peptides, or residual protecting groups. Concurrently, Electrospray Ionization Mass Spectrometry (ESI-MS) confirms the exact molecular weight (1024.2 g/mol), verifying sequence identity. Every order fulfilled by PX1 includes a lot-specific Certificate of Analysis (COA) directly linked to the physical vial delivered to your facility.
Comparative Analysis: USA-Synthesized Quality vs. Overseas Bulk Suppliers
Laboratory procurement departments frequently face challenges when evaluating overseas peptide manufacturers. While foreign suppliers offer low initial costs, overseas materials often suffer from significant batch-to-batch variation, unreacted synthesis reagents, heavy metal contamination, and incomplete lyophilization.
A primary concern with overseas imports is the presence of high residual trifluoroacetic acid (TFA) salts and uncontrolled bacterial endotoxins. Excess TFA left over from cleavage protocols alters buffer pH during reconstitution, leading to cellular toxicity in sensitive in vitro bioassays. PX1 Research synthesizes all compounds domestically in ISO 17025 accredited and GMP-compliant facilities. By adhering to strict solid-phase peptide synthesis (SPPS) controls and domestic purification standards, PX1 eliminates the chemical inconsistencies common in foreign supply chains.
Endotoxin Control and Bioburden Testing in Reagent Preparation
Endotoxins—lipopolysaccharides (LPS) derived from the outer membrane of Gram-negative bacteria—pose a subtle yet destructive threat to cell culture assays and physiological animal models. Contaminating endotoxins induce baseline inflammatory responses, masking true experimental signal and generating false-positive biochemical cascades.
PX1 Research subjects all peptide lots to standardized Chromogenic Recombinant Factor C (rFC) or Limulus Amebocyte Lysate (LAL) assays to guarantee endotoxin levels remain strictly below threshold limits (<0.01 EU/μg). This rigorous screening ensures that when laboratories purchase melanocortin receptor agonists from PX1, the observed bioactivity is attributable solely to the target sequence and not to pyrogenic bioburden.
Comparative Class Analysis: Melanotan II vs. Related Melanocortin Ligands
Within melanocortin receptor research, selecting the appropriate ligand depends entirely on the target sub-receptor profile and desired experimental endpoints. Melanotan II represents a potent, non-selective cyclic analog designed for broad receptor engagement.
When comparing Melanotan II to structural analogs, Melanotan I (Afamelanotide) exhibits a linear structure with enhanced selectivity for MC1R, making it a primary candidate when researchers wish to isolate melanogenic activity without activating central nervous system pathways. Conversely, PT-141 (Bremelanotide) is a metabolite derivative of Melanotan II that selectively targets central MC3R and MC4R receptors, frequently utilized in studies investigating neuro-endocrine behavior. Additionally, tripeptide fragments like KPV peptide interact with melanocortin signaling to mediate downstream anti-inflammatory pathways without driving pigment synthesis. Evaluating these distinct pharmacological profiles allows research teams to select the exact reference material required for their experimental design.
Reconstitution Protocols and Laboratory Handling
Proper reconstitution is critical to maintaining peptide structural stability and preventing aggregation. Lyophilized Melanotan II should be reconstituted inside a laminar flow hood using sterile technique. Laboratory protocols typically recommend using sterile bacteriostatic water containing 0.9% benzyl alcohol as a preservative to prevent microbial growth during multi-use sampling.
To reconstitute, slowly inject the diluent along the inner glass wall of the vial, allowing the solvent to trickle onto the lyophilized cake. Gentle swirl mixing should be employed; aggressive vortexing or vigorous shaking must be avoided, as mechanical shear forces can disrupt secondary peptide structure or induce denaturation. Following complete dissolution, aliquots should be prepared to prevent repeated thermal cycling.
Chemical Stability, Storage Parameters, and Degradation Pathways
In its lyophilized state, Melanotan II maintains high chemical stability when stored at -20°C in a desiccated environment away from direct light. Under these conditions, the peptide remains stable for extended periods without significant degradation or hydrolytic cleavage.
Once reconstituted into aqueous solution, the peptide's shelf life decreases. Reconstituted solutions should be stored at 2°C to 8°C and utilized within 30 days. For long-term liquid storage, aliquoting into single-use polypropylene microtubes and storing at -80°C prevents degradation; however, repeated freeze-thaw cycles must be rigorously avoided as ice crystal formation accelerates peptide chain cleavage.
Sourcing Laboratory-Grade Peptides: The PX1 Supply Advantage
Securing a dependable supply chain is essential for long-term institutional research projects. PX1 Research operates state-of-the-art fulfillment facilities in California and Arizona, allowing us to offer same-day shipping on orders placed Monday through Friday before 3:00 PM EST.
All materials are packaged in temperature-controlled, shock-absorbent containers to protect structural integrity during transit. Principal investigators and procurement managers managing high-throughput facilities can access volume-tier procurement and customized bulk production through our dedicated institutional wholesale portal. Choose PX1 Research as your verified domestic supply partner to ensure absolute consistency across every phase of scientific investigation.
Frequently Asked Questions
How does PX1 Research verify the purity of Melanotan II?
Every lot of Melanotan II synthesized for PX1 Research undergoes dual-method analytical verification using High-Performance Liquid Chromatography (HPLC) to establish chemical purity (>98-99%) and Electrospray Ionization Mass Spectrometry (ESI-MS) to verify precise molecular identity.
What is the specific target mechanism of Melanotan II in preclinical research?
Melanotan II is a non-selective melanocortin receptor agonist (acting upon MC1R, MC3R, MC4R, and MC5R). In preclinical research, it is primarily studied for its capacity to stimulate cAMP signaling cascades in melanocytes, influencing tyrosinase activity and cutaneous melanogenesis.
How does Melanotan II differ structurally from Melanotan I?
Melanotan II is a short, cyclic lactam-bridged heptapeptide (Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2), whereas Melanotan I (Afamelanotide) is a linear tridecapeptide analog of α-MSH. The cyclic structure of Melanotan II imparts greater enzymatic stability and a broader receptor binding profile.
Why is endotoxin testing critical for research-grade peptides?
Bacterial endotoxins (LPS) cause cellular toxicity and uncontrolled immune responses in in vitro and in vivo models. PX1 tests every lot via rFC/LAL assays to confirm endotoxin levels remain strictly under <0.01 EU/μg, ensuring baseline assay purity.
What solvent should be used to reconstitute lyophilized Melanotan II?
For standard laboratory applications, reconstitution with laboratory-grade sterile bacteriostatic water (0.9% benzyl alcohol) or sterile normal saline (0.9% NaCl) under aseptic conditions inside a laminar flow cabinet is recommended.
What are the recommended storage parameters for unopened vials?
Unopened, lyophilized vials should be stored at -20°C in a dry, dark environment. Under these desiccated conditions, the compound remains stable for up to 24 months.
Where does PX1 Research ship Melanotan II from?
PX1 Research ships all orders directly from domestic fulfillment hubs located in California and Arizona. Orders placed prior to 3:00 PM EST Monday through Friday ship the same day.
Is Melanotan II supplied by PX1 intended for human consumption?
No. All products supplied by PX1 Research are strictly engineered and sold for laboratory in vitro and preclinical research use only. They are not intended for human or animal therapeutic, diagnostic, or clinical application.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.