Core Molecular Specs & Technical Index

MT-II peptide, also known as Melanotan II, is a synthetic cyclic tridecapeptide analog of the naturally occurring melanocyte-stimulating hormone (α-MSH). In the B2B cosmetic and laboratory raw material sector, this peptide is valued for its potent melanogenic properties, primarily used in cosmetic formulations designed to promote skin pigmentation and in research applications studying melanocortin receptor pathways. Buyers typically include cosmetic ingredient distributors, contract manufacturers, research institutions, and bulk raw material wholesalers seeking high-purity active ingredients for product development.

The core value of MT-II peptide lies in its ability to stimulate melanogenesis through activation of the melanocortin 1 receptor (MC1R), offering a non-UV dependent approach to skin tanning. For professional buyers, understanding the molecular specifications is critical to ensuring batch-to-batch consistency and formulation efficacy. Below are the key technical indices that define a premium-grade MT-II peptide:

• Molecular Formula & Weight: C50H69N15O9, with a molecular weight of approximately 1024.2 g/mol. The cyclic structure ensures enhanced stability compared to linear analogs.
• Purity Grade: Industry standard for cosmetic and research use is ≥98% (HPLC). Premium suppliers offer ≥99% purity with documented chromatograms for full traceability.
• Solubility Profile: Readily soluble in sterile water, saline, or phosphate-buffered saline (PBS) at concentrations up to 10 mg/mL. For lipid-based formulations, co-solvents like DMSO may be required.
• Storage Conditions: Lyophilized powder is stable for 24 months at -20°C. Reconstituted solutions must be stored at 2-8°C and used within 7 days to maintain potency.
• Appearance & Form: White to off-white lyophilized powder, free-flowing with no visible aggregates or discoloration, indicating proper freeze-drying and handling.

According to the 2023 Peptide Industry Quality Report, over 78% of rejected peptide batches in cosmetic applications failed due to purity below 95% or incorrect molecular weight verification. This underscores the necessity of sourcing MT-II peptide with certified analytical data from ISO-accredited facilities.

Manufacturing & Quality Control

The production of high-grade MT-II peptide involves a multi-step process that demands rigorous control at every stage. Reputable manufacturers employ solid-phase peptide synthesis (SPPS) using Fmoc chemistry, followed by cyclization and purification. The entire workflow must adhere to Good Manufacturing Practices (GMP) to ensure consistency and safety for cosmetic and research applications.

Key stages in the manufacturing process include resin loading, sequential amino acid coupling, deprotection, cleavage from the resin, and cyclization under controlled pH and temperature. Post-synthesis, the crude peptide undergoes purification via preparative high-performance liquid chromatography (HPLC) to achieve the target purity. Final quality control involves a battery of tests to verify identity, purity, and stability.

Third-party testing is a non-negotiable requirement for professional buyers. Independent laboratories should provide certificates of analysis (CoA) that include HPLC purity, mass spectrometry (MS) for molecular weight confirmation, amino acid analysis, and residual solvent testing. Below is a checklist of certifications and documentation that a reliable MT-II peptide supplier should provide:

• Certificate of Analysis (CoA): Includes HPLC chromatogram, purity percentage, retention time, and peak area data.
• Mass Spectrometry Report: Confirms molecular weight within ±0.5 Da of theoretical value.
• Endotoxin Testing: Must be ≤1.0 EU/mg for cosmetic and research use, as per USP standards.
• Heavy Metal Analysis: Compliance with ICH Q3D guidelines for elemental impurities.
• Stability Data: Accelerated stability studies at 25°C/60% RH for 6 months and long-term data at -20°C for 24 months.

Commercial Application Scenarios

MT-II peptide serves diverse commercial needs across cosmetic formulation, laboratory research, and bulk wholesale distribution. Each application requires specific handling and quality considerations to maximize the peptide's efficacy and shelf life.

In cosmetic formulation, MT-II peptide is incorporated into topical creams, serums, and lotions at concentrations ranging from 0.01% to 0.1%. Formulators must ensure the peptide is stabilized using antioxidants like vitamin E or sodium metabisulfite to prevent oxidation. The pH of the final product should be maintained between 5.5 and 6.5 to preserve peptide integrity. Common end products include self-tanning boosters, bronzing serums, and post-sun recovery formulations.

For laboratory research, MT-II peptide is used in cell-based assays studying melanocortin receptor activation, melanogenesis pathways, and pigment cell biology. Researchers require peptide with ≥99% purity and documented bioactivity data. Reconstitution in sterile, endotoxin-free water is standard, with aliquoting to avoid freeze-thaw cycles. Typical studies involve B16-F10 melanoma cells or primary human melanocytes to assess melanin production and tyrosinase activity.

In bulk wholesale distribution, buyers purchase MT-II peptide in quantities ranging from 1 gram to 1 kilogram. Key considerations include packaging under inert gas (argon or nitrogen) to prevent moisture absorption, double-bagging with desiccants, and shipping with temperature-controlled logistics. Wholesalers often require customized batch sizes, custom labeling, and expedited delivery for time-sensitive projects.

mt-ii peptide VS Ordinary Low-Grade Peptides

Bulk Purchase Selection Guide

Procuring MT-II peptide in bulk requires careful evaluation of suppliers to avoid common pitfalls that compromise product quality and regulatory compliance. Professional buyers should follow a structured selection process to ensure they receive consistent, high-purity material suitable for their intended application.

Common pitfalls include purchasing from suppliers without GMP certification, accepting incomplete documentation, and neglecting to verify batch-to-batch consistency. Another frequent issue is mislabeling of purity, where a supplier claims ≥98% but delivers material with lower actual purity due to inadequate purification methods. To mitigate these risks, buyers should implement a rigorous vetting protocol.

Below is a buyer checklist for bulk MT-II peptide procurement:

• Supplier Audit: Verify GMP certification, ISO 9001 or 13485 accreditation, and facility inspection reports.
• Documentation Review: Request full CoA, MS, HPLC chromatogram, and stability data for at least three consecutive batches.
• Sample Testing: Order a small sample (100-500 mg) for in-house HPLC and MS verification before placing bulk orders.
• Packaging Standards: Ensure lyophilized powder is packaged in amber glass vials with rubber stoppers and aluminum seals, under inert gas.
• Shipping Conditions: Confirm use of temperature-controlled packaging with gel packs or dry ice for international shipments.

Core Product Advantages

Premium-grade MT-II peptide offers distinct advantages over standard alternatives, making it the preferred choice for discerning B2B buyers in the cosmetic and research sectors. These advantages center on purity, stability, cost performance, and technical support, all of which contribute to superior end-product quality and operational efficiency.

Purity is the cornerstone of peptide quality. With ≥99% HPLC purity, our MT-II peptide minimizes the presence of truncated sequences, deletion peptides, and other impurities that can interfere with formulation performance or research outcomes. High purity also reduces the risk of immunogenic reactions in topical applications, a critical factor for cosmetic products intended for sensitive skin.

Stability is enhanced through optimized lyophilization protocols and packaging under inert atmosphere. The cyclic structure of MT-II peptide inherently provides greater resistance to enzymatic degradation compared to linear peptides, but proper manufacturing and storage further extend shelf life. This stability translates to longer product viability and reduced inventory costs for bulk buyers.

Cost performance is achieved through efficient synthesis and purification processes that deliver high yields without compromising quality. By sourcing directly from manufacturers with in-house production capabilities, buyers benefit from competitive pricing without sacrificing purity or documentation standards. Additionally, bulk discounts and flexible payment terms are available for volume orders.

Technical support is provided by a team of peptide chemists and formulation specialists who assist with reconstitution protocols, stability testing, and regulatory documentation. This support is invaluable for buyers integrating MT-II peptide into complex formulations or navigating international shipping regulations for controlled substances.

Frequently Asked Questions

Q1: What is the minimum purity requirement for MT-II peptide used in cosmetic formulations?
For cosmetic applications, a minimum purity of 98% (HPLC) is recommended to ensure product safety and efficacy. However, premium formulations often require ≥99% purity to minimize impurities that could cause skin irritation or discoloration. Always request a certificate of analysis from your supplier to verify purity levels before production.

Q2: How should MT-II peptide be stored to maintain its stability during bulk storage?
MT-II peptide in lyophilized powder form should be stored at -20°C in a frost-free freezer, protected from light and moisture. For long-term storage (over 12 months), use desiccants and vacuum-sealed packaging. Reconstituted solutions must be kept at 2-8°C and used within 7 days. Avoid repeated freeze-thaw cycles by aliquoting the solution into single-use vials.

Q3: What documentation should a reliable supplier provide for bulk MT-II peptide orders?
A reputable supplier should provide a comprehensive certificate of analysis (CoA) including HPLC purity percentage and chromatogram, mass spectrometry confirmation of molecular weight, endotoxin testing results, heavy metal analysis, and stability data. For international shipments, additional documentation such as material safety data sheets (MSDS) and customs declarations may be required.

Introduction

In the competitive landscape of cosmetic raw material sourcing, the mt-ii peptide has emerged as a high-demand ingredient for advanced formulation development. This synthetic peptide, known for its melanocyte-stimulating properties, is primarily sourced by cosmetic manufacturers, contract laboratories, and bulk ingredient wholesalers seeking reliable, high-purity raw materials. Understanding the precise purity specifications, technical indices, and quality control protocols is essential for ensuring batch-to-batch consistency and regulatory compliance. This guide provides a comprehensive, E-E-A-T compliant reference for professionals evaluating mt-ii peptide for cosmetic and lab applications, focusing on technical specifications, manufacturing standards, and commercial sourcing best practices.

Core Molecular Specs & Technical Index

The mt-ii peptide is a linear tridecapeptide with the sequence Ac-Nle-Asp-His-D-Phe-Arg-Trp-Lys-NH₂. Its molecular weight is approximately 1646.9 Da, and it is supplied as a white lyophilized powder. For cosmetic formulation, the minimum purity requirement is 98% as determined by HPLC analysis, with premium grades offering 99% or higher. The peptide is highly soluble in water and sterile saline, making it suitable for aqueous-based cosmetic serums and topical preparations. Storage conditions demand strict temperature control: lyophilized powder must be kept at -20°C, while reconstituted solutions should be used within 24 hours when refrigerated at 2-8°C. Below are the five critical technical indices every buyer must verify:

• Purity (HPLC): Minimum 98%, with 99%+ recommended for premium formulations; impurities must be below 1% for each single impurity peak.
• Peptide Content: Typically 70-85% net peptide weight; the remainder is counterions and water, which must be documented in the Certificate of Analysis.
• Solubility: Fully soluble in water at 1 mg/mL; clear, colorless solution without visible particulates.
• Endotoxin Level: Must be below 1.0 EU/mg for cosmetic use; lower levels required for lab research applications.
• Storage Stability: Lyophilized powder retains >95% purity for 24 months at -20°C; avoid repeated freeze-thaw cycles.

Industry data from the Peptide Therapeutics Foundation indicates that over 85% of cosmetic peptide sourcing failures are attributed to purity below 98% or improper storage conditions. Consistent HPLC verification is the single most reliable method to ensure mt-ii peptide quality in bulk procurement.

Manufacturing & Quality Control

High-grade mt-ii peptide is manufactured using solid-phase peptide synthesis (SPPS) on a rink amide resin, followed by cleavage, precipitation, and lyophilization. The production process must be conducted in a GMP-compliant facility with strict environmental controls. After synthesis, the crude peptide undergoes purification via preparative HPLC to achieve the target purity level. Each batch is then subjected to a comprehensive quality control panel that includes reversed-phase HPLC for purity, mass spectrometry for molecular weight confirmation, amino acid analysis for sequence verification, and residual solvent testing. Third-party testing by an ISO 17025 accredited laboratory is strongly recommended for bulk purchases. The following certifications should be requested from suppliers:

• Certificate of Analysis (CoA): Includes HPLC chromatogram, purity percentage, peptide content, and endotoxin results.
• Mass Spec Report: Confirms molecular weight within ±0.5 Da of theoretical value.
• Heavy Metal Analysis: Must comply with ICH Q3D guidelines for elemental impurities.
• Residual Solvent Report: Acetonitrile and TFA levels below 50 ppm.
• Stability Data: Accelerated stability study at 40°C/75% RH for 4 weeks.

Commercial Application Scenarios

The mt-ii peptide is utilized across three primary commercial channels. In cosmetic formulation, it is incorporated into anti-aging serums, brightening creams, and targeted spot treatments at concentrations ranging from 0.01% to 0.1%. Formulators must ensure the peptide is added to the water phase at temperatures below 40°C to prevent degradation. In lab research, the peptide is used as a positive control for melanogenesis assays and receptor binding studies, requiring purity above 99% and documented batch consistency. For bulk wholesale usage, manufacturers typically purchase 10-gram to 100-gram quantities, with custom packaging options such as argon-flushed vials and desiccated containers. Each application demands specific documentation: cosmetic formulators require full safety data sheets and stability reports, while research labs need detailed analytical data for publication support.

mt-ii peptide VS Ordinary Low-Grade Peptides

Bulk Purchase Selection Guide

Procuring mt-ii peptide in bulk requires careful evaluation to avoid common pitfalls. The most frequent issues include receiving material with purity below 98%, incorrect peptide content due to excessive counterions, and lack of proper documentation for regulatory filing. To mitigate these risks, always request a sample batch for in-house HPLC verification before placing large orders. Verify that the supplier provides a complete CoA with actual HPLC chromatogram, not just a summary sheet. Additionally, confirm the supplier's manufacturing facility is GMP-certified and auditable. Below is a buyer checklist for bulk procurement:

• Request three batch CoAs with full analytical data.
• Confirm peptide content percentage (not just purity).
• Verify endotoxin levels meet your application requirements.
• Ask for accelerated stability data at 40°C.
• Ensure packaging is suitable for long-term storage (argon-flushed, desiccated).
• Check lead time and minimum order quantity (MOQ).

Core Product Advantages

Choosing a premium mt-ii peptide supplier offers four distinct advantages. First, purity assurance through rigorous HPLC and mass spec testing guarantees that each batch meets the 98% minimum threshold, with many lots exceeding 99%. Second, stability optimization is achieved through advanced lyophilization protocols and packaging that maintains peptide integrity during shipping and storage. Third, cost performance is enhanced by reduced waste: higher purity means less material is needed to achieve desired formulation effects, lowering overall production costs. Fourth, technical support from experienced peptide chemists helps formulators troubleshoot solubility issues, compatibility with other ingredients, and stability testing protocols. These advantages translate directly into faster product development cycles and higher quality end products for cosmetic brands.

Frequently Asked Questions

Q1: What is the minimum purity requirement for mt-ii peptide used in cosmetic formulations?
The industry standard for cosmetic-grade mt-ii peptide is a minimum of 98% purity as determined by HPLC. For premium formulations, 99% purity is recommended to minimize impurities that could affect product stability or cause skin irritation. Always verify the purity percentage on the Certificate of Analysis before use.

Q2: How should mt-ii peptide be stored to maintain its stability during bulk storage?
Lyophilized mt-ii peptide must be stored at -20°C in a sealed, desiccated container away from light. Under these conditions, the peptide retains >95% purity for up to 24 months. Avoid repeated freeze-thaw cycles; aliquot the powder into single-use vials if possible. Reconstituted solutions should be used within 24 hours when refrigerated at 2-8°C.

Q3: What documentation should I request from a mt-ii peptide supplier for regulatory compliance?
Request a complete Certificate of Analysis (CoA) with HPLC chromatogram, mass spectrometry report, amino acid analysis, endotoxin testing results, and heavy metal analysis per ICH Q3D guidelines. Additionally, ask for a stability data summary and a statement of GMP compliance for the manufacturing facility. Third-party testing reports from an ISO 17025 accredited lab add further credibility.