Question 1

What types of peptides do you supply?

Accepted Answer

We supply over 496+ peptide APIs across 6 major categories: Cosmetic Peptides (190 products), Pharmaceutical Peptides (83 products), Nutrition Peptides (58 products), Sports and Fitness Peptides (50 products), Personal Care Peptides (62 products), and Pet Care Peptides (53 products). Our portfolio includes both catalog peptides and custom synthesis services.

Question 2

What is the difference between GHK, GHK-Cu and GHK-Cu Acetate?

Accepted Answer

GHK is the free tripeptide (Gly-His-Lys) without copper ions. GHK-Cu is the copper complex where GHK binds with a copper(II) ion, dramatically increasing its biological activity for skin regeneration and wound healing. GHK-Cu Acetate is the acetate salt form of GHK-Cu, offering improved stability and solubility for cosmetic and pharmaceutical formulations.

Question 3

What is the difference between raw powder and lyophilized powder?

Accepted Answer

Raw powder is the direct output after peptide synthesis and cleavage, containing residual solvents and moisture. Lyophilized (freeze-dried) powder undergoes a purification and drying process that removes solvents and water, resulting in higher purity, better stability, and longer shelf life. For most applications, we recommend lyophilized powder.

Question 4

What purity grades do you offer for peptide raw materials?

Accepted Answer

We specialize in 99% high-purity peptide raw materials across our entire portfolio. All products meet stringent quality standards with comprehensive COA documentation. Custom purity requirements can be discussed for specific projects.

Question 5

What salt forms are available for your peptides?

Accepted Answer

Our peptides are available in multiple salt forms including acetate salt, TFA (trifluoroacetate) salt, HCl salt, and free acid/base forms. Acetate salt is preferred for cosmetic and pharmaceutical applications due to better biocompatibility. TFA salt is standard for research-grade peptides.

Question 6

Do you offer custom peptide synthesis services?

Accepted Answer

Yes, we provide comprehensive custom peptide synthesis services from 50mg to kilogram scale. Our capabilities include standard linear peptides, cyclic peptides, modified peptides (PEGylation, fatty acid conjugation, fluorescent labeling), and peptides containing non-natural amino acids.

Question 7

What is the minimum order quantity (MOQ) for peptide raw materials?

Accepted Answer

Our standard MOQ is 50-100mg for most peptide APIs. For high-value peptides like Semaglutide and Tirzepatide, MOQ may be higher. We also offer sample orders starting from 10mg for qualified buyers. Contact us for specific product MOQ details. Contact us for specific product MOQ details.

Question 8

Can you provide peptides in different packaging specifications?

Accepted Answer

Yes, we offer flexible packaging options including glass vials (2mL, 5mL, 10mL), HDPE bottles, and bulk aluminum foil bags. Custom packaging with private labeling is available for qualified customers.

Question 9

How do you ensure the quality of your peptide products?

Accepted Answer

Our quality management system covers the entire supply chain. We have our own R&D laboratory and analytical testing equipment for incoming QC verification. All manufacturing partners are GMP-certified and undergo rigorous annual audits. Every batch is tested with HPLC, LC-MS, and other methods before release.

Question 10

What tests do you perform on each batch of peptides?

Accepted Answer

Each batch undergoes comprehensive testing including: HPLC purity analysis, LC-MS molecular weight confirmation, amino acid analysis (AAA), peptide content determination, residual TFA testing, water content (Karl Fischer), microbial testing, and endotoxin testing (LAL).

Question 11

Do you provide COA (Certificate of Analysis) for every batch?

Accepted Answer

Yes, every batch ships with a comprehensive COA that includes: product name, batch number, CAS number, test results (purity, MW, peptide content, water, TFA), testing methods, specification limits, testing date, and authorized signature.

Question 12

What does LC-MS test for in peptide analysis?

Accepted Answer

LC-MS (Liquid Chromatography-Mass Spectrometry) confirms the molecular weight and identity of the peptide. It detects potential impurities including deletion sequences, insertion sequences, and side-reaction products. LC-MS/MS can further sequence the peptide to verify the amino acid order.

Question 13

What is HPLC assay and why is it important for peptides?

Accepted Answer

HPLC (High Performance Liquid Chromatography) assay measures the purity of the peptide by separating it from impurities. It quantifies the main peak area percentage, which directly indicates purity. This is the industry standard method for peptide purity assessment and batch-to-batch consistency.

Question 14

How do you control heavy metal and microbial levels in peptides?

Accepted Answer

Heavy metals are controlled through ICP-MS testing (limit: less than 10ppm total, less than 1ppm for each heavy metal). Microbial levels are tested via total aerobic count, yeast and mold count, and specific pathogen screening (E. coli, Salmonella, S. aureus).

Question 15

Can you support third-party testing verification?

Accepted Answer

Yes, we fully support third-party testing. Customers can send samples to their preferred independent laboratories for verification. We also provide reference standards and testing protocols to facilitate third-party validation.

Question 16

What is the shelf life of your peptide raw materials?

Accepted Answer

Lyophilized peptides typically have a shelf life of 24-36 months when stored at -20°C in sealed containers with desiccant. Specific shelf life varies by peptide type and is indicated on each COA. Stability study data is available upon request.

Question 17

Are your peptides compliant with EU REACH regulations?

Accepted Answer

Yes, our peptides are REACH-compliant for EU market access. We provide full registration documentation, safety data sheets (SDS), and chemical safety reports as required by EU REACH regulation (EC) No 1907/2006.

Question 18

Do you have CPNP registration for cosmetic peptides?

Accepted Answer

We provide comprehensive technical documentation to support our customers CPNP (Cosmetic Products Notification Portal) registration in the EU, including safety assessments, ingredient specifications, and stability data.

Question 19

Are your peptide products FDA compliant for the US market?

Accepted Answer

Our manufacturing partners operate under FDA-inspected GMP facilities. We provide full documentation support for FDA compliance including DMF (Drug Master File) preparation assistance, IND-supporting data, and complete regulatory consultation.

Question 20

Do you have TGA registration for the Australian market?

Accepted Answer

We provide comprehensive regulatory documentation to support TGA (Therapeutic Goods Administration) applications in Australia, including GMP certificates, stability data, and complete CMC (Chemistry, Manufacturing, and Controls) packages.

Question 21

Can you provide MSDS/SDS for your peptide products?

Accepted Answer

Yes, we provide Safety Data Sheets (SDS/MSDS) for all peptide products. The SDS includes hazard identification, composition information, first-aid measures, handling and storage requirements, and regulatory information for safe transport and use.

Question 22

Are your peptides suitable for research use only (RUO)?

Accepted Answer

Many of our peptides are available as Research Use Only (RUO) grade. RUO peptides are clearly labeled and intended for laboratory research purposes only, not for human therapeutic, diagnostic, or cosmetic use without proper regulatory approval.

Question 23

Can you provide non-infringement statements for your peptides?

Accepted Answer

Yes, we can provide non-infringement declarations and freedom-to-operate (FTO) assessments for our peptide products. These documents are prepared in consultation with our legal team and are available upon request for qualified customers.

Question 24

What compliance documents do you provide for customs clearance?

Accepted Answer

We provide comprehensive export documentation including: Commercial Invoice, Packing List, Certificate of Origin, SDS/MSDS, COA, and any specific import permits or regulatory declarations required by the destination country.

Question 25

Do you offer peptide lyophilization production solutions?

Accepted Answer

Yes, we provide complete peptide lyophilization production solutions including: freeze dryer equipment supply, SOP protocol development, process optimization, technical training, and ongoing production support. Our solutions are scalable from lab-scale to commercial production.

Question 26

Can you help me set up a small peptide lyophilization lab?

Accepted Answer

Absolutely. We offer turn-key lab setup services including equipment selection and installation, SOP development, staff training, and ongoing technical support. We have helped numerous RUOs and CDMOs establish their peptide production capabilities from scratch.

Question 27

Do you provide lyophilization SOP and technical support?

Accepted Answer

Yes, we provide comprehensive lyophilization SOPs (Standard Operating Procedures) covering: sample preparation, freeze-dryer operation, cycle optimization, troubleshooting guides, and maintenance protocols. Our technical team provides ongoing remote and on-site support.

Question 28

What equipment do I need for small-batch peptide lyophilization?

Accepted Answer

For small-batch production (10-100 vials/batch), you typically need: a bench-top freeze dryer (-80°C condenser), peptide synthesizer (0.1-10mmol scale), preparative HPLC system, rotary evaporator, and basic analytical equipment (analytical balance, pH meter). We can provide equipment packages with installation and training.

Question 29

Can you help with peptide formulation development for cosmetics?

Accepted Answer

Yes, our technical team includes experienced formulation scientists who can assist with: solubility optimization, stability testing, preservative system selection, compatibility testing with other ingredients, and pilot batch production for cosmetic peptide formulations.

Question 30

Do you offer technical support for peptide product development?

Accepted Answer

Yes, we provide comprehensive technical support throughout your product development lifecycle including: consultation on peptide selection, formulation guidance, regulatory pathway advice, stability study design, and scale-up support from R&D to commercial production.

Question 31

Can you provide custom peptide manufacturing process optimization?

Accepted Answer

Yes, we offer process optimization services including: yield improvement, impurity profile reduction, cycle time reduction, cost optimization, and technology transfer support. Our team has deep expertise in SPPS and LPPS process development.

Question 32

Do you offer GMP-grade peptide production solutions?

Accepted Answer

Yes, we provide GMP-grade peptide raw materials sourced from our audited GMP-certified manufacturing partners. We offer full regulatory documentation support including DMF/CEP assistance, analytical method validation, and stability studies.

Question 33

How can I place an order for peptide raw materials?

Accepted Answer

You can place orders via email (jade.cheung@zhaokebio.com), through our website inquiry form, or by phone (+86 198 4267 3490). For first-time customers, we recommend starting with a sample order to evaluate product quality before placing bulk orders.

Question 34

What payment methods do you accept?

Accepted Answer

We accept bank wire transfer (T/T) as our primary payment method. For sample orders, we also accept Western Union and PayPal. Payment terms are negotiable for established customers.

Question 35

Do you accept sample orders for testing?

Accepted Answer

Yes, we offer sample orders starting from 10mg for qualified buyers. To qualify, please provide your company information and intended use. Sample pricing is competitive, and shipping costs are borne by the customer.

Question 36

Can I get a quotation for bulk peptide orders?

Accepted Answer

Yes, please contact us with your specific requirements (product name, CAS number, quantity, purity grade, and delivery destination). We typically provide quotations within 24 hours. Volume discounts are available for orders over 1 gram.

Question 37

Do you offer discounts for long-term cooperation customers?

Accepted Answer

Yes, we offer preferential pricing for long-term partners including: tiered volume discounts, annual contract pricing, priority production scheduling, and dedicated account management. Contact us to discuss a partnership agreement tailored to your needs.

Question 38

What is your typical lead time for peptide orders?

Accepted Answer

For in-stock catalog peptides: 3-7 business days. For custom synthesis: 2-4 weeks depending on sequence complexity and quantity. For large bulk orders (kg scale): 4-8 weeks. Specific lead times are confirmed at the time of quotation.

Question 39

Can I request a custom synthesis quote for a specific peptide?

Accepted Answer

Yes, please provide the peptide sequence, desired quantity, purity requirement, salt form preference, and any modifications needed. Our technical team will review your requirements and provide a detailed quotation including pricing, lead time, and proposed synthetic route within 48 hours.

Question 40

Do you ship peptides internationally?

Accepted Answer

Yes, we ship to over 80 countries worldwide including the EU, USA, Australia, Japan, South Korea, and Southeast Asia. We have extensive experience with international peptide shipping and customs clearance.

Question 41

Which countries do you ship to?

Accepted Answer

We ship globally to major markets including: United States, all EU countries, United Kingdom, Australia, Canada, Japan, South Korea, Singapore, Thailand, India, Brazil, and many others. Contact us if your country is not listed.

Question 42

How are peptides packaged for international shipping?

Accepted Answer

Peptides are packaged in vacuum-sealed vials with desiccant, placed in sturdy foam-insulated boxes with ice packs for temperature control. All packages are clearly labeled with proper shipping names, UN numbers, and hazard classifications as required by IATA regulations.

Question 43

Do you provide cold chain shipping for temperature-sensitive peptides?

Accepted Answer

Yes, for temperature-sensitive peptides we provide cold chain shipping with dry ice (-78°C) or gel packs (2-8°C) depending on product stability requirements. Temperature data loggers can be included upon request.

Question 44

How long does international shipping usually take?

Accepted Answer

Express shipping (DHL/FedEx): 3-7 business days to most destinations. Standard air freight: 7-14 business days. Sea freight: 30-45 days for bulk orders. Specific delivery times depend on destination and customs clearance speed.

Question 45

What if my package gets held at customs?

Accepted Answer

We provide complete customs documentation to minimize clearance delays. If your package is held, our logistics team will work directly with customs authorities and your local broker to resolve the issue promptly. We have experience handling customs inquiries in all major markets.

Question 46

Do you handle customs clearance documentation?

Accepted Answer

Yes, we prepare all necessary customs documentation including: Commercial Invoice, Packing List, Certificate of Origin, SDS/MSDS, and product-specific import permits. For complex regulatory requirements, our regulatory affairs team provides additional support.

Question 47

Where is your company located?

Accepted Answer

Zhaoke Biotech is headquartered in Shenzhen, China, with R&D facilities and strategic manufacturing partners across the country. Shenzhen provides excellent logistics connectivity for international shipping and access to world-class biotechnology talent.

Question 48

How long have you been in the peptide industry?

Accepted Answer

We have been serving the global peptide market since 2018, with over 6 years of experience in peptide manufacturing, sourcing, and quality management. Our team brings decades of combined expertise in peptide chemistry and pharmaceutical quality assurance.

Question 49

Can I visit your factory or laboratory?

Accepted Answer

Yes, we welcome qualified customers to visit our facilities. We can arrange laboratory tours, manufacturing partner visits, and face-to-face technical consultations. Please contact us in advance to schedule a visit.

Question 50

Do you work with distributors or partners globally?

Accepted Answer

Yes, we actively seek distribution partners in major markets. We offer attractive distributor pricing, marketing support, technical training, and exclusive territory arrangements for qualified partners. Contact us to discuss partnership opportunities.

Question 51

What is your advantage over other peptide suppliers?

Accepted Answer

Our key advantages: (1) Dual business model — both catalog supply and integrated production solutions; (2) 496+ product portfolio covering 6 categories; (3) Rigorous quality system with full batch testing; (4) Global regulatory compliance support (REACH, FDA, TGA); (5) Comprehensive technical support from synthesis to formulation; (6) Competitive pricing with flexible MOQ.

Question 52

How can I contact your technical support team?

Accepted Answer

You can reach our technical support team via: Email: jade.cheung@zhaokebio.com (24-hour response), Phone/WhatsApp: +86 198 4267 3490 (business hours), or through the contact form on our website. For urgent technical issues, please mark your email as "URGENT".

Frequently Asked Questions

Products and Specifications

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Compliance and Certification

Custom Synthesis and Technical Services

Ordering and Payment

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Company and Partnership

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