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Home / FAQs

FAQs

About Our Products

What are peptides?

Peptides are short chains of amino acids linked together by peptide bonds. They are widely used in laboratory and analytical research as reference materials, experimental compounds, and tools for studying biological and chemical processes.

In research environments, peptides are valued for their defined molecular structure and predictable behaviour under controlled conditions.

How are peptides made?

Our peptides are produced using solid-phase peptide synthesis (SPPS), a well-established laboratory manufacturing method used globally in research and pharmaceutical development.

This process involves:

  • Sequential assembly of amino acids in a defined order

  • Controlled use of protective groups to ensure accuracy

  • Cleavage, purification, and analytical verification

  • Lyophilisation (freeze-drying) to produce a stable final material

This approach supports consistency, repeatability, and specification control across batches.

What are your peptides intended for?

All products are supplied strictly for laboratory research use.

They are intended for:

  • Analytical testing

  • Method development

  • Reference and comparison studies

  • Controlled experimental research

They are not approved for human consumption, veterinary use, medical treatment, cosmetic application, or food use.

Do you sell peptides for personal or therapeutic use?

No.

Products are supplied exclusively for research and laboratory purposes and are not marketed, labelled, or approved for personal, therapeutic, or clinical use under any circumstances.

What form do peptides arrive in?

Peptides are supplied as lyophilised (freeze-dried) solids in sealed laboratory vials.

Lyophilisation is used to:

  • Improve stability during storage and transport

  • Support long-term integrity when stored correctly

  • Allow controlled reconstitution in laboratory settings

This is standard practice for research-grade peptides.

Why do some vials appear empty or partially filled?

Peptides are supplied by net mass, not by visible volume.

Because lyophilised material is extremely light and porous, the contents may appear minimal, unevenly distributed, or adhered to the vial walls. This is normal and does not indicate under-filling.

How should peptides be handled and stored?

Peptides should be handled using appropriate laboratory practices and stored according to the guidance provided with the product.

Storage requirements vary depending on the compound and research application. Customers are responsible for ensuring correct handling and compliance within their facilities.

Quality, Testing & Documentation

Are your peptides independently tested?

Analytical testing is performed on representative batches to verify identity and purity using industry-standard laboratory methods.

Testing practices are designed to support consistency, traceability, and quality control appropriate for research-use materials.

What quality controls are applied to your products?

Quality control processes include:

  • Verification of peptide identity

  • Assessment of purity against defined specifications

  • Review of analytical results prior to release

These controls are applied to support reliable use in laboratory research settings.

Do you provide Certificates of Analysis (CoA)?

Documentation is provided where applicable to confirm key analytical characteristics relevant to research use.

Certificates or documentation summaries are prepared internally based on verified analytical data and manufacturing specifications.

Why aren’t full laboratory reports publicly available?

Raw analytical data and full third-party laboratory reports are not displayed publicly to prevent misinterpretation outside of controlled research environments.

Where appropriate, documentation summaries are provided to support research continuity while maintaining responsible data handling standards.

What does peptide purity mean?

Purity refers to the proportion of the target peptide relative to related compounds or synthesis by-products.

Reported purity values are based on analytical methods such as HPLC and are intended to support comparative and reproducible research.

Do your products contain endotoxins or contaminants?

Products supplied are intended for research use only and are not tested or validated for clinical or therapeutic thresholds.

Researchers requiring specific endotoxin or contaminant specifications must assess suitability within their own experimental frameworks.

What is net peptide content?

Net peptide content refers to the actual amount of peptide present, excluding residual solvents, salts, or counter-ions.

This information is relevant when designing controlled research experiments and comparisons.

Orders & Payments

What payment methods do you accept?

We accept a range of payment methods made available at checkout, depending on location and order value.

Available payment options are displayed clearly during the checkout process.

Is there a minimum order value?

Minimum order values may apply and are displayed at checkout where relevant.

This helps ensure efficient processing, packaging, and dispatch of research materials.

When is my order processed after payment?

Orders are typically processed once payment has been successfully received and verified.

Processing includes order validation, preparation, and packaging prior to dispatch.

Can I change or cancel my order after placing it?

Order changes or cancellations may be possible only before dispatch.

Once an order has entered the processing or shipping stage, changes may no longer be possible. Customers should contact support as soon as possible if a correction is required.

What should I do if I made a mistake during checkout?

If an error was made during checkout (such as an incorrect address or product selection), contact customer support immediately.

Requests are handled on a case-by-case basis depending on the order status.

Do you offer discount codes or promotions?

Discounts or promotional offers may be made available periodically.

Where applicable, discount codes must be applied at checkout and cannot be applied retroactively.

Shipping & Dispatch

Where do you ship from?

Orders are dispatched from the UK.

Dispatch locations are selected to support efficient handling and reliable delivery.

How are peptides packaged for shipping?

Products are packaged using appropriate protective materials to support stability during transport.

Packaging is designed to:

  • Protect the vial and contents

  • Minimise exposure to environmental factors

  • Maintain discretion during transit

When will my order be dispatched?

Orders are typically dispatched within the stated processing timeframe after payment confirmation.

Dispatch times may vary during periods of high demand or public holidays.

How long does delivery take?

Delivery times vary depending on:

  • Destination

  • Shipping method selected

  • Customs clearance (for international orders)

Estimated delivery times are provided at checkout where possible.

Will I receive tracking information?

Tracking details are provided once an order has been dispatched, where tracking services are available.

Customers are responsible for monitoring tracking updates after dispatch.

International Shipping & Customs

Do you ship internationally?

Yes, international shipping is available to many destinations.

Availability depends on local regulations, shipping restrictions, and carrier coverage.

Will I have to pay customs duties or import taxes?

Customs duties, import taxes, or fees are determined by the destination country and are the responsibility of the recipient.

These charges are not included in the product or shipping price unless explicitly stated.

Can you mark parcels as gifts or declare a lower value?

No.

All shipments are declared accurately in accordance with shipping and customs regulations.

Requests to misdeclare contents or value cannot be accommodated.

What happens if my parcel is held or rejected by customs?

Customs decisions are outside our control.

If a parcel is delayed, held, or rejected by customs authorities, the customer is responsible for liaising with the relevant authority. Outcomes depend on local regulations and enforcement practices.

What if my international shipment goes missing?

International shipments are subject to extended transit times and additional handling.

If a parcel appears delayed or missing, customers should contact support once sufficient time has passed for investigation.

Delivery Issues & Returns

What should I do if my parcel has not arrived?

If your parcel has not arrived within the expected timeframe, first review the tracking information provided.

If the issue persists, contact customer support with your order details for further review.

What happens if tracking shows “Delivered” but I did not receive the parcel?

If tracking indicates delivery but the parcel cannot be located, customers should:

  • Check with local mail services or reception points

  • Confirm the delivery address provided

An investigation may be initiated where appropriate.

Why do you investigate delivery issues before reshipping or refunding?

Investigations are required to confirm the status of a shipment and prevent duplicate fulfilment.

This process helps ensure fairness and accuracy for all customers.

Do you automatically resend orders that go missing?

Reshipments are not automatic and are handled on a case-by-case basis following investigation.

Eligibility depends on the outcome of the review and shipping method used.

What is your returns policy?

Due to the nature of research materials, returns are generally not accepted once products have been dispatched.

Exceptions may apply in limited circumstances and are assessed individually.

Account & Customer Support

I didn’t receive my order confirmation email — what should I do?

Order confirmation emails are sent automatically after checkout.

If you do not receive one, please check your spam or junk folder before contacting support.

How can I update my account details?

Account details can be updated by logging into your account and accessing the account settings area.

Can I change my shipping address after placing an order?

Address changes may be possible only before dispatch.

Once an order has shipped, address changes cannot be made.

I placed an order but haven’t received any updates — what now?

If no updates have been received within the expected timeframe, contact customer support with your order number for assistance.

How do I contact customer support?

Customer support can be contacted using the details provided on the Contact Us page.

Please include your order number and relevant details to allow efficient assistance.

What are peptides?

Peptides are short chains of amino acids linked together by peptide bonds. They are widely used in laboratory and analytical research as reference materials, experimental compounds, and tools for studying biological and chemical processes.

In research environments, peptides are valued for their defined molecular structure and predictable behaviour under controlled conditions.

How are peptides made?

Our peptides are produced using solid-phase peptide synthesis (SPPS), a well-established laboratory manufacturing method used globally in research and pharmaceutical development.

This process involves:

  • Sequential assembly of amino acids in a defined order

  • Controlled use of protective groups to ensure accuracy

  • Cleavage, purification, and analytical verification

  • Lyophilisation (freeze-drying) to produce a stable final material

This approach supports consistency, repeatability, and specification control across batches.

What are your peptides intended for?

All products are supplied strictly for laboratory research use.

They are intended for:

  • Analytical testing

  • Method development

  • Reference and comparison studies

  • Controlled experimental research

They are not approved for human consumption, veterinary use, medical treatment, cosmetic application, or food use.

Do you sell peptides for personal or therapeutic use?

No.

Products are supplied exclusively for research and laboratory purposes and are not marketed, labelled, or approved for personal, therapeutic, or clinical use under any circumstances.

What form do peptides arrive in?

Peptides are supplied as lyophilised (freeze-dried) solids in sealed laboratory vials.

Lyophilisation is used to:

  • Improve stability during storage and transport

  • Support long-term integrity when stored correctly

  • Allow controlled reconstitution in laboratory settings

This is standard practice for research-grade peptides.

Why do some vials appear empty or partially filled?

Peptides are supplied by net mass, not by visible volume.

Because lyophilised material is extremely light and porous, the contents may appear minimal, unevenly distributed, or adhered to the vial walls. This is normal and does not indicate under-filling.

How should peptides be handled and stored?

Peptides should be handled using appropriate laboratory practices and stored according to the guidance provided with the product.

Storage requirements vary depending on the compound and research application. Customers are responsible for ensuring correct handling and compliance within their facilities.

Are your peptides independently tested?

Analytical testing is performed on representative batches to verify identity and purity using industry-standard laboratory methods.

Testing practices are designed to support consistency, traceability, and quality control appropriate for research-use materials.

What quality controls are applied to your products?

Quality control processes include:

  • Verification of peptide identity

  • Assessment of purity against defined specifications

  • Review of analytical results prior to release

These controls are applied to support reliable use in laboratory research settings.

Do you provide Certificates of Analysis (CoA)?

Documentation is provided where applicable to confirm key analytical characteristics relevant to research use.

Certificates or documentation summaries are prepared internally based on verified analytical data and manufacturing specifications.

Why aren’t full laboratory reports publicly available?

Raw analytical data and full third-party laboratory reports are not displayed publicly to prevent misinterpretation outside of controlled research environments.

Where appropriate, documentation summaries are provided to support research continuity while maintaining responsible data handling standards.

What does peptide purity mean?

Purity refers to the proportion of the target peptide relative to related compounds or synthesis by-products.

Reported purity values are based on analytical methods such as HPLC and are intended to support comparative and reproducible research.

Do your products contain endotoxins or contaminants?

Products supplied are intended for research use only and are not tested or validated for clinical or therapeutic thresholds.

Researchers requiring specific endotoxin or contaminant specifications must assess suitability within their own experimental frameworks.

What is net peptide content?

Net peptide content refers to the actual amount of peptide present, excluding residual solvents, salts, or counter-ions.

This information is relevant when designing controlled research experiments and comparisons.

What payment methods do you accept?

We accept a range of payment methods made available at checkout, depending on location and order value.

Available payment options are displayed clearly during the checkout process.

Is there a minimum order value?

Minimum order values may apply and are displayed at checkout where relevant.

This helps ensure efficient processing, packaging, and dispatch of research materials.

When is my order processed after payment?

Orders are typically processed once payment has been successfully received and verified.

Processing includes order validation, preparation, and packaging prior to dispatch.

Can I change or cancel my order after placing it?

Order changes or cancellations may be possible only before dispatch.

Once an order has entered the processing or shipping stage, changes may no longer be possible. Customers should contact support as soon as possible if a correction is required.

What should I do if I made a mistake during checkout?

If an error was made during checkout (such as an incorrect address or product selection), contact customer support immediately.

Requests are handled on a case-by-case basis depending on the order status.

Do you offer discount codes or promotions?

Discounts or promotional offers may be made available periodically.

Where applicable, discount codes must be applied at checkout and cannot be applied retroactively.

Where do you ship from?

Orders are dispatched from the UK.

Dispatch locations are selected to support efficient handling and reliable delivery.

How are peptides packaged for shipping?

Products are packaged using appropriate protective materials to support stability during transport.

Packaging is designed to:

  • Protect the vial and contents

  • Minimise exposure to environmental factors

  • Maintain discretion during transit

When will my order be dispatched?

Orders are typically dispatched within the stated processing timeframe after payment confirmation.

Dispatch times may vary during periods of high demand or public holidays.

How long does delivery take?

Delivery times vary depending on:

  • Destination

  • Shipping method selected

  • Customs clearance (for international orders)

Estimated delivery times are provided at checkout where possible.

Will I receive tracking information?

Tracking details are provided once an order has been dispatched, where tracking services are available.

Customers are responsible for monitoring tracking updates after dispatch.

Do you ship internationally?

Yes, international shipping is available to many destinations.

Availability depends on local regulations, shipping restrictions, and carrier coverage.

Will I have to pay customs duties or import taxes?

Customs duties, import taxes, or fees are determined by the destination country and are the responsibility of the recipient.

These charges are not included in the product or shipping price unless explicitly stated.

Can you mark parcels as gifts or declare a lower value?

No.

All shipments are declared accurately in accordance with shipping and customs regulations.

Requests to misdeclare contents or value cannot be accommodated.

What happens if my parcel is held or rejected by customs?

Customs decisions are outside our control.

If a parcel is delayed, held, or rejected by customs authorities, the customer is responsible for liaising with the relevant authority. Outcomes depend on local regulations and enforcement practices.

What if my international shipment goes missing?

International shipments are subject to extended transit times and additional handling.

If a parcel appears delayed or missing, customers should contact support once sufficient time has passed for investigation.

What should I do if my parcel has not arrived?

If your parcel has not arrived within the expected timeframe, first review the tracking information provided.

If the issue persists, contact customer support with your order details for further review.

What happens if tracking shows “Delivered” but I did not receive the parcel?

If tracking indicates delivery but the parcel cannot be located, customers should:

  • Check with local mail services or reception points

  • Confirm the delivery address provided

An investigation may be initiated where appropriate.

Why do you investigate delivery issues before reshipping or refunding?

Investigations are required to confirm the status of a shipment and prevent duplicate fulfilment.

This process helps ensure fairness and accuracy for all customers.

Do you automatically resend orders that go missing?

Reshipments are not automatic and are handled on a case-by-case basis following investigation.

Eligibility depends on the outcome of the review and shipping method used.

What is your returns policy?

Due to the nature of research materials, returns are generally not accepted once products have been dispatched.

Exceptions may apply in limited circumstances and are assessed individually.

I didn’t receive my order confirmation email — what should I do?

Order confirmation emails are sent automatically after checkout.

If you do not receive one, please check your spam or junk folder before contacting support.

How can I update my account details?

Account details can be updated by logging into your account and accessing the account settings area.

Can I change my shipping address after placing an order?

Address changes may be possible only before dispatch.

Once an order has shipped, address changes cannot be made.

I placed an order but haven’t received any updates — what now?

If no updates have been received within the expected timeframe, contact customer support with your order number for assistance.

How do I contact customer support?

Customer support can be contacted using the details provided on the Contact Us page.

Please include your order number and relevant details to allow efficient assistance.

Still have questions?

If you can’t find the answer to your question above, our team is available to help with product information, ordering, documentation, and general enquiries related to our research peptides.

We aim to respond to all enquiries within one business day during working hours.

You can reach us at support@pepnex.com with your enquiry.

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    • Home
    • Buy Peptides
      • All Peptides
      • Bioregulators
      • GH-Related
      • Signalling
      • Neuroactive
      • Research Compounds
      • Solutions
    • Bundles
    • Peptide Research
    • FAQsASK
    • About Us
    • Peptide CalculatorNEW
    • Contact Us