Frequently Asked Questions

If you have a question, there is a good chance you will find the answer here. Choose a topic below to see our responses. We strive for transparency and have worked hard to address the questions you might have. If you don't find what you are looking for, please contact us.

Product Information

Do you offer peptide blends?

Yes, we offer peptide blends. For specific requests, please contact us directly, or visit the dedicated section on our website. We also provide combination deals.

How should peptides be reconstituted?

Peptides can be reconstituted using a variety of solvents, depending on their hydrophilic or hydrophobic properties, as well as their acidic or basic nature. Common solvents include saline, bacteriostatic water and acetic acid.

What are peptides, and what are their primary uses in research?

Peptides are made up of short chains of amino acids, serving as the fundamental components of proteins. In research, they play a key role in studying how biological processes work and understanding protein interactions. This makes them especially valuable in fields like regenerative medicine and hormone regulation. Check our introduction to peptides for further information.

What is the shelf life of your peptides, and how should they be stored?

Our lyophilized (powder) peptides should be stored at -20°C to -80°C, with a shelf life of up to 2 years or more. After reconstitution, store them refrigerated at 4°C and use within a few weeks. Always keep vials capped and stored in a cool, dry place, away from light and moisture. Once the cap is removed, we recommend immediate use and advise against storage after opening. For optimal stability, store peptides in dark conditions or in containers that protect them from light exposure.

The table below serves as a guideline for proper storage and shelf life of peptides:

Peptide Form	Storage	Temperature	Shelf-Life
Lyophilized (Powder)	Room	20°C to 25°C	1 month
Lyophilized (Powder)	Fridge	2°C to 8°C	12 months
Lyophilized (Powder)	Freezer	-20°C	48 months
Lyophilized (Powder)	Ultra-Low Temperature Freezer	-80°C	Long-Term
Reconstituted (Liquid)	Room	20°C to 25°C	Short-Term
Reconstituted (Liquid)	Fridge	2°C to 8°C	2 weeks to 2 months
Reconstituted (Liquid)	Freezer	-20°C	Mid-Term
Reconstituted (Liquid)	Ultra-Low Temperature Freezer	-80°C	Long-Term

Quality and Trust

How can I trust the quality of your peptides?

Our quality assurance framework is centred on internal analytical verification conducted throughout the manufacturing process within our UK laboratory facilities.

In addition to internal QC, independent external analytical validation may be utilised on a periodic or as-required basis within our broader oversight structure. Historically, where appropriate, this has included engagement with accredited laboratories operating within established regulatory jurisdictions, such as the United States.

We are currently expanding our third-party analytical capacity within the UK in order to consolidate oversight within a single regulatory environment, enhance consistency of standards, and further strengthen governance within our quality framework. This development represents a significant step forward in our infrastructure, and we anticipate sharing further information regarding these expanded capabilities through future collaborative partnerships, technical publications, and updates across our official communication channels, including blog and social media releases.

What is the purity level of your peptides and what does this mean?

Our peptides have a minimum purity of >99%, ensuring the highest quality for research. This level of purity means our peptides are primarily composed of the target sequence, maximising their effectiveness and reliability. To guarantee this standard, we employ rigorous testing that thoroughly checks the composition and purity of each peptide.

What makes you different as a peptides supplier in the space?

Express Peptides is the official distribution platform for Euro-Gen Laboratories, a UK-based peptide manufacturer and analytical facility.

Where much of the research peptide market operates on a reseller or relabelling model, Euro-Gen manufactures and formulates its products in-house. This includes a specialist focus on cartridge-based peptide-in-solution preparations, requiring precise formulation control and technical handling.

By operating at a granular manufacturing level — from raw material processing through formulation, preparation, and analytical verification — Euro-Gen maintains full end-to-end oversight of production. Activities are conducted within controlled cleanroom environments under a GMP-aligned operational framework designed to uphold rigorous standards of process discipline, documentation, and quality assurance.

This vertically integrated laboratory structure provides a level of control not typically available within distributor-led supply chains. Rather than relying on externally sourced, pre-finished bulk material, Euro-Gen retains direct oversight of formulation integrity, preparation conditions, and in-house analytical scrutiny throughout the manufacturing lifecycle.

As a result, Express Peptides is able to offer:

Direct manufacturer accountability

UK-based cleanroom production environments

GMP-aligned operational standards

End-to-end quality oversight

Greater consistency and supply reliability

Operational agility and formulation flexibility

Capacity for bespoke or specialist preparations where appropriate

This manufacturing-led model enables a more controlled, adaptable, and infrastructure-backed approach within the research materials space - distinguishing Express Peptides meaningfully from reseller-based suppliers.

What makes you trustworthy compared to others in the peptide industry?

What sets us apart in the peptide industry is the wealth of expertise and professionalism that underpins our operations. Our team includes individuals with experience working for three of the top five pharmaceutical companies globally, providing us with an in-depth understanding of the rigorous standards and quality control measures required in this field.

Our leadership possesses extensive knowledge gained from managing multi-million-pound corporations, with a strong grasp of complex supply chains and the specific demands of the pharmaceutical industry. We also have logistics experts who meticulously oversee the storage, handling, and delivery of our products to ensure they arrive in perfect condition, maintaining their purity and efficacy throughout the process.

Additionally, our in-house biochemists bring a high level of scientific insight, guiding the production of peptides that consistently meet the highest industry standards. This blend of experience, professionalism, and specialised expertise ensures that we deliver products of exceptional quality and reliability, setting us apart from others in the market.

Why does it matter that you have a UK hub?

We maintain strict quality control standards, ensuring that our products meet the highest levels of purity and safety. Our strategic hub location allows for faster and more reliable delivery. Unlike products shipped from various countries, you avoid customs delays and extra fees, providing a smoother experience. Our efficient distribution network allows us to get your order to you quickly, demonstrating the speed and reliability often unmatched by international suppliers.

Ordering and Payments

Can I change or cancel my order after it's been placed?

Orders begin processing immediately upon payment and cannot be guaranteed for cancellation prior to dispatch.

Customers requesting cancellation after placing an order may be required to return the goods unopened and in their original condition before a refund can be issued.

Can I request an invoice for my order?

Yes, an invoice will automatically be included with your order and sent to you via email once the purchase is completed. If you need a copy or have any issues finding the invoice, feel free to contact us for assistance.

Do you offer discounts for bulk purchases or promotions?

Yes, we offer discounts for bulk purchases. For more information, please contact us and our team will provide you with the details.

Is my payment information secure on your website?

Yes, your payment information is fully secure on our website. We do not store any payment details - only customer and order data are retained for processing purposes. This data is encrypted using 256-bit encryption, and we employ advanced security algorithms to safeguard your information. Additionally, we are fully compliant with GDPR regulations, ensuring that your personal data is handled responsibly and securely. You can trust that your privacy and payment details are protected at all times.

What payment options do you accept?

We currently accept Credit Card, Debit Card and ApplePay as payment methods. Please be advised: unfortunately, we do not accept American Express through our payment gateway.

Shipping, Delivery & Returns

Are there any extra fees, like taxes or shipping costs, for my order?

For UK orders, all taxes and shipping costs are included at checkout. For international orders, any additional fees, such as customs duties or import taxes, are the responsibility of the customer and should be calculated based on your location. If you need assistance on this, do not hesitate to contact us for guidance.

Can I update my delivery address after placing an order?

Yes, you can update your delivery address as long as your order hasn’t been dispatched. Please contact us directly to make any changes.

Do you accept returns?

Do you ship orders internationally?

Yes, we ship orders internationally. While we do our best to follow regulations in different countries, we recommend that you check the specific import regulations and any potential charges, such as duties or taxes, that may apply in your location. If you have any questions about international shipping or potential charges, feel free to contact us for help.

How long does it typically take for my order to arrive?

UK customers can typically expect next-day delivery if their order is placed before 3pm. For international customers, delivery times will vary depending on your location, but feel free to contact us if you need a specific timeframe.

What shipping methods do you use to send out orders?

We use a variety of trusted shipping carriers to ensure your order is delivered safely and on time. These include FedEx, DPD, UPS, and Royal Mail. The carrier used for your order will depend on your location, the size of your order, and the shipping option you select at checkout. Rest assured, we work with reliable providers to offer fast and secure delivery. If you have a preferred shipping method or specific requirements, feel free to contact us, and we will do our best to accommodate your needs.

What should I do if my order is delayed or hasn't arrived?

If your order is delayed or hasn’t arrived, please first check your tracking information. If the issue persists, feel free to contact us for further assistance.