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this Frequently Asked Questions have been updated.
What Are Peptides and How Are They Produced?
Peptides are small sequences of amino acids, generally made up of 2 to 50 amino acid residues connected through peptide bonds. They are extensively utilized in areas such as pharmaceutical development, immunology, cellular research, and drug discovery programs.
Our peptides are manufactured using solid-phase peptide synthesis (SPPS), the recognized standard method for producing research-grade peptides. During this process, amino acids are sequentially attached to a growing peptide chain anchored to a resin support. After the sequence is fully completed, the peptide is separated from the resin, purified through reverse-phase HPLC, and lyophilized into a stable powdered form.
This process allows for exceptional accuracy in sequence construction, purity, and batch-to-batch consistency. Comprehensive in-house quality testing is performed to verify purity and identity, and Certificates of Analysis (CoAs) are available for download on every product page.
Note: All products are strictly intended for in-vitro laboratory research purposes only and are not approved for human or animal consumption
Is mannitol included in your peptides?
Certain peptides may include mannitol as an excipient. Mannitol is a sugar alcohol commonly used as a bulking and stabilizing agent during the freeze-drying (lyophilisation) process. Its inclusion helps maintain peptide stability and creates a more consistent and visible lyophilized cake within the vial.
Mannitol is considered inert and does not compromise peptide purity or interfere with laboratory research applications and assays. Product pages clearly indicate when mannitol is included in the formulation. If your research requires a mannitol-free option, please contact us and we will review available alternatives for your specific application.
Why does my vial look different or seem to have no vacuum seal?
Small cosmetic variations between vials are completely normal and are not a sign of reduced quality. The freeze-dried peptide may appear as a firm, solid cake in some vials and as a lighter or more powder-like texture in others. Cap colours may also vary from batch to batch.
Certain vials are vacuum-sealed, while others may be nitrogen-flushed depending on the manufacturer and the specific peptide formulation. The absence of a vacuum seal does not impact the peptide’s purity or integrity, provided the vial has been properly stored in sealed conditions, refrigerated, and protected from light exposure.
If you notice anything unusual with your vial, such as a damaged seal or visible contamination, please contact us with clear photos so our team can investigate further.
Do you offer peptide blends (e.g., CJC-1295 combined with Ipamorelin)?
No, we do not offer pre-mixed peptide blends. Each peptide is supplied as a separate, single-ingredient product.
This approach is part of our commitment to strict quality control standards. Combining multiple peptides in a single vial can make it more difficult to accurately confirm the purity, identity, and concentration of each individual component. By providing peptides separately, every compound can be independently tested and matched to its own Certificate of Analysis.
If your research requires more than one peptide, we recommend purchasing each compound individually and preparing or combining them according to your specific study protocols.
What vial capacities are offered?
Vial capacities and peptide amounts differ depending on the product and are specified on each individual product page. Typical options include 2mg, 5mg, 10mg, and 15mg, while certain peptides may also be offered in higher quantities.
All vials are manufactured from laboratory-grade borosilicate glass and fitted with aluminium crimp seals and rubber stoppers. The precise peptide amount contained in each vial is clearly indicated on the corresponding product page. If you require a quantity that is not currently available on the website, feel free to contact us.
Do you offer a Certificate of Analysis (CoA)?
You can request In-house CoAs via the Certificate of Analysis page. These documents are not batch-specific and are intended to verify the identity and minimum purity of each product based on internal HPLC and MS testing. CoAs are not automatically included with orders. To obtain one, simply visit the request page and enter the product name and your email in the designated fields. We also recommend that researchers conduct independent testing when batch-level verification is required for their studies.
A typical in-house CoA includes:
Peptide identity: Sequence, molecular formula, and molecular weight.
Purity: Assessed by HPLC analysis and expressed as a percentage (usually ≥98% for most products).
Mass spectrometry: Verification of molecular identity using MS or LC-MS.
Appearance: Description of the lyophilised product’s physical form.
Batch/lot number: Provided for reference purposes.
If a CoA is not available on the product page, please contact us and we will assist in providing it.
Do you provide independent third-party HPLC reports or raw analytical data?
No. We operate through a long-term compounding facility that manufactures all of our peptides and supplies internal HPLC and LC-MS datasets for documentation purposes. These reports are not made public due to proprietary methods and software formats.
For independent verification, we recommend that samples be submitted for external testing by the end user. In research contexts, validation should be carried out by the investigator rather than the supplier.
We do not rely on third-party laboratories, as many online “independent” labs are not properly accredited or fully traceable.
A standard in-house CoA typically includes:
Peptide identity: Sequence, molecular formula, and molecular weight.
Purity: Assessed via HPLC analysis and reported as a percentage (generally ≥98% for most products).
Mass spectrometry: Verification of molecular identity using MS or LC-MS.
Appearance: Description of the lyophilised material.
Batch/lot number: For tracking and reference purposes.
If a CoA is not available on the product page, please contact us and we will arrange it.
What are typical impurities found in peptide synthesis?
Even the highest-quality peptide synthesis can result in trace-level impurities. The most frequently observed include:
**Deletion sequences:** Peptides that are missing one or more amino acids from the intended sequence, usually due to incomplete coupling during synthesis.
**Truncated sequences:** Shorter peptide fragments formed when chain elongation terminates prematurely.
**Oxidized forms:** Commonly seen in peptides containing methionine or cysteine residues, typically arising during synthesis, cleavage, or storage conditions.
**Deamidation products:** Conversion of asparagine and glutamine residues into aspartic acid or glutamic acid.
**Racemisation:** The conversion of L-amino acids into their D-forms at specific positions, often occurring during base-mediated reaction steps.
**Residual solvents and reagents:** Trace amounts of substances such as TFA (trifluoroacetic acid), acetonitrile, or scavengers remaining from cleavage and purification stages.
These impurities are detected and measured through HPLC analysis. The purity value stated on the Certificate of Analysis represents the proportion of the desired peptide relative to all peptide-related material present. Our standard supply specification is typically 98%+ purity, indicating that total impurities make up less than 2% of the product.
Which payment methods do you accept?
We offer the following payment options:
Bank transfer (BACS/Faster Payments): Bank details will be shown at checkout. Orders are only processed once the payment has been received and cleared.
Card payments: We accept Visa, Mastercard, and other major credit and debit cards at checkout.
Cryptocurrency: Bitcoin is accepted as a payment method at checkout.
All transactions are processed in GBP (British Pounds). For international bank transfers, your bank may charge currency conversion or additional processing fees, which are not controlled by us.
Full payment is required before your order is dispatched. If you have made a payment that has not yet reflected, please allow up to one working business day for bank transfers to clear before contacting support.
When will my order be processed?
Orders are processed in the sequence they are received, once payment has been confirmed:
Payment confirmed before 3pm: Orders are typically shipped the same working day.
Payment confirmed after 3pm: Orders are usually dispatched on the next working day.
Weekends and bank holidays: Orders placed during weekends or public holidays are processed on the next working day.
Once your order has been dispatched, you will receive an email containing tracking details. During peak periods, processing times may be slightly extended. If any delays occur, we will notify you accordingly.
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