Buying Peptides? Here Is How to Read the Documents

Small orders and bulk peptide purchases: what should your quote request include?

For a small order, confirm the product and packaging first. For a bulk purchase, also specify the total quantity, documentation needs and delivery arrangements. Adapt the same request form to your situation.

Small orders: specify what is in each box

Write the product name, material form, labeled amount per vial, number of vials per box and number of boxes. If you are only choosing a specification, you can list two candidate specifications and ask the supplier to confirm the basis of the quote for each.

Do not just write "want 10 mg", because this may mean the amount per vial, the total amount for a whole box, or the amount needed for one experiment. The unit of the quote should match the request.

Bulk purchases: separate the total amount from packaging needs

Write clearly the total number of boxes or total quantity, whether fixed aliquoting is needed, whether split arrangements are acceptable, and which documents need to be confirmed first. The costs, deliverable items and arrangements in the supplier's reply should be made clear by both parties, and should not be inferred from general product text.

Document requirements should be specific

You can fill in material identity, batch number correspondence, analytical items to be checked, and raw data requirements. When you need a certain document, ask whether it actually exists and what batches it covers; if a document is not available, clearly record it as pending confirmation or unavailable.

This site does not treat general reference COA examples as actual NHD batch documents, and does not assume that every product already has a certain test.

After filling in the form, add one sentence about the purpose

For example, "used to compare materials with DAC and without DAC, need to avoid form confusion." This sentence can help the other party understand why you require that identity statement. The actual research design should be confirmed by the person responsible for the research.

Download the Chinese worksheet (TXT; copy and edit as needed)

Original sources and further reading

• Care and handling of peptides

Sources checked on 2026-10-13. Findings apply to the models and materials studied. Batch quality requires records for the actual batch.

Related research materials

Ask about specifications, quantity and required documents

Questions about a COA? Four practical ways to ask for clarification

Point to the field you do not understand and explain what you need to know. Adapt the four examples below to help the supplier give a useful reply.

The batch numbers do not match

Hello, the batch number on the vial or packaging is ____, and the report number or batch number is ____. Please confirm whether they refer to the same batch and explain the link between them. If there is a replacement report, please identify its version and scope.

Include the relevant label and report details. Hide private information that is not needed for the inquiry. A matching product name alone does not establish that the batch is the same.

There is a purity result, but no method

Hello, the reported purity is ____. Please explain the analytical method, detection mode, integration and calculation basis, and whether the corresponding chromatogram can be provided. We need to understand what this number represents.

Do not assume an HPLC area percentage is the net peptide content of the vial. Different questions may require different tests.

The basis of the labeled 10 mg is unclear

Hello, we need an amount for our experimental calculations. Please confirm what the labeled 10 mg represents, whether content has been measured, and the basis of that result. If it has not been measured, please say so clearly.

Do not invent a percentage to subtract for water, counterions or other components simply to get a convenient number.

Only a result screenshot was supplied

Hello, to understand this report, please identify the sample, original file or report number, test date, method version and data processing method behind the screenshot. If more data are available, please explain the file types and their scope.

Confirm which records are actually available. A screenshot and an instrument’s original data file offer different opportunities for review.

Keep a record of the reply

Put the question, reply, file number, applicable batch and unresolved points in the same table. A note saying only “replied” leaves the next colleague to ask again.

Download the Chinese worksheet (TXT; copy and edit as needed)

Original sources and further reading

• ICH Q2(R2): validation of analytical procedures · 2024

Sources checked on 2026-10-13. Findings apply to the models and materials studied. Batch quality requires records for the actual batch.

Sending peptides for analysis: help the lab answer the right question

"Please test my peptide for me" is usually not specific enough. First state what the material is, what processing it has undergone, and which question you want answered; then the testing party can confirm the applicable tests.

Write the material identity first, not just a nickname

Provide the full name, sequence or identity record, terminal groups and other modifications, salt or material form, batch number and packaging details. For mixtures, list the known components and ratios. Mark anything uncertain as “to be confirmed”.

Tell the testing party what steps the sample has undergone

Whether it has already been dissolved, the solvent used, the container, the time of preparation, and storage and transfer conditions can all affect the analysis. Sending only the current sample without describing the processing history can make the results hard to interpret.

Do not write an unmeasured concentration as a measured value. Distinguish between concentration calculated from the label claim, calculated from weighing, and already quantified concentration, and state the basis.

The target question determines the proposed tests

To confirm composition-related mass, sequence, configuration, content, or impurities, the evidence needed may differ. For example, intact mass matching cannot by itself answer all sequence or D/L configuration questions.

Write the question clearly in the request, then ask the testing party to explain the recommended method, scope of application, sample required, and the report format they can provide. This table does not guarantee service capability on behalf of any testing organization.

Also state report delivery requirements in advance

State whether you need a method description, chromatograms, mass spectra, reviewable data, or other records, and confirm the sample and lot number corresponding to the documents. The final delivery scope is subject to the actual confirmed results.

After receiving the results, return to the original question

Check the sample number, lot number, method, test date, result units, and range. If the results do not answer the original question, record the gap and then discuss additional analysis; do not replace the evidence actually needed with a convenient number.

Download the Chinese worksheet (TXT; copy and edit as needed)

Original sources and further reading

• ICH Q2(R2): validation of analytical procedures · 2024
• Peptide design guidance

Sources checked on 2026-10-13. Findings apply to the models and materials studied. Batch quality requires records for the actual batch.

Two reports for one peptide batch: which version should you use?

When two versions of a report appear for the same batch of material, first check the report number and revision notes. A version update does not necessarily mean the sample changed, but you need to know whether what changed was wording, calculations, or test results.

First, separate "report" from "batch"

A batch number identifies a batch of material; a report number and version identify a document. One batch may have reports for different projects or from different times; the same report may also be updated due to corrections. A later date alone is not enough to understand why it was updated.

Use a hypothetical example to understand three kinds of changes

Report A version 1 wrote the unit incorrectly, and version 2 corrects the unit: this is a wording or unit correction, and you need to confirm whether the meaning of the value changes along with it. Report B version 2 changes integration or calculation: it should explain the processing method and the change in results. Report C adds testing of another sample: you should confirm whether it still covers the original batch and the original question.

All of the above are teaching examples; no real NHD test report is shown. Different changes require different items to verify.

What information should you confirm with the issuer?

Please confirm the report number, the currently valid version, the revision date, the reason for revision, whether the old version has been replaced, and which fields are affected by the change. If retesting is involved, also confirm the sample, method, and test date.

How should you keep them in the folder?

Keep one clearly identified current version, and place old versions in historical records with a note on the replacement relationship. File names may include the batch number, report number, version, and date, but do not let the file name replace the formal report content.

When handing over to a new colleague, what should be handed over together?

Hand over the current report, the version notes, the relevant batch records, and unresolved issues. This way the new colleague can know why this one was chosen, rather than guessing from the timing of email attachments.

Download the Chinese worksheet (TXT; copy and edit as needed)

Original sources and further reading

• ICH Q2(R2): validation of analytical procedures · 2024

Sources checked on 2026-10-13. Findings apply to the models and materials studied. Batch quality requires records for the actual batch.

After Reconstitution: What Belongs on a Peptide Label?

Make a solution label traceable with identity, concentration, solvent and preparation records, without inventing an expiry date.

Connect the solution to the original material

Include material name, original batch and preparation or aliquot identifier. Relevant modifications, labels and form must remain traceable. A controlled reference can save label space, but it must lead to a record rather than exist only in someone's memory.

Write the unit and concentration basis

“Concentration 1” is incomplete. Use a full unit and link the calculation basis where needed. A nominal concentration calculated from the label differs from a measured concentration. Do not use the same description for both.

Keep solvent and preparation date visible

Record solvent or buffer, relevant conditions, preparation date and operator. Further dilution creates a different solution and needs a corresponding record, rather than the previous concentration label. Link final volume and actual material input where appropriate.

Preparation date does not determine expiry

A preparation date does not automatically provide a month or half-year of usability. Material, solution, container and storage conditions matter. If no supported lifetime is established, retain the unresolved status instead of inventing an expiry date.

A short fill-in template

Material name; original batch; preparation or aliquot identifier; concentration and unit; calculation-record reference; solvent; preparation date and operator; applicable storage requirements. This is a blank record template, not a certificate or completed result for any product.

Make the label and documents searchable together

Connect the identifier to purchasing, preparation, testing and use records. Product pages identify catalog materials; they cannot replace the original batch identifier or your laboratory's preparation history.

References

• Care and Handling of Peptides

Published findings, hypothetical teaching examples and material information are distinguished. Read the original methods before attempting replication.

Related research materials

BPC-157View material information and specifications, or submit an enquiry.GHK-CuView material information and specifications, or submit an enquiry.KPVView material information and specifications, or submit an enquiry.

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Research reading and material enquiries only. This page is not personal medical advice or a substitute for batch-specific records.