Quality & transparency

Quality you can verify

We build trust through documentation, not claims. Every batch is independently tested, characterised and certified — here is exactly how, and how you can verify it yourself.

≥99%

Target purity on tested batches

HPLC + MS

Purity & identity methods

3rd-party

Independent testing labs

Per batch

Certificate of Analysis

From synthesis to dispatch

Our quality process

Every compound passes through four controlled stages before it reaches your laboratory. Nothing ships without documentation.

Sourcing & synthesis

Compounds are produced by established synthesis methods (commonly solid-phase peptide synthesis) using quality-controlled inputs.

Purification

Material is purified — typically by preparative HPLC — to remove impurities and isolate the target compound to a high standard.

Independent testing

Tested batches are sent to independent third-party laboratories for purity (HPLC) and identity (mass spectrometry) analysis.

Documentation & dispatch

Results are recorded on a batch Certificate of Analysis. Compounds are lyophilised, labelled for research use, and shipped discreetly.

The methods

How we test

Two industry-standard analytical techniques answer two different questions: how pure is it? and is it the right compound?

HPLC — purity

High-Performance Liquid Chromatography separates a sample into its components and measures what proportion is the target compound versus impurities. The result is the purity percentage you see on a Certificate of Analysis — for tested batches we target ≥99%.

Mass spectrometry — identity

Mass spectrometry measures the molecular weight of the compound, confirming its identity matches the expected structure. Together with HPLC, it verifies you are receiving the correct compound at the stated purity.

Read the evidence

How to read a Certificate of Analysis

A Certificate of Analysis (COA) is the document that proves what a batch actually contains. Knowing how to read one lets you verify any supplier — not just us. A COA typically shows:

Compound name: The exact compound the batch was tested as — confirm it matches what you ordered.
Batch / lot number: A unique identifier tying the certificate to your specific vial. Quote this to verify your batch with us.
Test method: The analytical technique used, e.g. HPLC for purity and MS for identity.
Measured purity: The actual percentage measured for that batch — look for ≥99% on tested material.
Test / issue date: When the analysis was performed, showing the data is current to the batch.

Certificate of Analysis

Rebirths Lab · Sample

Compound: Example Peptide
Batch / lot: RL-000000
Method: HPLC, MS
Purity: ≥99%
Date: YYYY-MM-DD

Illustrative layout. Each tested batch ships with its own certificate showing the real measured values.

What “≥99% purity” means

Purity is the percentage of a sample that is the intended compound rather than impurities or by-products. Higher purity means fewer confounding variables, so research results are more reliable and reproducible. For tested batches we target ≥99% by HPLC, with the exact figure reported per batch.

Storage & stability standards

Lyophilised (freeze-dried) compounds are supplied as a stable powder. As a general guideline they are best kept cool, dark and dry — often frozen for long-term storage — and are stable at ambient temperature for short shipping windows. Per-product storage notes appear on each product page.

Verify your batch

Have a vial in hand? Send us the lot / batch number printed on the label and we’ll provide the matching Certificate of Analysis so you can confirm exactly what you received.

Request a batch COA

Quality & storage

Frequently asked questions

A COA is a document from analytical testing that reports a batch's purity and identity. It lets researchers verify exactly what they are receiving.

Tested batches are supplied with documentation of independent purity and identity analysis. Contact support if you need the COA for a specific batch.

Tested batches are independently analysed by HPLC, with a target purity of ≥99% on tested products. The exact figure for each batch is reported on its COA.

Purity and identity testing is performed by independent third-party laboratories to ensure objective, verifiable results.

We rely on industry-standard methods including HPLC for purity and mass spectrometry for identity confirmation where applicable.

A COA typically shows the compound name, batch/lot number, test method, measured purity percentage and the testing date. The purity figure indicates how much of the sample is the target peptide.

Yes. Each tested batch has a lot number recorded on its COA. Contact support with your order to confirm batch documentation.

Contact support promptly with your order and batch details. We take quality concerns seriously and will investigate according to our quality policy.

We aim for consistency through controlled sourcing and independent testing, but each batch is individually tested and documented so you always have batch-specific data.

Impurities can confound experiments and reduce reproducibility. High, verified purity gives researchers confidence that observed results reflect the target compound.

As a general laboratory guideline, lyophilised peptides are best kept cool, dark and dry — often refrigerated or frozen for long-term storage. Always follow the specific storage notes on the product and COA.

Stored correctly (cool, dark, dry — typically frozen long-term), lyophilised research peptides are generally stable for extended periods. Refer to each product's documentation for specifics.

Once reconstituted, peptides are generally less stable and are typically kept refrigerated and used within a shorter window. Follow standard laboratory handling practice for the specific compound.

Bacteriostatic or sterile water is commonly used in laboratory settings, though the appropriate solvent depends on the peptide. We offer bacteriostatic water as a research supply.

Lyophilised peptides are stable at ambient temperatures for typical transit times, so cold-chain shipping is not usually required. Refrigerate or freeze on arrival per the product notes.

Handle research compounds in an appropriate laboratory environment using standard personal protective equipment and your institution's safety protocols.

Repeated freeze-thaw cycles and prolonged heat or light exposure can degrade peptides. Aliquoting and stable storage help preserve integrity.

Dispose of research compounds and materials in accordance with your institution's guidelines and local regulations for laboratory chemicals.

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