Science & Quality

Premium research
starts with evidence.

At PURE, research materials should be supported by clear documentation, validated testing, and responsible sourcing. This page explains how peptides work, how they are tested, what our quality standards are, and how to evaluate the information you find online.

View our testing process Verify a batch

Research Use Only

Laboratory research purposes exclusively.

Batch Transparency

Batch records presented when available.

Quality Focused

Materials selected for qualified research.

U.S. Based

Independent research-materials company.

The science

Understanding peptides.

Peptides are short chains of amino acids that play key roles in biological processes. Learn how they work, the different types, and their research applications.

What are peptides?

Short chains of 2–50 amino acids linked by peptide bonds — found in the body or made in laboratories.

How peptides work

A peptide binds to a specific receptor, triggering signals that change how cells behave.

Research applications

Cell biology, neuroscience, immunology, metabolism and regenerative research.

Our approach

The PURE quality standard.

Our end-to-end approach helps ensure the materials you receive are what they are intended to be. Quality is more than a single test result — it's sourcing, testing, documentation, handling, and transparency together.

01
Qualified sourcing
Work with reputable suppliers and established manufacturing partners.
02
Analytical verification
Identity, purity, and content tested using recognized methods (MS, HPLC, assay).
03
Batch documentation
COAs and supporting records provided when available.
04
Careful storage
Proper storage, packaging, and chain of custody.

Understanding testing

What we test for — and what it means.

Different analytical methods answer different questions. Learn what identity, purity, and content testing can tell you, and the limits of each method.

Mass spectrometry (MS)

Confirms the molecular weight and helps verify identity — that a peptide matches the expected sequence.

Confirms molecular weight
Verifies identity
Widely used for peptide analysis

The five questions every researcher should ask

Before you buy any research peptide, ask these five questions.

Is the identity verified?

Is the material actually the peptide it is represented to be?

Look for: Appropriate identity testing such as mass spectrometry.

Is purity actually measured?

Is the stated purity supported by an analytical method?

Look for: HPLC or another appropriate chromatographic method.

Does the COA match the exact batch?

Does the documentation correspond to the actual lot you're purchasing?

Look for: Product name, batch/lot number, test date, specifications and actual results.

Who performed the testing?

Can you identify the laboratory and understand what testing was performed?

Look for: Identifiable laboratories and appropriate credentialing where applicable.

Can you actually see the results?

Don't simply accept "third-party tested."

Look for: Accessible documentation showing what was tested, how it was tested, and the reported results.

Here's why those questions matter

Reliable results

Quality-controlled materials help reduce unnecessary variables in research.

Data integrity

Consistent material characteristics make results easier to interpret and reproduce.

Research confidence

Knowing what was tested — and how — gives researchers greater confidence.

Time & cost

Poor-quality materials can create failed experiments and wasted resources.

Documentation

Batch-specific analytical information creates a record researchers can review and retain.

Identity + purity + content

Three different questions. All important.

Identity
Is it what it says it is?
Answered by methods like mass spectrometry.
Purity
What does the analytical method show about the material's purity profile?
Answered by methods like HPLC.
Content / assay
How much peptide is present according to the stated method?
Answered by quantitative assay methods.

One number cannot answer every quality question.

The PURE quality standard

Our end-to-end approach to ensure the highest standards.

01
Raw material
Selection and documentation
02
Identity verification
Confirm the peptide
03
Purity analysis
Analytical characterization
04
Content / assay
Quantitative assessment against characterizations
05
Batch verification
Review results and specifications
06
Documented COA
Batch-specific documentation
07
Storage & handling
Protect material integrity through appropriate handling

Quality is the combination of appropriate testing, specifications, documentation, handling, and transparency.

What we test for

Testing answers different questions.

Mass spectrometry
Molecular identity
HPLC / chromatography
Purity profile and related impurities
Assay / content
Quantity of peptide under the stated method
Microbial testing
Microbial contamination
Endotoxin testing
Bacterial endotoxin levels
Residual solvents
Relevant solvent residues
Heavy metals
Elemental / trace metal contaminants
Appearance
Physical characteristics
Stability testing
How the material changes under defined conditions over time

Testing is material- and specification-dependent. No single analytical test answers every quality question.

How to read a COA

A Certificate of Analysis tells the story of your batch.

1
Product
What material was tested?
2
Batch / lot
Does it correspond to your material?
3
Method
How was it tested?
4
Specification
The acceptable range.
5
Result
The actual result.
6
Test date
When was the analysis performed?
7
Laboratory
Who performed the analysis?

PURE

Certificate of Analysis

Product name: BPC-157
Batch number: BPC157-052024
Sequence: Ac-Pro-Lys-Gly-Pro-Pro-Pro-Ala
Molecular weight: 1419.5 Da
Appearance: White lyophilized powder

Test	Method	Specification	Result
Identity (MS)	Mass Spec	Matches reference	Pass
Purity (HPLC)	HPLC	≥ 98%	99.3%
Peptide content	Assay	≥ 98%	98.7%
Endotoxin (EU/mg)	LAL	< 1.0	< 0.20
Microbial count	USP	< 100 cfu/g	< 10 cfu/g

Approved by: A. Reynolds · Date: 05/20/2024 · For research use only

What a COA does — and doesn't — tell you

A COA can help you understand:

What was tested
Which batch was tested
Which analytical methods were used
The reported specifications
The reported results

A COA does not automatically establish:

FDA approval
Human safety
Clinical effectiveness
Medical suitability
Long-term stability
That every vial has the same result

Follow your batch

Your batch. Your documentation.

Scan

Scan the QR code on the vial.

Verify

Enter or confirm the batch number.

Review

View the corresponding COA and test results.

Understand

Review the methods, specifications, and results.

Research

Use the documentation as part of your research records.

Verify a batch

What to look for in a peptide supplier

Batch-specific documentation
Independent testing
Identifiable laboratory
Clear analytical methods
Appropriate storage & handling
Transparent communication

How to spot a weak quality program

No generic COA for multiple batches
No batch or lot number
No identifiable testing laboratory
No analytical method listed
Only a "99%" marketing claim
No actual analytical results
Vague "third-party tested" language
No explanation of storage/handling

Testing has limits

No single test answers every question. Mass spectrometry provides identity information. Chromatographic methods characterize purity and related compounds. Microbial and endotoxin testing answer different questions. Stability studies address stability under defined or simulated conditions.