Quality
Quality should be
something you can verify.
Whether you're new to peptide research or an experienced researcher, knowing what to look for matters. PURE believes quality should be supported by testing, documentation, transparency, and responsible handling — not simply a number on a website.
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.
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.
Quality is the combination of appropriate testing, specifications, documentation, handling, and transparency.
The PURE research quality checklist
- Is the identity verified?
- Is purity analytically measured?
- Does the documentation match the batch?
- Is the testing laboratory identifiable?
- Are the analytical methods disclosed?
- Are specifications and actual results available?
- Are storage requirements clear?
- Can the documentation be independently reviewed?
- Are claims consistent with the stated research-use purpose?
If you can't answer the questions, ask the supplier.
All PURE products and information are intended solely for laboratory research purposes. Not for human consumption.
Research Use Only
Laboratory research purposes exclusively.
Batch Transparency
COA documentation available for every batch.
Purity & Identity
Independent testing for purity and identity.
Temperature-Conscious
Temperature-conscious packaging and handling.
Made in the USA
Proudly manufactured in the United States.
Built for Researchers
Created for the scientific community, by the community.