Question 1

What purity standards do your peptides meet?

Accepted Answer

All of our peptides are sourced to a minimum 99% purity standard as measured by HPLC analysis. Purity results for each batch are documented in the accompanying certificate of analysis from Freedom Diagnostics Testing.

Question 2

Do you provide certificates of analysis?

Accepted Answer

Yes. Every peptide comes with certificates of analysis from Freedom Diagnostics Testing, an independent third-party lab. Each CoA includes purity (HPLC), identity confirmation (mass spectrometry), and bacterial endotoxin (LAL) testing results. CoAs are available directly on each peptide page.

Question 3

Are these peptides approved for human use?

Accepted Answer

No. All peptides documented on this site are strictly for in vitro and laboratory research purposes only. They are not approved by the FDA or any other regulatory agency for human consumption, clinical use, or veterinary use.

Question 4

How should I store my peptides?

Accepted Answer

Lyophilized (freeze-dried) peptides should be stored at -20°C (freezer) for long-term storage. Once reconstituted, peptide solutions should be stored at 4°C (refrigerator) and used within 30 days. Keep peptides away from light and repeated freeze-thaw cycles.

Question 5

What does HPLC purity testing measure?

Accepted Answer

High-performance liquid chromatography (HPLC) separates the components of a sample and quantifies the relative abundance of each peak. In peptide analysis, the purity percentage represents the area-under-curve of the target peptide relative to all detected peaks. A 99%+ HPLC purity result means less than 1% of detected material consists of synthesis by-products, truncated sequences, or other impurities.

Question 6

What is bacterial endotoxin testing and why does it matter?

Accepted Answer

Bacterial endotoxins are lipopolysaccharide fragments from Gram-negative bacterial cell walls that can contaminate peptide synthesis. Even at trace levels they can produce inflammatory responses in biological assays and confound research results. LAL (Limulus Amebocyte Lysate) testing per USP <85> standards confirms endotoxin levels fall below the threshold appropriate for research use.

Question 7

What is the difference between lyophilized and reconstituted peptides?

Accepted Answer

Lyophilization (freeze-drying) removes water from the peptide under vacuum, producing a dry powder that is chemically stable for 24-36 months at -20°C. Reconstitution is the act of dissolving that powder in an appropriate solvent. Reconstituted peptide solutions are significantly less stable and should be used within approximately 30 days when refrigerated at 4°C.

Question 8

How do I verify a certificate of analysis is authentic?

Accepted Answer

Every CoA we publish includes a unique accession number assigned by the testing laboratory. You can enter that number at Freedom Diagnostics Testing's verification portal to pull the original lab report directly from their system and confirm it has not been altered.

Question 9

What does "research-grade" mean?

Accepted Answer

Research-grade refers to a compound produced and tested to a standard appropriate for laboratory investigation — typically 99%+ HPLC purity, identity confirmation by mass spectrometry, and low endotoxin levels — but that has not undergone the full clinical trial and regulatory review process required for pharmaceutical approval.

Frequently Asked Questions

Peptides & Quality

Lab Reports & Verification

Research & Compliance