Certificate of analysis
Sample document
LL-37 5mg
99.87%Purity
- Batch
- OP-LL5-0726
- Tested
- Jul 26, 2026
- Method
- See original report
- Lab
- Janoshik Analytical
About Offline Peptides
Research materials, documented by lot.
Offline Peptides supplies analytical-grade biochemical reference standards and laboratory research materials to qualified research customers. Materials are intended exclusively for in-vitro research, analytical method development, identity verification, and laboratory evaluation. Products are not intended for human or animal consumption, therapeutic use, clinical use, diagnostic use, dietary supplementation, dosing, injection, ingestion, or administration of any kind.
- Research materials
- 28Explore the current catalog
- Batch reports
- COAView published laboratory documents
- Shipping cutoff
- 1:30 PM CTSee the current shipping policy
- Support
- +1 512 555 0148Most messages get a reply the same business day.
What we stand for
Four things we don’t bend on.
Tested by others, not us
Every lot goes to an independent US laboratory with no stake in our products. We don’t grade our own work.
Lot documentation
Purity, identity and content for every lot, current and archived, searchable by the lot number on your label.
Research use, nothing else
We supply qualified laboratories and researchers only. We do not provide usage, preparation or administration guidance, and we decline orders that are not for laboratory research.
Real people, same day
A US team answers the phone and the inbox. Most messages get a reply the same business day.
Published COAs
Check the COA before you order.
Review available lot-specific Certificates of Analysis for the laboratory, test methods and reported results. Match the lot number on your label to the report; cap color alone does not identify a batch.
- HPLC-verified purity Consult the lot report for the measured purity and test method.
- Independent US labs Tested by third parties, not in-house.
- Matched to your lot Batch numbers trace each result to the vial you receive.
From lot to lab
How a vial reaches you.
Every product follows the same path, and nothing skips a step.
A lot arrives
Each production lot gets its own lot number, printed on every vial.
Independent testing
Review the lot-specific laboratory report for the tests performed, measured results and acceptance criteria.
Certificate published
The results go into the COA library, with a photo of the tested vial.
Packed and shipped
Orders placed by 1:30 PM CT ship the same day, with tracking and shipment protection.
Research use only
For the laboratory. Nothing else.
Offline Peptides supplies analytical-grade biochemical reference standards and laboratory research materials to qualified research customers. Materials are intended exclusively for in-vitro research, analytical method development, identity verification, and laboratory evaluation. Products are not intended for human or animal consumption, therapeutic use, clinical use, diagnostic use, dietary supplementation, dosing, injection, ingestion, or administration of any kind.
- Materials are not for human or animal consumption, therapeutic, clinical, diagnostic or cosmetic use, dietary supplementation, dosing, injection, ingestion or administration.
- Product information describes chemical identity and analytical documentation, without health, cosmetic or performance claims.
- Human or animal use, personal use and resale for those purposes are prohibited.
- Each product is supported by lot-level documentation, including Certificate of Analysis access where available. A COA does not establish suitability for human or animal use.
- We do not provide dosing, preparation, administration or treatment guidance.
- Buyers must confirm qualified laboratory use and are responsible for professional handling, storage and disposal under applicable requirements.