Nick Jefferson
Founder, Calibre Labs LLC
After twelve years in the research chemical industry, I founded Pure Peptides in 2026 to fill a gap I saw clearly: a supplier built around independent verification, not volume.
About Pure Peptides
Research-grade peptides. Verified before it ships. Every time.
Pure Peptides supplies US-based researchers with independently tested, HPLC-verified peptide compounds. Every vial is third-party confirmed before dispatch. Purity doesn't start in your lab. It starts in ours.
US-stocked. Independently verified. Third-party tested.
- Third-party tested
- >99% purity guaranteed
- Next business day dispatch
- Batch-specific COA
- Cold-chain included
- No bulking agents
Who we are
A US-domestic peptide supplier built on one rule: if it hasn't been independently verified, it doesn't ship.
Founded in 2026, Pure Peptides was built around a single, non-negotiable standard: every compound we ship must carry a batch-specific Certificate of Analysis produced by an independent, accredited laboratory. We do not conduct in-house purity or identity testing — all analytical results, including net content, are produced by an independent laboratory. Warehouse QC is limited to gravimetric fill checks against the certificate. Removing the conflict of interest from the analytical process is the most important quality decision we make.
We maintain domestic US stock of more than 75 peptide compounds, from growth hormone secretagogues and tissue repair peptides to metabolic and immune modulators. Every compound in the catalog has a corresponding batch record, an independent HPLC purity result, and a mass spectrometry identity confirmation on file before a single vial is dispatched.
We operate as a focused specialist supplier, not a mass-market distributor. Orders are handled by a small team that understands research procurement requirements. When you contact us about a batch number, a COA discrepancy, or a compound specification, you speak directly to someone who can answer the question.
Our team
The people behind Pure Peptides
Dr. Martina Rossi, PhD
Scientific Reviewer
Dr. Rossi independently reviews the research content on every product page for scientific accuracy.
Dr. Tharindunee Jayakody, PhD
Scientific Reviewer
Dr. Jayakody is a molecular pharmacologist with over 15 years of experience translating peptide and pharmacology research into clear, evidence-based content.
Education authors
Each Education article is written by a named scientist, who checks its claims against the sources listed under it and approves the text before it is published.
Read the Education articles How we write and review our content
Dr. Sufia Ul Haque
Education Author
PhD in chemistry, Aligarh Muslim University
Dr. Sufia Ul Haque is a chemist and scientific writer. She holds a PhD in chemistry from Aligarh Muslim University and carried out postdoctoral research in organic and natural-product synthesis in the United States, where her work included multistep synthesis, purification and chromatography. She has published in journals including Biosensors and Bioelectronics, the Journal of Power Sources and Scientific Reports, and reviews for several international journals. She writes about chemistry for readers without a scientific background.
Julia Piccoli, PhD
Education Author
PhD in Biotechnology
Dr. Julia Piccoli is the Associate R&D Director for Latin America at Kemin Industries in Brazil, where she leads innovation and technical strategy initiatives across the animal nutrition market. She holds a bachelor's degree in chemistry and earned both her M.Sc. and Ph.D. in Biotechnology. With more than 14 years of experience in academia and industry, her work has focused on peptides, biotechnology, food preservation, enzymes, and applied innovation for both pharmaceutical and animal nutrition. Julia collaborates closely with commercial, regulatory, and technical teams to translate scientific research into practical solutions that create value for customers and the industry.
How we operate
What sets our compounds apart
Independent testing, no exceptions
Every batch is submitted to an independent, accredited third-party laboratory for HPLC purity analysis and mass spectrometry identity confirmation before any order is dispatched. We do not conduct in-house purity or identity testing — all analytical results, including net content, are produced by an independent laboratory. Warehouse QC is limited to gravimetric fill checks against the certificate. Eliminating the conflict of interest from the analytical process is the most consequential quality decision we make. It is not negotiable.
Full batch traceability on every order
Each compound carries a unique lot number that runs continuously from supplier batch receipt through to the COA and the printed vial label. You can cross-reference the exact analytical run that produced the purity figure on your certificate. Batch-specific COAs are linked directly from each product page, and searchable by order number in our COA database.
Cold-chain from our warehouse to your door
Lyophilized peptides are stored under controlled conditions at our US warehouse and packed with validated thermal insulation and cold packs for every shipment, at no additional charge. Our packaging maintains a stable temperature window for a minimum of 48 hours under standard US domestic transit conditions.
Stated quantity is actual peptide content
We do not add mannitol or any other bulking agent to our peptides. Some suppliers use bulking agents to improve the visual appearance of the lyophilized cake. The effect is a reduction in actual peptide content relative to the label weight. Every vial we receive is gravimetrically verified during warehouse quality control. What the label states is what the vial contains.
Our process
From batch to your door
- 01
Sourcing
Compounds are sourced from accredited synthesis partners to a >99% purity specification. Each batch is assigned a unique lot number on receipt at our US warehouse.
- 02
Independent lab testing
Every batch is submitted to an accredited, independent third-party laboratory for HPLC purity analysis and MS-UPLC molecular identity confirmation. We do not conduct in-house purity or identity testing — all analytical results, including net content, are produced by an independent laboratory. Warehouse QC is limited to gravimetric fill checks against the certificate.
- 03
COA issued
A batch-specific Certificate of Analysis is produced from the third-party laboratory results and linked directly to your order, viewable and downloadable at any time from the product page or by searching our COA database with your lot number.
- 04
Cold-chain packing
Each order is packed with validated thermal insulation and cold packs before dispatch, at no additional cost. Packaging maintains a stable temperature window for a minimum of 48 hours under standard US domestic transit conditions.
- 05
Same-Day Dispatch
Orders confirmed before 12pm EST ship the same business day; orders after 12pm EST ship the next business day. Monday to Friday.
Why researchers choose us
More than just a supplier
Verified purity and full documentation are the baseline. Here is what we deliver on top of that.
- Fast domestic dispatch from US stockAll stock is held within the United States. Your order ships domestically and does not depend on a foreign shipping window. Consistent US stock means your research timeline stays on schedule.
- Discreet, unmarked packagingAll orders ship in plain outer packaging with no product names, compound identifiers, company branding, or return address details visible on the exterior. Interior documentation is similarly discreet.
- Next business day dispatchOrders confirmed before 12pm EST ship the same business day; orders after 12pm EST ship the next business day. Monday to Friday. Tracked delivery and signature-required options are available at checkout for all order sizes.
- Direct, knowledgeable supportAll order and research enquiries are handled by a small in-house team. We do not use automated ticketing queues. If you have a question about a batch number, a COA figure, or a compound specification, you will receive a direct answer within one to two business days.
- Trusted by research institutionsWe have supplied academic institutions, independent research labs, and verified research procurement teams across the United States. Our documentation standards meet the requirements of institutional purchasing workflows.
- Single-compound supply onlyWe supply individual, single-compound peptides exclusively. Blended or pre-mixed formulations cannot be independently verified for the accurate gravimetric contribution of each component. Reliable quality assurance requires compounds to be sourced and tested individually.
Research use only
All compounds supplied by Pure Peptides are strictly for in-vitro laboratory research. They are not licensed medicines and are not approved for human or veterinary use by the FDA or any other regulatory authority. By purchasing, you confirm that you are acquiring compounds for legitimate scientific research purposes only.