About Steadfast Research Group
Steadfast by name, consistent by design — a US supplier of research-grade peptides for laboratory use, built so every batch can be documented, verified, and repeated.
Steadfast Research Group is a United States supplier of research-grade peptides for laboratory research use only. Every batch is independently tested by HPLC for purity and mass spectrometry for identity, with a Certificate of Analysis available for every batch. Our purpose is simple: advance scientific research by providing reliable, accurately tested research peptides that a scientist can document and reproduce.
Why "Steadfast"
Researchers do not need more marketing. They need consistency they can document and repeat. We chose the name Steadfast because it is the bar we hold ourselves to: research-grade products, steadfast customer service, and clear educational resources, on every order, without exception. Our vision is bigger than a catalog — to become the most trusted research peptide company in America, measured by the one thing that matters to a lab: whether the material is what the label says it is.
How we verify every batch
Trust in a research peptide comes from evidence, not claims. Steadfast Research Group documents each batch at three levels:
- Purity, measured. Every batch is produced through vetted manufacturing partners, with purity quantified by reversed-phase HPLC rather than asserted.
- Identity, confirmed. Mass spectrometry verifies that the peptide's molecular mass matches the target sequence, so identity is proven, not assumed.
- Independent proof. Testing is performed by third-party laboratories, and a batch-specific Certificate of Analysis is available for every batch and matched to the lot number on your vial.
New to reading a certificate? See our guide on how to read a peptide Certificate of Analysis and our explainer on HPLC peptide purity testing.
Careful handling and fulfillment
Verification does not end at the certificate. Temperature-sensitive materials are held in cold storage and shipped with protective packaging to preserve stability in transit. Orders ship within the United States in plain, unbranded packaging with tracking, and our support team answers questions about batches, certificates, and storage. For details, see our Shipping Policy and peptide storage guide.
Our commitment: for research use only
Steadfast Research Group sells strictly for in-vitro laboratory research. Our products are not drugs, not supplements, and not for human or animal consumption. We will not overstate what our products are, and we will not sell anything we cannot document. If a batch does not meet the standard, it does not ship.
Frequently asked questions
What is Steadfast Research Group?
A United States supplier of research-grade peptides for laboratory research use only. Every batch is independently tested by HPLC and mass spectrometry, with a Certificate of Analysis available for every batch.
Are your peptides third-party tested?
Yes. Each batch is verified by independent laboratories using HPLC for purity and mass spectrometry for identity, and a batch-specific Certificate of Analysis is matched to the lot number on your vial.
What does "for research use only" mean?
All products are sold strictly for in-vitro laboratory research. They are not drugs, not supplements, and not for human or animal consumption. By ordering, you confirm you are a qualified researcher.
Where do you ship?
Within the United States, processed in 1 to 2 business days and delivered in 2 to 5 business days via USPS or UPS with tracking and discreet packaging. See the Shipping Policy.
Evaluating suppliers, or just getting started? Read our guide on how to evaluate a research peptide supplier, browse our research peptides, or get in touch.