Buy research peptides from a vendor that will show you the batch-specific certificate of analysis for the lot it would ship, before you pay. That single request separates operations that hold documentation from ones that produce something on request, and it is the check every other check on this page supports. Aegis Bio ships lyophilised research peptides from the United States with a certificate available per lot.
Key facts
- Ask for the certificate for the specific lot that would ship — not a sample document and not a generic specification sheet.
- Research peptides should arrive as lyophilised powder with an intact seal and a lot number you can match against the paperwork.
- A domestic vendor ships in days and carries no customs exposure for the buyer.
- Research-use-only terms, a real contact channel and an absence of health claims are all signals about how an operation is run.
- Aegis Bio ships from the US at $20 for single vials and $45 once a kit is included, with certificates available per lot.
How to get peptides for research work
There are three realistic routes. A large catalog house sells characterised reagents with full documentation at a price that reflects it. A specialist research-peptide supplier sells a narrower catalog at a lower price with documentation per lot. A marketplace reseller sells whatever it can source, often without knowing the lot history at all. The checklist below is how you tell which of the three you are looking at, whatever the site says about itself.
The seven-point vendor checklist
- A batch-specific certificate from a named laboratory. Not a sample certificate, not one for a previous lot. If the answer is a generic specification sheet, that is the answer.
- A chromatogram, not just a number. A purity figure with no trace behind it cannot be checked, and the trace is where you see whether the remaining percent is one related impurity or general degradation.
- Peptide content stated. The figure that decides how much peptide you actually receive. Its absence leaves your mass arithmetic carrying an unknown error of typically 10 to 25 percent.
- Lyophilised powder and lot numbers. Dry material tolerates ambient transit; a lot number is what makes the certificate usable once the package arrives.
- Domestic shipping with a stated rate. A US-held stock ships in days. A flat rate published up front is also a rate you can put into a cost-per-milligram comparison.
- Clear research-use-only terms. Stated plainly, applied at checkout, and consistent with how the catalog is written.
- A real contact channel and no medical claims. Someone who answers a documentation question with a figure rather than reassurance, and a catalog that describes molecules rather than outcomes.
Where a vendor directory or a laboratory-testing project publishes independent analysis of a lot, that is a useful cross-check on a supplier’s own paperwork. Customer review platforms are not; they measure delivery experience, not what is in the vial.
How Aegis Bio answers each point
| Check | Aegis Bio |
|---|---|
| Batch-specific certificate | Available by request for the batch shipped, covering HPLC purity and mass-spectrometry identity. See the certificate library. |
| Physical form | Lyophilised powder, sealed vials, reconstituted by the laboratory. |
| Lot traceability | Catalog identifier, specification and fulfillment lot stay distinct through the order workflow — see quality and documentation. |
| Domestic shipping | Ships from the United States. $20 for a cart of single vials and bacteriostatic water; $45 standard or $80 expedited once a kit is included. |
| Research-use terms | Confirmed at the site gate and again at checkout. The policy is on the compliance page. |
| Contact channel | WhatsApp and Discord, both linked from the contact page. |
| Claims | None. Compound pages carry molecular weights, purity specifications, storage conditions and cost per milligram, and nothing else. |
The 2026 vendor landscape
The number of research-peptide suppliers serving the United States fell noticeably through 2026. Peptide Sciences, one of the larger US vendors, closed in March 2026 according to industry reporting, and several smaller catalogs consolidated or stopped taking orders over the same period. The practical consequence for a buyer is that a supplier list assembled a year ago is unlikely to still be accurate, and that the checklist above matters more than a remembered name. This is a factual note about market structure and is not a comment on any vendor’s materials.
What Aegis Bio stocks
Lyophilised research peptides in single vials and 10-vial kits. Frequently requested entries: Retatrutide from $25 for a 10 mg single vial, Tirzepatide, BPC-157 from $37, GHK-Cu, TB-500 and bacteriostatic water for reconstitution. Live reductions are on the sale page, ordering and payment are answered on the FAQ, and what is collected at checkout is described in the privacy policy. A side-by-side attribute comparison is in Aegis Bio compared with other peptide vendors.
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All materials are supplied for in-vitro laboratory research use only and are not for human or veterinary use. Nothing here is a therapeutic claim.