Skip to main contentOnward Aminos is a US-based supplier of research-grade peptides with 99%+ purity, third-party COAs, and HPLC verification on every order. For researchers replacing PurchasePeptides.com — which went dark in 2026 with no announcement we could locate — the operative difference is documentation discipline: a batch-specific Certificate of Analysis with every order, in your hands, independent of anyone's web portal.
Why is PurchasePeptides gone?
PurchasePeptides.com stopped resolving in 2026. We could locate no closure notice, announcement, enforcement action, or company statement tied to the shutdown as of August 24, 2026; the domain no longer resolves at all. The site had been known for low pricing within the category, and we located no refund or pending-order guidance after it went dark.
The full account is in our article on what happened to PurchasePeptides. Amino Axiom also maintains a sourced editorial record at aminoaxiom.com/vendor-status/purchasepeptides. Disclosure: Amino Axiom is part of the same brand network as Onward Aminos, and this article recommends our own store.
What should researchers require from a replacement supplier?
A vendor that can disappear overnight without a trace is a vendor whose documentation you needed to hold in your own files all along. Qualification criteria, in priority order:
- Batch-specific, third-party COA with every order. Not a generic document, not on request. Tied to the lot you received, issued by a named independent lab.
- A traceable purity figure. 99%+ backed by a chromatogram, not a marketing page. HPLC purity testing, explained covers how the number is produced and how to read it.
- Purity matched to the work. Different research applications carry different purity requirements; purity grades by application maps which grade answers which use case.
- Documentation that outlives the vendor. Download and file every COA on arrival. COA recordkeeping covers the discipline; PurchasePeptides' exit is the argument for it.
- Stability and handling practice. Lyophilization and peptide stability and cold-chain shipping cover what a supplier's handling standards should look like.
