Peptide Sciences has shut down: what its notice says, and what to check before you choose another supplier

What peptidesciences.com says now#

The Peptide Sciences homepage no longer sells anything. As of October 29, 2026 it carries a single notice: "Peptide Sciences voluntarily discontinued all research-use-only product sales in March 2026."^[1] Closure trackers date the notice to March 6, 2026.^[2][3]

The rest of the notice is about impersonation. It states that the website remains under the company's control, and that Peptide Sciences "has not authorized any third party to sell research-use-only products on its behalf, operate a replacement website, represent itself as a successor to its research-product business, or claim affiliation with or endorsement by Peptide Sciences." It asks anyone who sees impersonation to report it to service@peptidesciencesmail.com.^[1]

The notice gives no reason for the decision and says nothing about open orders or refunds. We are not going to guess at either. If the site changes, this page will be updated with what it says and the date we saw it.

If you had an open order or a question about a past one#

Only Peptide Sciences can see its orders. Nobody outside the company can check, change or refund them, and neither can we. The only contact route the notice gives is the address above.^[1] Keep your order confirmation and payment receipt, and if you paid by card, your bank's dispute process is the other route; dispute rules and time limits differ by bank and by payment method.

If you relied on Certificates of Analysis that were hosted on peptidesciences.com, they are no longer published there. Any you saved are a record of what you received; a report posted elsewhere that claims to be one of theirs should be checked with the laboratory that issued it, as described in our guide to verifying a COA is genuine.

Part of a pattern#

Peptide Sciences was not the only closure. Our vendor-closure timeline lists six between June 2025 and October 2026, from vendors of very different sizes, most recently Soma Chems. Each one was followed by the same scramble: forum threads full of single-line vendor names, affiliate "alternatives" pages and look-alike domains. The most useful response is a checklist you can run yourself on any supplier, not a recommendation.

What to check before you choose any supplier, including us#

1. A named laboratory. The certificate names the laboratory that ran the test, and you can find that laboratory independently. "Third-party tested" with no laboratory name is a slogan, not a record.
2. A lot number on the vial that matches the certificate. One certificate per lot. A single certificate shown for every size and every batch is a copy, not a record.
3. A report you can confirm with the laboratory. Some laboratories let you look a report up by number. Where they do not, the vendor should say so.
4. Identity and quantity, not only purity. A purity percentage by HPLC does not confirm that the peptide is the one on the label (that takes mass spectrometry) or how much is in the vial. Our guide to reading a certificate of analysis explains each field.
5. A written refund or replacement policy that does not depend on how you paid.
6. A way to reach a person, with a stated response window.
7. A legal entity, city and address published on the website.
8. Payment with recourse where possible. Card payments can be disputed; most person-to-person transfers, gift cards and cryptocurrency cannot.
9. No successor claims. A site that says it is a closed vendor's replacement, honors its codes or holds its stock is unverified until the closed vendor's own domain confirms it. In Peptide Sciences' case, its domain says the opposite.^[1]

What to do next#

• Read the full vetting guide and the dated closure timeline.
• Check the COA library for the lot status of anything you are considering.
• Browse the catalog: every product can be reserved with no payment today.
• How pre-orders work: when we email you, how payment is requested, and how to cancel.